resolution specification

November 13, 2003 COS Preship Review 1Resolution Specification

• Definition of resolution– In all cases the resolution is

defined as , where is the FWHM of an emission line measured in pixels multiplied by the dispersion determined during wavelength calibration.

– The FWHM of the line is determined by collapsing the line the cross dispersion direction and fitting a gaussian to the line profile.

127

A B C D E F G H I J K L M N O4.2.2-1 Delta Lambda

MeasurementCEI

The width (delta lambda) shall be measured in the COS science data after extracting a one-dimensional spetrum from the two-dimensional raw data, and after applying appropriate reduction and calibration algorithms (excluding deconvolution or other resoluti

Sys A t 2/03 Test, COS Sys T/V Calibration w/ RAS/Cal, Plan, XXXX, ?/XX/02. Report?

BATC Delta Lambda Measurement, Test in T/V using RAS/Cal (external sources). Note: Int cal sources not intended for lamda/delta lambda measurement.

COS Calibration, Appendix B Tests 1100, 1110, 1120, 1150, 1160, 1170, 1180 & 1190.

1

November 13, 2003 COS Preship Review 2

24

A B C D E F G H I J K L M N OTable 4-1-e G130M Performance C

EI

Medium resolution spectroscopy, R>20000, FUV Channel, G130M Performance: 1150A to 1450A, R>20000

Comp A t 9/14/99

8/14/00

Cal & Qual, COS G130M FUV Grating, Plan, CU COS-01-0002, AV-01, 9/14/99.Test, grating performance in T/V , COS G130M-B Grating Cal & Qual, Results, CU COS-03-0002.

CU COS G130M Grating S/N: G130M-B.

Note: Gratings verif info (for all gratings), contact CU/E. Wilkinson, COS Instrument Scientist, 303 492-6817. AI: Closed, CU/E. Wilkinson, gathered grating verif doc (paper only) & mailed to KM.

1 1 - -

G130 Resolution

• FUV resolution measured as part of Test 1110• Qualitatively speaking, those lines with very low or

very high spectral resolution tend to have few counts. Bright lines generally exceed spectral resolution requirements.


25

A B C D E F G H I J K L M N OTable 4-1-f G160M Performance C

EI

Medium resolution spectroscopy, R>20000, FUV Channel, G160M Performance: 1405A to 1774A, R>20000

Comp A t 1/4/01

2/10/03

Cal & Qual, COS G160M FUV Grating, Plan, CU COS-01-0005, AV-01, 1/4/01.Test, grating performance in T/V, COS G160M-A Grating Cal & Qual, Results, CU COS-03-0072. *

CU COS G160M Grating S/N: G160M-A.* Grating Cal & Qual test didn't cover full speced bandwidth (1405-1774A), only covered 1470-1734A. Per test results review & talk w/ E. Wilkinson, req verified: Projection of eff. curve (CU COS-03-0070, Fig 9, pg 16) to sp

1 1 - -

G160 Resolution

• FUV resolution measured as part of Test 1110

November 13, 2003 COS Preship Review 4G140 Resolution

• FUV resolution measured as part of Test 1110

26

A B C D E F G H I J K L M N OTable 4-1-g G140L Performance C

EI

Low resolution spectroscopy, FUV Channel, G140L Performance: 1230A to 2050A, R>2000

Comp A t 1/4/01

12/20/00

Cal & Qual, COS G140L FUV Grating, Plan, CU COS-01-0004, AV-01, 1/4/01.Test, grating performance in T/V, COS G140L-B Grating Cal & Qual, Results, CU COS-03-0070.

CU COS G140L Grating S/N: G140L-B. 1 1 - -

November 13, 2003 COS Preship Review 5NUV Wavelength Coverage

• Individual wavelength settings for the NUV channel cover non-contiguous parts of the full NUV spectrum.

• Multiple grating settings are required to sample the full wavelength coverage of each NUV grating.

Point of note


G185M at N2, Height more than 50 counts, and FWHM less than 1 sigma average FWHM

11000

13000

15000

17000

19000

21000

23000

25000

1670 1720 1770 1820 1870 1920 1970 2020 2070 2120

Wavelength (A)

Resolution

lam1786lam1817lam1835lam1850lam1864lam1882lam1900lam1913lam1921lam1941lam1953lam1971lam1986lam2010

G185M Resolution

• G185M resolution– Measured during Appendix B, Tests

1160 & 1155– Initial results from Test 1160 found

lower than expected resolution. This was attributed to misalignment between RAS/Cal & COS

– Resolution tests repeated in GN2 environment during Test 1155 at ambient thermal environment existed.

– Resolution meets specifications over measured band-pass. Shorter wavelengths could not be observed in GN2 environment.

– G185M band-pass is from 1670-2127Å. 80% of this band-pass is 1760-2127.

Symbols refer to OSM2 wavelength settingsMultiple settings are required to cover entire band-pass

31

A B C D E F G H I J K L M N OTable 4-1-ae G185M Performance C

EI

Medium resolution spectroscopy, R>20000, NUV Channel, G185M Performance: 1700A to 2000A, R>20000 [conflict w/ Tables 4-2 and 4-4]

Comp A t 8/6/02

2/25/02

Characterization, NUV Gratings, Plan, P-442-3066, 8/6/02 (see note in Table 4-1-af comments).Test, grating performance in T/V, COS NUV Gratings, Results, CU COS-11-0038, 2/25/02.

CU/GSFC

COS G185M Grating S/N: G225M-B (flying G225M grating for NUV G185M channel due to inadequate G185M grating test performance).

Waiver Required: Spectral resolution req of R>20000 not met, actual is R>16000, deemed acceptable.

COS Calibration, Appendix B

1 1

80%

?


17000

18000

19000

20000

21000

22000

23000

24000

25000

26000

27000

28000

29000

30000

2070 2170 2270 2370 2470 2570

lam2186lam2217lam2233lam2250lam2268lam2283lam2306lam2325lam2339lam2357lam2373lam2390lam2410

• G225M resolution– Measured during Appendix B, Tests

1170 & 1156

– Initial results from Test 1170 found lower than expected resolution. This was attributed to misalignment between RAS/Cal & COS

– Resolution tests repeated in GN2 environment during Test 1156 at ambient thermal environment existed.

– Resolution meets specifications

G225M Resolution

Symbols refer to OSM2 wavelength settingsMultiple settings are required to cover entire band-pass

32

A B C D E F G H I J K L M N OTable 4-1-af G225M Performance C

EI

Medium resolution spectroscopy, R>20000, NUV Channel, G225M Performance: 2000A to 2500A, R>20000

Comp A t 2/25/02 Test, grating performance in T/V, COS NUV Gratings, Results, CU COS-11-0038, 2/25/02. Resolution info?

CU/GSFC

COS G225M Grating S/N: G225M-F. 0.05" scratch discovered on this grating 10/02, no impact on efficiency [CU/E. Wilkinson, 10/31/02].

Note on NUV Gratings Characterization Plan, P-442-3066, 8/6/02: Refed in CU COS-11-0038. CU/E. Wilkinson said should be r

1 ?


19000

21000

23000

25000

27000

29000

31000

33000

35000

2470 2570 2670 2770 2870 2970 3070 3170

lam2617lam2637lam2657lam2676lam2695lam2709lam2719lam2739lam2850lam2952lam2979lam2996lam3018lam3035lam3057lam3074lam3094

• G285M resolution– Measured during Test 1180

– Resolution meets specifications

G285M Resolution

Symbols refer to OSM2 wavelength settingsMultiple settings are required to cover entire bandp-pass

33

A B C D E F G H I J K L M N OTable 4-1-ag G285M Performance C

EI

Medium resolution spectroscopy, R>20000, NUV Channel, G285M Performance: 2500A to 3200A, R>20000


CU/GSFC

COS G285M Grating S/N: G285M-D.

COS Calibration, Appendix B Tests 1180.

1 ?


G230 at vacuum, Height more than 50 counts, and FWHM less than 1 sigma average FWHM

0

500

1000

1500

2000

2500

3000

3500

4000

1918 2118 2318 2518 2718 2918 3118 3318 3518

Wavelength (A)

Resolution

lam2635lm2950lam3000lam3360

• G230L resolution– Measured during test 1190

– Resolution meets specifications over most of the band-pass

– Band-pass is 1700-3200Å. 80% is 2000-3200Å.

G230L Resolution

34

A B C D E F G H I J K L M N OTable 4-1-ah G230L Performance C

EI

Low resolution spectroscopy, NUV Channel, G230L Performance : 1700A to 3200A, R>1700


CU/GSFC

COS G230L Grating S/N: G230L-A.


1 ?

80%


81

82

83

A B C D E F G H I J K L M N OTable 4-3-a XDL Wavelength

Range (A)CEI

XDL [FUV Channel], Wavelength Range (A) : 1150 to 2050 (ref Tables 4-1 and 4-2)

Comp A t Final FUV Detector Performance Report to be released [CU/E. Wilkinson, 7/9/02].

E. Wilkinson 9/11/2003: Document still under development.

1

Table 4-3-b XDL Quantum Efficiency

CEI

XDL [FUV Channel], Quantum Efficiency : 0.25 at 1300A Comp A t 1

Table 4-3-c XDL Visible Light Rejection

CEI

XDL [FUV Channel], Visible Light Rejection : QE < 10E-6 at 4000A Comp A t 1

1/11/00

?/XX/0X

Test, COS FUV Det. Perf., Plan, UCB COS-UCB-006, 1/11/00.Test, Detector Performance, Report, ?/XX/0X.

CU/UCB

• FUV02 meets QE specifications (UCB memo COS-021217-JV).

• Visible light rejection is 1x10-12 and 4x10-11

(ref. UCB memo COS-031027-JBM).

• Absolute efficiency measurements are based on a calibrated photodiode, so the absolute error ~10%.

FUV Detector Requirements

0

0.1

0.2

0.3

0.4

0.5

0.6

1100 1200 1300 1400 1500 1600 1700 1800

QE Seg. A - New Photocathode

December Calibration

Requirements

QE calibration 12/2002

QE

Wavelength

0

0.1

0.2

0.3

0.4

0.5

0.6

1100 1200 1300 1400 1500 1600 1700 1800

QE Seg. B - New Photocathode

December Calibration

Requirements

QE Calibration 12/2002

QE

Wavelength


86

87

88

89

A B C D E F G H I J K L M N OTable 4-3-f XDL Digitized Pixel

Size (dispersion)CEI

XDL [FUV Channel], Digitized Pixel Size (dispersion) : < 8 um Comp A t Verif by test at UCB assessing conversion range of time to amplitude converter & delay constant of anode delaylines.


1

Table 4-3-g XDL Digitized Pixel Size (cross-dispersion)

CEI

XDL [FUV Channel], Digitized Pixel Size (cross-dispersion) : < 15 um Comp A t Waiver Required: Not meeting req.

9/9/2003 - CCR 5039 Waiver in process. New Value < 25 um


1 1

Table 4-3-h XDL Spatial Resolution (dispersion)

CEI

XDL [FUV Channel], Spatial Resolution (dispersion) : no greater than 25 um [at over 80% of active area, CU/E. Wilkinson, 7/9/02]

Comp A t 1

Table 4-3-I XDL Spatial Resolution (cross-dispersion)

CEI

XDL [FUV Channel], Spatial Resolution (cross-dispersion) : no greater than 50um over 80% of active area

Comp A t 1

CU/UCB

?/XX/0X Test, Detector Performance, Report, ?/XX/0X.

• Digitized pixel size is described in UCB memo COS-031027-JBM. Pixel sizes in final data are 6x24 microns.

• Dispersion and cross-dispersion resolution are shown to the right and discussed in UCB memo COS-031027-JBM.

• Detector x-resolution for segment A does impact net spectral resolution.


1

2

A B C D E F G H I J K L M N O

R RV

WR

WC

ResultsComments / Notes(Key and Notes in separate Worksheet )

Resp. Org. / Site

Verif. Date

Verification Description / Document

Level TypeMethod

STE-63Para. #

COS CEI Spec.

Parameter

Source

Paragraph Title and Requirement Statement Waiver

01020304050

0 5000 1 104 1.5 104

FUV02 B Segment, HV = 150

X FWHMX FWHM (µm)

X Centroid (pixel)

25 µm Specification

2025303540455055

0 5000 1 104 1.5 104

FUV02 B Segment, HV = 150

Y FWHMY FWHM (µm)

X Centroid (pixel)


01020304050

0 5000 1 104 1.5 104

FUV02 A Segment, HV = 153

X FWHMX FWHM (µm)

X Centroid (pixel)


0102030405060

0 5000 1 104 1.5 104

FUV02 A Segment, HV = 153

Y FWHMY FWHM (µm)

X Centroid (pixel)



91

92

93

94

95

A B C D E F G H I J K L M N OTable 4-3-k XDL Dark Count Rate C

EI

XDL [FUV Channel], Dark Count Rate : <0.5 cts/cm2 sec at I&T Comp A t Verif by test at UCB by operating detector at full gain in photon counting mode & accumulating an exposure w/o any illumination.

E. Wilkinson 9/11/2003: Document still under development.COS Calibration, Appendix B Tests 2740.

1

Table 4-3-l XDL Flat Field Uniformity

CEI

XDL [FUV Channel], Flat Field Uniformity : +/- 20% RMS Sys A t Verif by test at detector vendor & test in vac chamber using RAS/Cal (external sources) & Internal Cal Sources.

E. Wilkinson 9/11/2003: Document still under development.COS Calibration, Appendix B Tests 1700, 1710, 1720, 1730 & 1740.

1

Table 4-3-m XDL Flat Field Stability CEI

XDL [FUV Channel], Flat Field Stability : support S/N = 100 spectroscopy Sys A t Verif by test at UCB & test in vac chamber using RAS/Cal (external sources) & Internal Cal Sources.

E. Wilkinson 9/11/2003: Document still under development.COS Calibration, Appendix B Tests 1700, 1710, 1720, 1730, 1740, 2120, 3000.COS Calibration, Ap

1

Table 4-3-n XDL Max Global Count Rate

CEI

XDL [FUV Channel], Max Global Count Rate *: 40000 cts/sec each segment* Note: Spec refers to detector alone, and may be demonstrated using non-flight ground support electronics. The max rate at instrument level will be lower, and will be limited by signa

Comp A t Measure input vs output count rate characteristics for each detector segment.

E. Wilkinson 9/11/2003: Document still under development. Was verfied at component level testing at UCB.

1

Table 4-3-o XDL Max Local Count Rate

CEI

XDL [FUV Channel], Max Local Count Rate : 10 cts/pore/sec Comp A t Measure output rate & pulse height distribution using test mask.Waiver Required: Not meeting req.

9/9/2003 - CCR 5039 Waiver in process. New Value = 5


1 1

?/XX/0X CU/UCB

Test, Detector Performance, Report, ?/XX/0X.

• XDL dark rate measured during to be ~0.425 counts/sec/cm2 (UCB memo COS-031027-JBM), exceeding the 0.5 counts/sec/cm2 specification.

• XDL maximum global and local rate discussed in UCB memos COS-031027-JBM, COS-010807-JV, and COS-010404-JVV. Requirements are met.



• Evaluation of the FUV flat field is progressing. The histograms to the right show the distribution of pixel-to-pixel variations in the p-flats for segment A & B. (FUV detector meets flat field uniformity specification)

• Stability of the flat field with charge extraction is under investigation. Quick look analysis showed no appreciable difference in the PHD after the deep flat fields were acquired. This is an ongoing investigation.


FUV Flat Field Data

November 13, 2003 COS Preship Review 14FUV Detector Requirements

• Specification listed in CEI corresponds to <100%/C/cm2, the rate of change of the modal gain with charge extraction, assuming the DRM.

• FUV02 MCPs were scrubbed to <100%/C/cm2, so they meet the specification.

• Results and test description can be found in UCB memos COS-031027-JBM and COS-991208-JV.

96

A B C D E F G H I J K L M N OTable 4-3-p XDL Lifetime C

EI

XDL [FUV Channel], Lifetime: lifetime = charge extraction for <5% change in QE

Comp CA

it

- Tracked in 5.1.2. - Perform life-test of flight microchannel plates by proxy using different plates processed from same boule in same fashion as flight MCPs.


1

November 13, 2003 COS Preship Review 15FUV Detector Requirements

• Results presented in UCB memos COS-031027-JBM and UCB-COS-RPT-1164 Rev A.

• Focal plane matching meets requirements.FUV02 MCP Measured Z - Ideal Z [mm]

y = -1.81E-04x - 3.21E-02

-0.10

-0.08

-0.06

-0.04

-0.02

0.00

0.02

0.04

0.06

0.08

0.10

-100 -80 -60 -40 -20 0 20 40 60 80 100

X - X0 [mm]

Measure Z - Ideal Z [mm]

Y = -4.5 mm

Y = 0.00 mm

Y = +4.5 mm

Average

Linear(Average)

97

A B C D E F G H I J K L M N OTable 4-3-q XDL Focal Plane Match C

EI

XDL [FUV Channel], Focal Plane Match : +/- 100 um Comp A t ?/XX/0X Test, Detector Performance, Report, ?/XX/0X.

CU/UCB

COS FUV Detector Geometric Distortion Maps, CU COS-11-0039, ?/XX/02 [to be released for signature 7/1/02, fr MSR 6/02 (6/26/02), BATC pres pg 6].


1

November 13, 2003 COS Preship Review 16NUV Detector Requirements

• Results from Test 2170– O2 absorption spectrum– Final spectrum consists of multiple individual spectra that

were cross-correlated and co-added.– Individual spectra consisted of multiple FP-Split exposures– Data were flat fielded as well.– SN in the continuum exceeds 100.

106

107

108

109

110

A B C D E F G H I J K L M N OTable 4-3-ai MAMA Dark Count

RateCEI

MAMA [NUV Channel], Dark Count Rate : 4x10E-6 cts/pixel/sec at I&T Comp A t 1 1 - -

Table 4-3-aj MAMA Flat Field Uniformity

CEI

MAMA [NUV Channel], Flat Field Uniformity : +/- 6% RMS Sys A t 1 1 - -

Table 4-3-ak MAMA Flat Field Stability

CEI

MAMA [NUV Channel], Flat Field Stability : support S/N = 100 spectroscopy Sys A t 1 ?

Table 4-3-al MAMA Max Global Count Rate

CEI

MAMA [NUV Channel], Max Global Count Rate * : 300000 cts/sec* Note: See note in Table 4-3-n.

Comp A t 1 1 - -

Table 4-3-am MAMA Max Local Count Rate

CEI

MAMA [NUV Channel], Max Local Count Rate : 210 cts/pixel/sec Comp A t 1 1 - -

6/3/98 Test, Det. Perf. (from STIS Pgm), COS NUV MAMA Subsys., Report, BATC SER COS-NUV-001, 6/3/98.

Obs in cal plan to demonstrate [12/11].

CU/BATC


• Per COS-NUV-001, the lifetime requirement placed on the NUV detector when it was built is “10% DQE loss at >8x1010 counts/mm2”.

– This specification corresponds to 5x107 counts/pixel– The NUV channel uses 3 stripes, each 3x1024 pixels = 9216 total pixels– This means that the NUV detector will suffer a 10% loss in DQE when it has observed 4.6x1011

events TOTAL in the 3 spectral stripes.– The DRM (COS ISR 99-01) states that the NUV channel can expect to see 1.4x109 counts over the

lifetime of the mission.– This is 2 orders of magnitude below the value at which the NUV detector will experience a 10% loss

of DQE.– Finally, the three spectral stripes for each channel do not fall on the same region of the detector, thus

increasing the number of pixels used and decreasing the net counts/pixel.– It is reasonable to assume that the NUV lifetime will support the lifetime requirements.

• The re-entrant window in the NUV channel was polished to </4 at 6328Å as stated in the certification logs.

– The re-entrant window defines the focal surface of the detector. /4 = 158 nm << 0.1 mm, thus the NUV detector focal plane meets requirements.

NUV Detector Requirements

111

112

A B C D E F G H I J K L M N OTable 4-3-an MAMA Lifetime C

EI

MAMA [NUV Channel], Lifetime: lifetime = charge extraction for <5% change in QE

Comp CA

it

- Tracked in 5.1.2. - Perform life-test of flight microchannel plates by proxy using different plates processed from same boule in same fashion as flight MCPs.

9/19/03, Contact Vick Argabright (STIS Guy). Refer to SER SYS-031, Page 3

1

Table 4-3-ao MAMA Focal Plane Match

CEI

MAMA [NUV Channel], Focal Plane Match: +/- 100 um Comp A t 6/3/98 Test, Det. Perf. (from STIS Pgm), COS NUV MAMA Subsys., Report, BATC SER COS-NUV-001, 6/3/98.

CU/BATC

Can't find info in report [KM]. Spec is on flatness of det & det installation [BATC/D. Ebbets, 12/11/02]. AI: Open, D. Ebbets, 12/11/02, org of req?, verif?

9/19/03, Contact Vick Argabright (STIS Guy)

1


• GSFC IVT verified the alignment of CAOS and RAS/Cal prior to each major alignment or test activity.

• No reports describing the alignment have been issued by the IVT at this time.

Optical Stimulus Requirements

114

115

A B C D E F G H I J K L M N O4.2-1 HST input C

EI

This performance shall be met during normal operations of the COS when provided with light from the HST in accordance with the optical parameters of ST-ICD-02.

Sys C t 1

4.2-2 Verification CEI

These requirements shall be verified to the maximum extent possible during pre-launch system level tests on the ground.

Sys C t 1

Tests, w/ CAOS/HOMS * and RAS/Cal * at selected wavelengths, ?/XX/XX. Reports?

Report on the Installation, Alignment and Testing of the COS Aberrated Optical Stimulus (CAOS) at Ball Aerospace (HST-IVT-001/002)Wait for 1 more report

BATC &

GSFC

2/20035/2003

* CAOS/HOMS & RAS/Cal independently verified (mechanical alignment, optical alignment, & optical calibration) by GSFC Optical IVT (Independent Verif Team, Opto-Mechanical Verif):- IVT cmped RAS/Cal optical & chief ray alignment & ABA verif 10/02, for

November 13, 2003 COS Preship Review 19COS Wavelength Coverage

118

119

A B C D E F G H I J K L M N O4.2.1-1 Wavelength Range C

EI

COS shall be capable of observing astronomical targets in ultraviolet light with wavelengths between 1150 and 3200A [ref Tables 4-1, 4-2, and 4-3].

Sys A t Test in vac chamber using RAS/Cal (external sources) & internal Cal sources.


1

4.2.1-2 Configurations CEI

All wavelengths within this range shall be accessible using an allowed combination of detector, optical element and mechanical configuration.

Sys A t Insp sys-level test doc to ensure allowable instrument configs allow access to specified wavelength range.


1

2/03 Test, COS Sys T/V Calibration w/ RAS/Cal, Plan, XXXX, ?/XX/02. Report?

BATC

November 13, 2003 COS Preship Review 20COS Wavelength Coverage

FUV

NUV

COS wavelength scales extend across required wavelengths

November 13, 2003 COS Preship Review 21Accuracy Requirement - NUV

122

A B C D E F G H I J K L M N O4.2.1-5 Accuracy/Repeatability C

EI

The precision and repeatability of the instrument configuration shall be capable of placing a specified central wavelength within +/- 50 spectral elements of the actual central pixel of the detector.

Sys A t 2/03 Test, COS Sys T/V Calibration w/ RAS/Cal & int cal system, Plan, XXXX, ?/XX/02. Report?

BATC Accuracy/Repeatability.

COS Calibration, Appendix B Test 850.

1

0

2

4

6

8

10

12

14

16

18

<-15 -15 to -10 -10 to -5 -5 to 0 0 to 5 5 to 10 10 to 15 >15

Observed - Requested Wavelength (resels)

Number of cases

G185M G225M G285M

CEI requirement is +/- 50 resels

NUV Accuracy• Data from wavecals that

accompanied external Pt-Ne tests 1160, 1170, 1180.

• The measured stripe B central wavelength was within …– ± 5 resels 68%– ± 10 resels 88%– ± 15 resels 100%.

November 13, 2003 COS Preship Review 22Repeatability Requirement - NUV

01 1 1 1

0

11

45

15

3

6

0 0

8

00

5

10

15

20

25

30

35

40

45

50

>-6 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 >6

Offset (resels)

number of cases differentOSM1position

CEI requirement is +/- 50 resels

92 cases of repeated visits tosame wavelength setup

includes all 4 NUV gratings

•Comparison of repeated visits to same setup position. 107 spectra in 14 groups (grating, setup , FPSPLIT). Cross-correlation using 1 spectrum as reference. 3 stripes averaged. Assume 1 resel = 3 NUV pixels.•Repeatability is

•± 1 resel 77% of cases•± 6 resels 100%.

NUV Repeatability

November 13, 2003 COS Preship Review 23Accuracy Requirement - UFV

•5 supported OSM1 setup positions

•Each allows 4 FPSPLIT offsets of 1 mechanism step each

•Measured wavelengths are within required range

1270 1280 1290 1300 1310 1320 1330

Wavelength at center of gap

nominal wavelength +/- 50 resels

G130MAppendix B calibrations

setup = 1309-2-10+1

FUV Accuracy

November 13, 2003 COS Preship Review 24Repeatability Requirement - FUV

0

1 1 1

4 4 4

9

1

5

2 2

1 1

00

1

2

3

4

5

6

7

8

9

10

>-6 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 >6

Offset (resels)

number of cases

36 casesall 3 FUV gratingsaverage = -0.5 reselsaverage = -0.1 pixels

CEI requirement = +/- 50 resels

FUV Repeatability

• Comparison of repeated visits to same setup position. 47 spectra in 11 groups (grating, setup , FPSPLIT). Cross-correlation using 1 spectrum as reference. Seg A & B averaged. Assume 1 resel = 6 FUV pixels.

• Repeatability is…– ± 1 resel 39% of

cases– ± 6 resels 100%.

November 13, 2003 COS Preship Review 25850 Repeatability Test

Test # 850 was developed and run as a repeatability monitor

NUV exposuresG185M =1850 2c Line medium

225 G M =2250 2c Line medium285 G M =2850 2c Line medium230 G L =3000 , 2c FPSPLIT Line medium

1 2NUV TA Line low 1 1NUV TA BRT Line low

185 G M =1850 1c Flat high

FUV exposures140 G L =1230 , 2c FPSPLIT Line medium130 G M =1309 2c Line medium160 G M =1600 2c Line medium160 G M =1600 1c Seg B Flat low130 G M =1309 2c Seg A Flat medium

results summarized on following slides

850 Repeatability monitor #1 Thur 10/09/03850 Repeatability Monitor #2 Mon 10/13/03850 Repeatability monitor #3 Wed 10/15/03850 Repeatability monitor 4 Thur 10/16/03

Test was run four times during Appendix B phase.

The same exposures are included in the System Functional Test, and will be obtained each time the FT is run.


FUV, G160M, Seg B wavecal

centroids 1 ~4 pixels FWHM 1 ~0.4 pixelsbrightness 1 ~ 2%Analysis by Scott Friedman


NUV, G185M, Stripe B wavecal

centroids 1 ~3.5 pixels FWHM 1 ~0.2 pixelsbrightness 1 ~ 3%Analysis by Scott Friedman

November 13, 2003 COS Preship Review 28Wavelength Scale Requirements

123

124

125

A B C D E F G H I J K L M N O4.2.1-6 Accuracy (R=20000

mode)CEI

Wavelengths assigned to data points in the fully reduced and calibrated COS spectra shall have an accuracy equivalent to an absolute uncertainty of less than +/- 15 km/sec in the R=20000 mode,

Sys A t Accuracy (R=20000 mode).

COS Calibration, Appendix B Tests 50, 1290, 1295, 1410, 1420, 1430, 1440, 1450, 1460 & 1470.

1

4.2.1-7 Accuracy (G140L) CEI

+/- 150 km/sec in mode G140L and Sys A t Accuracy (G140L).


1

4.2.1-8 Accuracy (G230L) CEI

+/- 175 km/sec in mode G230L Sys A t Accuracy (G230L).


1

Test, COS Sys T/V Calibration w/ RAS/Cal & int cal system, Plan, XXXX, ?/XX/02. Report?

BATC2/03

• This requirement addresses two issues

– That the residuals in the wavelength calibration are << 15 km/s

– That applying the wavelength calibration as determined from the wavelength calibration spectrum with an appropriate offset in the a0 term of the wavelength solution to the science spectrum does not introduce error greater than 15 km/sec in the absolute wavelength scale (1 resolution element).

– 1 NUV pixel = ~4 km/sec

• Residuals in wavelength scale meet requirements.

G285 - C Stripe, cen=2850Å

November 13, 2003 COS Preship Review 29FUV Wavelength Scale Residuals

• Residuals are <3 FUV pixels (~6 km/sec)

rms=1.2 pixels

rms=0.8 pixels

November 13, 2003 COS Preship Review 30Errors in offset wavelength calibration

•Applying an internal (WCA) wavelength solution to external (PSA) data (45 lines) yields an average error of…

-0.26 ± 1.12 pixels, or -0.04 ± 0.19 spectral resels.


135

136

137

138

A B C D E F G H I J K L M N OTable 4-4-a Wavelength Range (A) C

EI

- Tracked in Table 4-1-e. - 1 1 - -

Table 4-4-b Minimum Lambda/Delta Lambda

CEI

G130M [FUV Channel], Minimum Lambda/Delta Lambda : 20000 [shall exceed this number (ref Table 4-1) for at least 80% of wavelength range indicated in Table 4-2, req from 4.2.2-2]

Sys A d

t

1 1 - -

Table 4-4-c Peak Cts/ph CEI

G130M [FUV Channel], Peak Cts/ph : 0.103 (must be exceeded at some wavelength in the G130M range)

Sys A dt

Will be verified in Calibration Test #1210 & #1240

COS Calibration, Appendix B Tests 1200 & 1210.

1

Table 4-4-d Min Cts/ph CEI

G130M [FUV Channel], Min Cts/ph : 0.058 (must be exceeded at all G130M wavelengths)

Sys A t Will be verified in Calibration Test #1210 & #1240.


1

4/26-27/00

2/03

G130M [FUV Channel], Wavelength Range (A) : 1150 to 1450 (ref Tables 4-1 and 4-2)

Min Lambda/Delta Lambda & Peak Cts/ph, Design, COS CDR Pkg, Optical Sys, pgs 13 & 15.


CU/BATC

BATC

G130M Efficiency

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

1100 1200 1300 1400 1500

Angstroms

/cts photonCEI minimum

CEI peak

component model

130G M Appendix B measurements

• Efficiency measured at more than 5 wavelengths for all FUV and NUV channels.

• Appendix A test 400, July 05• Appendix B test 1210, Oct 11

187

A B C D E F G H I J K L M N O4.2.4-2 Sensitivity

Measurements, Spectral Mode Wavelength Selection

CEI

During the laboratory testing the sensitivity shall be measured at, as a minimum, five wavelengths within the nominal range of each mode. These wavelengths shall be selected to sample the expected minima or maxima, and near the short and long wavelength e


BATC Sensitivity Measurements, Spectral Mode Wavelength Selection: Insp test procs that assess sensitivity. Ensure that sensitivity measured at a min of five wavelengths within the specified wavelength range of each mode.

COS Calibration, Appendix B Tests 121

1

November 13, 2003 COS Preship Review 32G160M Efficiency

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

1400 1500 1600 1700 1800

Angstroms

/cts photon

CEI minimum

CEI peak

component model

160G M Appendix B measurements

Appendix A test 400, July 05Appendix B test 1220, Oct 11

143

144

145

146

A B C D E F G H I J K L M N OTable 4-4-aa Wavelength Range (A) C

EI

- Tracked in Table 4-1-f. - 1 1 - -

Table 4-4-ab Minimum Lambda/Delta Lambda

CEI

G160M [FUV Channel], Minimum Lambda/Delta Lambda : 20000 [shall exceed this number (ref Table 4-1) for at least 80% of wavelength range indicated in Table 4-2, req from 4.2.2-2]

Sys A d

t

1 1 - -

Table 4-4-ac Peak Cts/ph CEI

G160M [FUV Channel], Peak Cts/ph : 0.077 (must be exceeded at some wavelength in the G160M range)

Sys A dt

Will be verified in Calibration Test #1220 & #1240.


1

Table 4-4-ad Min Cts/ph CEI

G160M [FUV Channel], Min Cts/ph : 0.02 (must be exceeded at all G160M wavelengths)

Sys A t Will be verified in Calibration Test #1220 & #1240.


1

G160M [FUV Channel], Wavelength Range (A) : 1405 to 1774 (ref Tables 4-1 and 4-2)

CU/BATC

BATC

4/26-27/00

2/03



November 13, 2003 COS Preship Review 33G140L Efficiency

0

0.02

0.04

0.06

0.08

0.1

0.12

1200 1300 1400 1500 1600 1700 1800 1900 2000

Angstroms

/cts photon

CEI minimum

CEI peak

component model

G140L Appendix B measurements

Appendix A test 400, July 05Appendix B test 1230, Oct 11

149

150

151

152

A B C D E F G H I J K L M N OTable 4-4-ba Wavelength Range (A) C

EI

- Tracked in Table 4-1-g. - 1 1 - -

Table 4-4-bb Minimum Lambda/Delta Lambda

CEI

G140L [FUV Channel], Minimum Lambda/Delta Lambda : 2000 [shall exceed this number (ref Table 4-1) for at least 80% of wavelength range indicated in Table 4-2, req from 4.2.2-2]

Sys A d

t

1 1 - -

Table 4-4-bc Peak Cts/ph CEI

G140L [FUV Channel], Peak Cts/ph : 0.07 (must be exceeded at some wavelength in the G140L range)

Sys A dt

Will be verified in Calibration Test #1230.


1

Table 4-4-bd Min Cts/ph CEI

G140L [FUV Channel], Min Cts/ph : 0.009 (must be exceeded at all G140L wavelengths)

Sys A t Will be verified in Calibration Test #1230.


1

4/26-27/00

2/03



CU/BATC

BATC

G140L [FUV Channel], Wavelength Range (A) : 1230 to 1800 2050 (ref Tables 4-1 and 4-2) [corrects conflict w/ Tables 4-1 and 4-2]

1

2


R RV

WR

WC


Resp. Org. / Site

Verif. Date


Level TypeMethod

STE-63Para. #

COS CEI Spec.

Parameter

Source


This point falls outside the specified wavelength range and thus does not violate requirements.


G185M Throughput

0.000

0.005

0.010

0.015

0.020

0.025

0.030

0.035

0.040

0.045

1700 1750 1800 1850 1900 1950 2000 2050 2100 2150

Wavelength Angstroms

cts/photon

proposed CEI minimum

proposed CEI peak

Appendix A dataAppendix B data

model using grating measurement

•Appendix A test 450, July 03•Appendix B test 1250, Sept 22•Appendix B test 1255, Sept 24

•Note: The new CEI values for the NUV channels are values that have been submitted as a change request, NOT a waiver. These new values were rederived after an over-sight made early in the development of COS was discovered. Basically, when the NUV channel was broken into three channels from two the CEI values were copied not rederived. No prior knowledge of the as-built component efficiencies was assumed. 6 of 8 of the values actually increased compared to current values in CEI.

155

156

157

158

A B C D E F G H I J K L M N OTable 4-4-ca Wavelength Range (A) C

EI

- Tracked in Table 4-1-ae. - 1 0 Y -

Table 4-4-cb Minimum Lambda/Delta Lambda

CEI

G185M [NUV Channel], Minimum Lambda/Delta Lambda : 20000 [shall exceed this number (ref Table 4-1) for at least 80% of wavelength range indicated in Table 4-2, req from 4.2.2-2]

Sys A d

t

1 1 - -

Table 4-4-cc Peak Cts/ph CEI

G185M [NUV Channel], Peak Cts/ph : 0.023 (must be exceeded at some wavelength in the G185M range)

Sys A dt

COS Calibration, Appendix B Test 1250 1

Table 4-4-cd Min Cts/ph CEI

G185M [NUV Channel], Min Cts/ph: 0.01 (must be exceeded at all G185M wavelengths)

Sys A t COS Calibration, Appendix B Test 1250 1

CU/BATC

BATC

4/26-27/00

2/03



G185M [NUV Channel], Wavelength Range (A) : 1750 to 2000 (ref Tables 4-1 and 4-2) [conflict w/ Table 4-1]


G225M Throughput

0.000

0.005

0.010

0.015

0.020

0.025

0.030

0.035

0.040

1950 2000 2050 2100 2150 2200 2250 2300 2350 2400 2450 2500 2550


cts/photon


proposed CEI peak


G185M data

model using grating measurement

• Appendix A test 450, July 03• Appendix A test 450, July 05• Appendix B test 1260, Sept 21• Appendix B test 1255, Sept 24• The procedure for monitoring

the stability of the G225M grating is written and is being routed for signatures (COS-05-0004).

• Note that G185M channel can be used to observe the short wavelength portion of the G225M band-pass with higher efficiency.

161

162

163

164

A B C D E F G H I J K L M N OTable 4-4-da Wavelength Range (A) C

EI

- Tracked in Table 4-1-af. - 1 ? - -

Table 4-4-db Minimum Lambda/Delta Lambda

CEI


Sys A d

t

1 1 - -

Table 4-4-dc Peak Cts/ph CEI


Sys A dt


Table 4-4-dd Min Cts/ph CEI

G225M [NUV Channel], Min Cts/ph : 0.001 (must be exceeded at all G225M wavelengths)


4/26-27/00

2/03



CU/BATC

BATC

G225M [NUV Channel], Wavelength Range (A) : 2000 to 2500 (ref Tables 4-1 and 4-2)


G285M Throughput

0.000

0.005

0.010

0.015

0.020

0.025

0.030

2400 2500 2600 2700 2800 2900 3000 3100 3200 3300


cts/photon


proposed CEI peak


model using grating measurements

Appendix A test 450, July 03Appendix A test 450, July 05Appendix B test 1270, Sept 21

169

170

171

172

A B C D E F G H I J K L M N OTable 4-4-ea Wavelength Range (A) C

EI

- Tracked in Table 4-1-ag. - 1 ? - -

Table 4-4-eb Minimum Lambda/Delta Lambda

CEI


Sys A d

t

1 1 - -

Table 4-4-ec Peak Cts/ph CEI


Sys A dt


Table 4-4-ed Min Cts/ph CEI

G285M [NUV Channel], Min Cts/ph: 0.001 (must be exceeded at all G285M wavelengths)


4/26-27/00

2/03

G285M [NUV Channel], Wavelength Range (A) : 2500 to 3200 (ref Tables 4-1 and 4-2)* Note: See note in Table 4-4-h.



CU/BATC

BATC

November 13, 2003 COS Preship Review 37G230L Efficiency

G230L Throughput

0.000

0.005

0.010

0.015

0.020

0.025

0.030

0.035

1600 1800 2000 2200 2400 2600 2800 3000 3200 3400


cts/photon


proposed CEI peak


model using grating measurements

Appendix A test 450, July 03Appendix B test 1280, Sept 22

176

177

178

A B C D E F G H I J K L M N OTable 4-4-fb Minimum Lambda/Delta

Lambda CEI

G230L [NUV Channel], Minimum Lambda/Delta Lambda : 1700 [shall exceed this number (ref Table 4-1) for at least 80% of wavelength range indicated in Table 4-2, req from 4.2.2-2]

Sys A d

t

1 1 - -

Table 4-4-fc Peak Cts/ph CEI

G230L [NUV Channel], Peak Cts/ph : 0.016 (must be exceeded at some wavelength in the G230L range)

Sys A dt


Table 4-4-fd Min Cts/ph CEI

G230L [NUV Channel], Min Cts/ph : 0.005 (must be exceeded at all G230L wavelengths)

Sys A t COS Calibration, Appendix B Test 1280

SER Addresses estimation at 3200A at 0.001, See pdf page 2, G230L, row 51.

Possible Waiver.

1

4/26-27/00

2/03

9/16/2003



Current Estimates of COS Sensitivity, SER COS SYS-022, 4/11/2000

CU/BATC

BATC

1

2


R RV

WR

WC


Resp. Org. / Site

Verif. Date


Level TypeMethod

STE-63Para. #

COS CEI Spec.

Parameter

Source


November 13, 2003 COS Preship Review 38BOA Transmission

• BOA Transmission measured during Tests 3310, 3310A, and 3300.

• The BOA is ~ND2.5

• Meets requirements

204

A B C D E F G H I J K L M N OTable 4-5-ac BOA Application C

EI

BOA, Application: ... with factor 100 attenuation, used over the full wavelength ranges of all FUV and NUV modes.

Sys C i 4/26-27/00

?/XX/XX

Design, COS CDR Pkg, 4/26-27/00.Insp, GSFC Acceptance Review Pkg, ?/?/XX.

CU/BATC

Ensure BOA used for appropriate sys op modes: doced via SW Design Doc (DM-03) & exercised via Control SW per Cmd Dev Handbook (DM-05) & verif through exam of resultant SW Test Report (DM-08) op test data.

1 1 - -


• G185M – 2nd order band-pass lies completely below

1150Å Al/MgF2 cut-off

• G225M– No order sorter: 2nd order efficiency was

predicted to be very low due to low reflectivity of coatings [a]

– Only grating where 2nd order efficiency was measured

– 2nd order efficiency measured during test 1265.– G225M, = 1248 (no order sorter) detected in

m=2 with efficiency = 0.0004. = 2487 detected in m=1 with efficiency = 0.03. Ratio = 0.013.

• G285M & G230L – 2nd order measured, but not fully analyzed– G285M, G230L (with order sorters) did not

detect = 1248. Upper limit of efficiency = 1.2x10-5.

Out of Band Response

Channel Bandpass 2nd order Order sorter

G185M 1700-2127 850-1064 No

G225M 2070-2527 1035-1264 Noa

G285M 2480-3229 1240-1614 Yes

G230L 1700-3200 850-1600 Yes

TA1 1700-3200 NA Yes

TA1BRT 1700-3200 NA Nob

• TA1–FUV efficiency measured during test 1290.–Efficiencies were almost unmeasureable due to two passes through the order sorter

• TA1BRT–FUV efficiency measured during test 1295–Efficiencies higher than for TA1 due to 5% front surface reflectivity [b]

121

A B C D E F G H I J K L M N O4.2.1-4 Light Attenuation C

EI

Grating modes which are used in first order of diffraction whose nominal wavelength range is longer than lambda > 2300A shall include a provision for strongly attenuating light with wavelengths between 1150A and 1600A that may be present in the second ord


BATC Review design details to ensure light attenuation is accounted for. Review RAS/Cal data to ensure reqed light attenuation is implemented.

COS Calibration, Appendix B Tests 1100-1190 and 1260, 1270 & 1280 for efficiency.

1

November 13, 2003 COS Preship Review 40NUV Spatial Imaging

• NUV performance measured during Test 2250 and Test 150

10 pixels = 250 m

182

183

A B C D E F G H I J K L M N O4.2.3-1 Encircled Energy C

EI

The spectrum of a single point source centered in the Primary Science Aperture (PSA) shall contain 90% of the energy within a range of 300um or less in the direction perpendicular to dispersion.

Sys A t Encircled Energy.

9/16/2003 - SER OPT-017A May address. AI Cassidy, Get Document

1

4.2.3-2 Point Source Separation

CEI

COS shall be capable of producing separate and distinguishable spectra for two point sources whose separation in the aperture is greater than 1.0 arcsec in the direction perpendicular to dispersion.

Sys A t Point Source Separation.


1

?/XX/XX

?/XX/XX

Tests, all modes over all wavelengths listed in Table 4-4, w/ CAOS/HOMS, ?/XX/XX. Reports?Tests, all modes over all wavelengths listed in Table 4-4, COS Sys T/V Calibration w/ RAS/Cal, Plan, XXXX, ?/XX/02. Report?

BATC

BATC

November 13, 2003 COS Preship Review 41FUV Spatial Resolution

•G160M performance measured during Test 2731

•7x7 pinhole array•338 um (1”) spacing in spatial dimension•100 um in spectral dimension

10 pixels = 240 m

182

183

A B C D E F G H I J K L M N O4.2.3-1 Encircled Energy C

EI

The spectrum of a single point source centered in the Primary Science Aperture (PSA) shall contain 90% of the energy within a range of 300um or less in the direction perpendicular to dispersion.

Sys A t Encircled Energy.

9/16/2003 - SER OPT-017A May address. AI Cassidy, Get Document

1

4.2.3-2 Point Source Separation

CEI

COS shall be capable of producing separate and distinguishable spectra for two point sources whose separation in the aperture is greater than 1.0 arcsec in the direction perpendicular to dispersion.

Sys A t Point Source Separation.


1

?/XX/XX

?/XX/XX

Tests, all modes over all wavelengths listed in Table 4-4, w/ CAOS/HOMS, ?/XX/XX. Reports?Tests, all modes over all wavelengths listed in Table 4-4, COS Sys T/V Calibration w/ RAS/Cal, Plan, XXXX, ?/XX/02. Report?

BATC

BATC


154

A B C D E F G H I J K L M N OTable 4-4-bf SNR Measured C

EI

G140L [FUV Channel], G130M, SNR Measured * : >30* Note: See note in Table 4-4-h.

Sys A t 2/03 Test, COS Sys T/V Calibration w/ RAS/Cal & int cal system, Plan, XXXX, ?/?/02. Report?

BATC Measure detected counts using internal cal system & detector.

COS Calibration, Appendix B Tests 1700, 1710, 1720, 1730 & 1740.Refer to Tests 2120 & 3000.

1

147

148

A B C D E F G H I J K L M N OTable 4-4-ae SNR Photons I Covered in Table 4-4-af. - - - -

Table 4-4-af SNR Measured CEI

G160M [FUV Channel], SNR Measured * : >30* Note: See note in Table 4-4-h.

Sys A t 2/03 Test, COS Sys T/V Calibration w/ RAS/Cal & int cal system, Plan, ?, ?/?/02.


COS Calibration, Appendix B Tests 1700, 1710, 1720, 1730 & 1740.

1

G160M [FUV Channel], SNR Photons: 40

FUV Signal to Noise Requirements

• Data taken at the component level has been used to demonstrate the ability to achieve SN>100.• Data taken during Tests 1700 and 3000 (flat field spectra taken with onboard D2 lamps) and

Test 2120 (CO absorption spectra).– G130M used to derive flat field for FUV segment A– G160M used to derive flat field for FUV segment B– Absorption spectra sufficient to demonstrate SN~70. The test was cut short due to the detection of ~10% drop in the

flux from the onboard D2 lamps.– Can easily meet 30:1 requirement– Evaluation of component level flat field data suggests we can achieve 100:1– Analysis of data acquired during final calibration is ongoing.

140

141

142

A B C D E F G H I J K L M N OTable 4-4-f SNR Measured C

EI

G130M [FUV Channel], SNR Measured : >30 Sys A t 2/03 Test, COS Sys T/V Calibration w/ RAS/Cal & int cal system, Plan, XXXX, ?/XX/02. Report?


COS Calibration, Appendix B Tests 1700, 1710, 1720, 1730,1740.

1

Table 4-4-g SNR Photons (high signal)

I Covered in Table 4-4-h. - - - -

Table 4-4-h SNR Measured (high signal)

CEI

G130M [FUV Channel], SNR Measured (high signal) *: >100* Note: The requirement is that COS achieve S/N > 30 for routine science observations, using normal operational procedures, calibration reference files and data processing algotithms. This shall be d



COS Calibration, Appendix B Tests 2120 & 3000

1

G130M [FUV Channel], SNR Photons (high signal) : 135

189

A B C D E F G H I J K L M N O4.2.5-1 C

EI

The design of the spectrograph, its detectors and onboard calibration subsystem shall support the ability to achieve S/N =100 per spectral resolution element.Table 4-4 Note: S/N>100 may require special operational procedures (FP splits), additional calib

Sys A d 4/26-27/00 Design, COS CDR Pkg, Overview & Optical Sys, 4/26-27/00.

CU/BATC

9/16/2003 - SER CAL-008 Addresses Strategy. Section 7, Recommends COS Calibration Techniques.

1

November 13, 2003 COS Preship Review 43FUV Flat Field Data

• The achieved signal to noise under different assumptions• We are actively working on developing the p-flats necessary to increase the signal

to noise further.

November 13, 2003 COS Preship Review 44Component Level Results

•The next few slides summarizes a an analysis conducted for FUV02 based on component level flat fields that demonstrates we can expect to achieve SN 100:1.•The data set presented was taken prior to delivery of FUV02 and after the final scrub of the MCP stack was completed.

–~29 hours of data were taken, or about ~1x109 events/segment. All data was taken as event lists. 108 files were processed.–No special environmental conditions were imposed on the test, so the temperature of the detector and electronics varied several degrees during the data acquisition.–For this analysis the data were thermally corrected and then the data was divided into two halves (image 1 and image 2).–Image 1 was then divided by image 2 and the statistics of the residuals were analyzed to evaluate the stability and noise characteristics of the flat field images.–In addition, FPSPLITs observations - the nominal observing mode - was simulated by shifting and adding 4 copies the same spectrum. The residuals were then evaluated and an effective signal to noise computed.


Images of Segment A

• A portion of the two flat field images of segment A (7000<xpixel<9400).• Image 1 is divided into Image 2 to evaluate our ability to flat field segment A.

Imag

e 1

Imag

e 2

Component Level Results

November 13, 2003 COS Preship Review 46Component Level Testing

Flat Fielded Images for A

• This images is the result of dividing image 1 by image 2 for segment A.

Seg

men

t A

Note the lack of structure evident in the residuals.


Description of the Data Products

Histogram of the ratio of image 1 to image 2 for the full image between x pixels 7000 and 9400.

Histogram of the ratio of image 1 to image 2 for the spectral region.

Note: The fact that the two histograms are identical in width suggests that noise is identical for the full detector image and extracted region.

Histogram of the ratio of image 1 to image 2 for the spectral region per 6x12 pixel resolution element (RE). The width of the distribution is smaller because there are more counts per spectral bin compared to the counts per image bin.

Spectral region

Dispersion DirectionCro

ss-d

ispe

rsio

n D

irec

tion ~250 m high


Histogram of Flat Field - A

• Left is the histogram for the full detector. Right is the histogram for the spectral stripe only.

• Each plot is extracted from the divided image shown earlier.• The computed SN (45:1) is consistent with our expectations

based on the error analysis of dividing two images.• Conclusion: We are able to flat field the FUV data to the limit

of photon statistics.


Simulated FPSPLITS - A

• Effective photon limited SN ~ 126 per image.

• The measured SN~91 is consistent with the back of the envelope prediction of SN~89.

• The computed signal to noise is consistent with the gains expected by averaging 4 data sets.

• This indicates that the current plan for reducing the fixed pattern noise through standard FPSPLIT observations will work.

=+++


179

180

A B C D E F G H I J K L M N OTable 4-4-fe SNR Photons I Covered in Table 4-4-ff. - - - -

Table 4-4-ff SNR Measured CEI

G230L [NUV Channel], SNR Measured * : 30* Note: See note in Table 4-4-h.



COS Calibration, Appendix B Test 2500.Refer to Tests 2510, 2160 & 2170.

1

G230L [NUV Channel], SNR Photons: 40

173

174

A B C D E F G H I J K L M N OTable 4-4-ee SNR Photons I Covered in Table 4-4-ef. - - - -

Table 4-4-ef SNR Measured CEI

G285M [NUV Channel], SNR Measured * : >30* Note: See note in Table 4-4-h.




1

G285M [NUV Channel], SNR Photons : 40

165

166

167

168

A B C D E F G H I J K L M N OTable 4-4-de SNR Photons I Covered in Table 4-4-df. - - - -

Table 4-4-df SNR Measured CEI

G225M [NUV Channel], SNR Measured : >30 Sys A t 2/03 Test, COS Sys T/V Calibration w/ RAS/Cal & int cal system, Plan, XXXX, ?/XX/02. Report?



1

Table 4-4-dg SNR Photons (high signal)

I Covered in Table 4-4-dh. - - - -

Table 4-4-dh SNR Measured (high signal)

CEI

G225M [NUV Channel], SNR Measured (high signal) * : >100 Sys A t 2/03 Test, COS Sys T/V Calibration w/ RAS/Cal & int cal system, Plan, XXXX, ?/XX/02. Report?


COS Calibration, Appendix B Test 2510.Refer to Tests 2160 & 2170.

1

G225M [NUV Channel], SNR Photons: 40

G225M [NUV Channel], SNR Photons (high signal) : 135

159

160

A B C D E F G H I J K L M N OTable 4-4-ce SNR Photons I Covered in Table 4-4-cf. - - - -

Table 4-4-cf SNR Measured CEI

G185M [NUV Channel], SNR Measured * : >30* Note: See note in Table 4-4-h.

Sys A t 2/03 Test, COS Sys T/V Calibration w/ RAS/Cal & int cal system, Plan, ?, ?/?/02.



1

G185M [NUV Channel], SNR Photons: 40

NUV Signal to Noise Requirements

• All flat field data acquired using G185M mode.• NUV flat field data taken during Tests 1750, 2505, 1750 & 2506.• High quality O2 absorption spectra taken during Test 2170.

– Data from 2170 demonstrates SN>100.– Data acquired using G185M, cen=1817Å.

• Demonstration of SN>100:1 means that we can meet all 30:1 requirements.• All NUV SN requirements met.

189


EI



CU/BATC


1

November 13, 2003 COS Preship Review 51NUV Flat Field Data

• The achieved signal to noise under different assumptions. Bottom line is that we essentially achieve photon limited signal noise.

November 13, 2003 COS Preship Review 52NUV O2 Absorption Spectra


196

A B C D E F G H I J K L M N O4.2.6-4 Vignetting C

EI

… testing shall verify that no other source of vignetting obstructs the view of the sky.

Sys A t ?/XX/XX Tests, w/ CAOS/HOMS & RAS/Cal at selected wavelengths, XXXX, ?/XX/XX. Reports?

BATC &

GSFC

Vignetting, Use CAOS/HOMS & RAS/Cal testing to ensure that there are no other sources of vignetting.

AI Cassidy: 9/19/2003, Contact Tom Delker 303-939-4429, (BATC) for documentation.

1

Vignetting Requirement

• TA1 image of a fully illuminated aperture with a Kr lamp.

• 1”=42 pixels

• 167 pixels = 4”– This is extended field of

view as predicted by ray-trace modeling.

– Non-uniform illumination is a result of lamp filament or vignetting prior to PSA.

167 pix

November 13, 2003 COS Preship Review 54Scattered Light Requirement

• Residual intensity due to scattered light was measured during Tests 2160 and 2110

• Measured scattered light for G185M is ~0.5%• Measured scattered light for G130M, G160M, and G140L are all <1%

208

A B C D E F G H I J K L M N O4.2.7-3 Stray Light

Contribution, Residual Intensity Measurement

CEI

Diffused scattered light shall contribute no more that 2% residual intensity to the signal in the core of a saturated absorption line measured with any of the medium dispersion modes (GnnM) in the spectrum of a point source in the PSA.

The residual inten

Sys A t 2/03

?/XX/0X

Test, COS Sys T/V w/ RAS/Cal & absorption cell (darks?), ?/XX/XX, Report?Test, Enclosure Light Leak, ?/XX/XX, Report?

BATC

BATC or

GSFC?

Internal Stray Light Contribution [done as part of 1st test, 12/11, no more than 2%] .

Residual IntensityMeasurement: Review stray light portion of CAOS/HOMS / RAS/Cal test procs to ensure that residual intensity measured as reqed.

COS Calibration, Appen

1

November 13, 2003 COS Preship Review 55Drift/Jitter Requirements

Drift CorrectionFigure at the far left shows the x-centroid of an isolated FUV emission line over a 6000 second observation. The panel in the middle shows the corrected x-centroid. To do the correction the 6000 second observation was divided into 120 sec. Each sub-exposure was cross-correlated against the first sub-exposure and an offset computed. The time dependent offset was then applied to the data, thus correcting the drift to better than 0.7 pixels (0.12 resolution elements).

220221

222

223

A B C D E F G H I J K L M N O4.2.8-1 Jitter Requirement C

EI

Jitter may shall not contribute more than 0.25 resolution elements to the FWHM.

Sys A a

t

4/24/00

2/03

Analy, COS Summary of Wavefront Image Motion Error Budgets, BATC SER SYS-020, 4/24/00.Test, COS Sys TV w/ RAS/Cal, Plan, XXXX, ?/XX/02. Report?

BATC

BATC

BATC thinks not req [7/8/02]. KM disagrees, thinks a req. Sentence should use "shall" instead of "may."

Jitter Req: Stability of structure analyzed via model, confirmed via sine sweep & random vibe tests to estimate short-term stability.

1

4.2.8-2 Drift Definition I N/A, info for analyses & testing: Drift Definition. - - - -4.2.8-3 Drift Requirement C

EI

Drift may shall not exceed 1 resolution element per hour. Sys A t 2/03 Test, COS Sys T/V Orbit Temp Cycling w/ RAS/Cal at selected wavelengths, Plan, XXXX, ?/XX/02. Report?

BATC BATC thinks not req [7/8/02]. KM disagrees, thinks a req. Sentence should use "shall" instead of "may."

Drift Req: Thermal analy used to estimate image creep & positional stability for long term.


1

4.2.8-4 Drift Knowledge CEI

Knowledge of the drift shall be provided which allows it to be corrected with a residual uncertainty of not more than 0.25 resolution elements per hour.

Sys A d

t

4/26-27/00

2/03

PtNe lamps (see comments), Design, COS CDR Pkg, Sys Eng, pg 45, 4/26-27/00.Test, COS Sys T/V Orbit Temp Cycling w/ RAS/Cal, Plan, XXXX, ?/XX/02.

CU/BATC

BATC

Drift Knowledge: PtNe lamps allow monitoring of drift. Thermal analy used to estimate image creep & positional stability for long term.


1

Drift will be measured as a change in the location of a spectral feature due to the combined effects of mechanical vibrations, thermal deformations, physical movement of any component, temporal or thermal changes in the encoding of photon events into pixe

35 /s

November 13, 2003 COS Preship Review 56Measurement of Jitter

• Evaluation of Jitter– Jitter in the dispersion direction will

broaden an emission line and raise the mean, decreasing the spectral resolution.

– Using the data set shown on the previous slide, the width of a bright emission line was computed every 10 seconds.

– The computed FWHM is shown in the upper right. Note how the width is centered about 5.5 pixels.

– The figure in the lower right shows the distribution of the x FWHM with a 1 of 0.77 pixels. An FUV resolution element is ~6 pixels, so the measured 2 jitter for time scales > 10 seconds is about 0.25 resolution elements.

– The width of the resolution curve is likely dominated by statistical fluctuations, in which case the jitter is even smaller.

November 13, 2003 COS Preship Review 57NUV Imaging Capability - bandpass

TA1, TA1-BRT Throughputs

0.001

0.010

0.100

1400 1600 1800 2000 2200 2400 2600 2800 3000 3200


cts/photon


Light for TA1 passes through fused-silica order sorter twice. Throughput = 6x10-5 cts/ph at 1524, undetectable at 1248.

Light for TA1-BRT reflects off of front surface of fused silica. It is not attenuated by absorption. Throughput = 2x10-3 cts/ph at 1524, 8x10-4 at 1248.

229

230

A B C D E F G H I J K L M N O4.2.9-5 Spectral Content C

EI

The spectral content shall include the entire NUV band between 1700 and 3200A.


BATC Spectral Content, Verif by CAOS/HOMS & RAS/Cal at selected wavelengths that reqed capability exists.


1

4.2.9-6 Stray FUV Light in NUV Channel

CEI

FUV light shall be attenuated to minimize its contribution to the net signal. SubSys

Sys

A

A

t

t

2/03

2/03

Test, COS Sys T/V w/ RAS/Cal & absorption cell, Plan, XXXX, ?/XX/XX. Report?Test, COS Sys T/V Calibration w/ RAS/Cal, Plan, XXXX, ?/XX/XX. Report?

BATC COS Calibration, Appendix B Tests 1290 & 1295. 1


228

A B C D E F G H I J K L M N O4.2.9-4 Centroiding C

EI

It shall be possible to determine the location of a point source in the aperture with an accuracy of 0.1 arcsec after nominal centering by the target acquisition process.


BATC Centroiding, Verif by CAOS/HOMS & RAS/Cal at selected wavelengths that reqed location capability exists.


1

NUV Imaging Capability

• Data acquired during Appendix A, Test 150

• Spots are separated by ~42 pixels, exactly as predicted by ray-trace models.

• Target acquisition algorithms, software, and NUV optical design support knowledge of target location in the PSA to <0.1”

225

226

227

A B C D E F G H I J K L M N O4.2.9-1 Imaging Capability C

EI

The NUV channel of COS shall have the capability of producing an image of the sky in undispersed light as seen through the entrance aperture.

SubSys A d

t

4/26-27/00

?

?

Design, COS CDR Pkg, Optical Sys, pg 5, 4/26-27/00.

Test, w/ CAOS/HOMS, ?/?/XX. Report?

Test, COS Sys TV w/ RAS/Cal, Plan, ?, ?/XX/02.

CU/BATC

BATC

BATC

Imaging Capability, Design NUV channel to have imaging capability. Verif by CAOS/HOMS & RAS/Cal at selected wavelengths that image is produced.

COS Calibration, Appendix B Tests 50, 60, 1290, 1295 & 1410.

1

4.2.9-2 Field of View Size, Image Mode Purpose

I N/A, info: Field of View Size, Image Mode Purpose. - - - -

4.2.9-3 Spatial Resolution CEI

The image mode shall be capable of distinguishing two equally bright point sources separated by 1.0 arcsec in any direction.

Sys A t 2/03 Test, COS Sys T/V w/ RAS/Cal w/ 2 pinhole target, Plan, XXXX, ?/XX/02. Report?

BATC Spatial Resolution, Verif by CAOS/HOMS & RAS/Cal at selected wavelengths that reqed capability exists.

COS Calibration, Appendix A Test 150.AI Cassidy, 9/15/2003, Get Documentation.

1

The field of view of the image need not exceed that of the aperture being used. The purposes of the image mode are to assist with the initial alignment of the apertures in the HST coordinate system and to assist with target acquisitions.

42 pixels = 1.0”(280m at PSA)

November 13, 2003 COS Preship Review 59Target Acquisition

• Target Acquisition software includes 5 phases– Spiral search– Aperture location calibration– Image mode acquisition – Peakup in the cross-dispersion direction– Peakup in the dispersion direction

• Each phase of TA and associated parameters were tested during 11 tests in Appendix B.

Target Acquisition Issue 129012951410142014301433143514371440145014551460146514701475

Field of viewSensitivityDispersed light TAImage Mode TASpiral searchAperture calibrationImage mode peakupCross-dispersion peakupDispersion peakup

Flux-weighted centroidReturn to brightest pointMeanMedianLocal backgroundGlobal background

Tests run during Appendix B Phase

November 13, 2003 COS Preship Review 60Target Acquisition

• No software errors – code functions properly• Data needed to establish software parameters were obtained• All phases of TA were exercised• All algorithms were used, produced consistent results• All required hardware modes were used (and a few that are unlikely ie TA1 +

BOA)• All directions of slews as expected – sign conventions• All magnitudes within several pixels of expected

Test results have established confidence in the target acquisition capability


• Full reduction of the data products is proceeding with a target completion data of February 1, 2003. The data files and corresponding data products will be presented in AV-04.

189

190


EI



CU/BATC


1

4.2.5-2 CEI

Calibration procedures and data files shall be provided that quantify dark counts, scattered light and response non-uniformity as needed by the data procesing algorithms.

Sys A i 1Q/03 Insp, COS Sys T/V Calibration w/ RAS/Cal & int cal system, Plan, Procs, & data files, XXXX, ?/XX/02. KM review.

BATC/GSFC

Deliverables as stated in Data Reqs. Doc. (DRD). 1

November 13, 2003 COS Preship Review 62Exposure Time

1. Each detector produces time tag events consisting of a dispersion and cross dispersion direction. See COS-UCB-001 (FUV ICD) and COS-NUV-001 (NUV performance document).

2. See FUV ICD COS-UCB-001

3. See UCB memo COS-010807-JV

4. See BATC report COS-NUV-001

234

235

236

237

238

239

240241

242

243

244

245

246

A B C D E F G H I J K L M N O4.3.1-1 Event Contents C

EI

Each event shall contain, as a minimum, a dispersion direction coordinate and a cross-dispersion coordinate.

Sys C t 2/03 Test, COS Sys T/V w/ RAS/Cal, Plan, XXXX, ?/XX/XX. Report?

BATC Event Contents, ". 1

4.3.1-2 XDL Pulse Height Distribution

CEI

The XDL [FUV] detector shall also provide pulse-height distribution (PHD) information with each event.

Sys C t 2/03 Test, COS Sys T/V w/ RAS/Cal, Plan, XXXX, ?/XX/02. Report?

BATC XDL Pulse Height Distribution, ". 1

4.3.1-3 FUV Detector Event Rate Processing

CEI

- Tracked in Table 4-3-n. - FUV Detector Event Rate Processing, Measure input vs output count rate characteristics for each detector segment using flt electronics. Sys op modes are doced

1 0 - -

4.3.1-4 NUV Detector Event Rate Processing

CEI

- Tracked in Table 4-3-al. - NUV Detector Event Rate Processing 1 1 - -

4.3.1-5 Instrument Event Rate Processing

CEI

The COS instrument shall be capable of processing data at a rate of 250000 events/sec, full frame.

Sys C t 8/02 Test, MEB Temporary Integration, Report, BATC SER XXX-XXX, ?/XX/02.

BATC Instrument Event Rate ProcessingAI: Open, BATC/R. Higgins, 12/11/02, ask R. Brewster about.

AI Cassidy: Contact to get "As Run" procedure

1

4.3.1-6 Sys C t

4.3.1-7

4.3.1-84.3.1-9 Sys C t 2/03

4.3.1-10 Sys C t

4.3.1-11

4.3.1-12 Sys C t

4.3.1-13 Sys C t

The FUV detector shall be capable of processing photon events at a rate of at least 40000 events per second for each of the two segments.

The NUV detector shall be capable of recording photon events at a rate of at least 300000 events per second.

1

23

4

November 13, 2003 COS Preship Review 63Exposure Time

Item 1: Verified in COS CS DIB Component Test, section 8.6 (FSW Requirement. 5.11)

Items 2-7: Verified in COS CS DIB & DIB component test, section 8.3.

Item 4: Exposure times between 0.1 through to 6500 seconds all verified.

234

235

236

237

238

239

240241

242

243

244

245

246

A B C D E F G H I J K L M N O4.3.1-1 Sys C t 2/03

4.3.1-2 Sys C t 2/03

4.3.1-3 -

4.3.1-4 NUV Detector Event Rate Processing

CEI

- Tracked in Table 4-3-al. - NUV Detector Event Rate Processing 1 1 - -

4.3.1-5 Instrument Event Rate Processing

CEI

The COS instrument shall be capable of processing data at a rate of 250000 events/sec, full frame.

Sys C t 8/02 Test, MEB Temporary Integration, Report, BATC SER XXX-XXX, ?/XX/02.

BATC Instrument Event Rate ProcessingAI: Open, BATC/R. Higgins, 12/11/02, ask R. Brewster about.

AI Cassidy: Contact to get "As Run" procedure

1

4.3.1-6 Data Stream Contents CEI

The data stream shall contain information that allows a time of detection to be assigned to each photon event.

Sys C t Data Stream Contents, Detector readout processing. Doced via SW Design Doc (DM-03) &/or SI Science Data Format (DM-06) & exercised per Cmd Dev Handbook (DM-05) & verif through SW Test Report (DM-

1

4.3.1-7 Event Time Precision CEI

The precision of the time for events from either detector shall be 32 ms. Sys C t Event Time Precision 1

4.3.1-8 Multiple Events I N/A, info for design: Multiple Events. - - - -4.3.1-9 Minimum Integration

TimeCEI

COS shall be capable of providing a minimum integration time no greater than 1 second, and…


BATC Min Integration Time, Met by electronics & SW design. Implemented by design of macro cmds & timing patterns. Sys op modes are doced via SW Design Doc (DM-03) & exercised via control SW per Cmd Dev Handbook (DM-05) & are verif through exam of resultant SW

1

4.3.1-10 Maximum Exposure Time

CEI

… a minimum maximum exposure time of > 60 minutes. [changes for better language]

Sys C t Maximum Exposure Time, ". 1

4.3.1-11 Exposure Intervals CEI

The duration of an exposure shall be an integer multiple of 100 millisec. Sys C t Exposure Intervals, ". 1

4.3.1-12 Exposure Time Uncertainty

CEI

The exposure time uncertainty will be less than or equal to 1% of the commanded exposure time.

Sys C t Waiver Required: Not meeting req for shortest exposure times [CU/E. Wilkinson, 7/9/02].

1 1

4.3.1-13 Exposure Application CEI

These times shall apply to both detectors, and to both time-tagged and image accumulation modes.

Sys C t Exposure Application. 1

2/03 Test, FSW FQT, CSC?, Plan, BATC IN0090-106, DM-07, 3/29/00. Proc, BATC IN0090-307, DM-08, 2/23/03. Report, BATC IN0090-XXX, DM-08, ?/XX/03.

The NUV detector shall be capable of recording photon events at a rate of at least 300000 events per second.

BATC

It shall be permissible for multiple photon events which arrive in time closer than 32 milliseconds to have identical time values.

BATC

2/03 Test, FSW FQT, CSC?

1

2

3

4

56

7

8


263

264

A B C D E F G H I J K L M N O4.3.2-16 Optics/Detector

Wavelength Relationship, Spectroscopic Mode Applicability, Commanded Position Applicability, Registration Capability

CEI

It shall be possible, using only COS internal capabilities, to establish the relationships between commanded position of the optics select mechanism and the wavelength of light which occurs at the center of the detector format. This capability shall exist

Sys C d

t

4/26-27/00

2/03

Design, COS CDR Pkg, Optical Sys & COS Mech, 4/26-27/00.Test, COS Sys T/V Calibration*, Plan, XXXX, ?/XX/02. Report?

* Test performed w/ internal cal source (w/o using RAS/Cal) for all gratings. Data compared to test for all gratings w/ RAS/Cal using mo

CU/BATCBATC

Optics/Detector Wavelength Relationship, Verif by test using RAS/Cal in vac chamber with internal cal sys.

Spectroscopic Mode Applicability, Registration Capability, Commanded Position Applicability, Detector op modes exercised via control SW & verif thr

1

4.3.2-17 Sys C t 2/03

259

A B C D E F G H I J K L M N O4.3.2-12 Calibration System

ResponsivityCEI

The calibration process shall allow the relative response to be corrected with an RMS uncertainty of 3% or less, as measured with data points corresponding to spectral resolutin elements in the extracted net spectrum.

Sys C t 2/03 Test, COS Sys T/V Calibration (w/o using RAS/Cal), Plan, XXXX, ?/XX/02. Report?

BATC Calibration System Responsivity, Verif by test in vac chamber with internal cal sys.

COS Calibration, Appendix B Tests 1710-1740 & 2500.

1

252

253

254

A B C D E F G H I J K L M N O4.3.2-5 Lamp Spectum/Target

SpectrumCEI

The geometrical relationship between the source of the lamp spectrum and the spectrum of an astronomical target shall be defined and calibrated.

Sys C Lamp Spectum/Target Spectrum, Initially defined by analy. Verif by test using vac chamber w/ internal cal sys.


1

4.3.2-6 Spectral Resolution Element Calibration

CEI

The calibration process shall be capable of assigning wavelengths to every data point in a COS spectrum with an accuracy of 0.25 spectral resolution elements or better.

Sys C Spectral Resolution Element Calibration, Verif by test in vac chamber w/ internal cal sys.


1

4.3.2-7 Cal Lamp Spectrum CEI

COS shall contain redundant lamps whose spectra are suitable for measuring the small-scale "pixel to pixel" variations in the response of the instrument.

Sys C Cal Lamp Spectrum, Design Cal lamp states to provide cal lamp ops from Observe state. Insp dwgs to ensure redundancy. Ops doced via SW Design Doc (DM-03) &/or SI Science Data Format (DM-06) & exercised per Cmd Dev Handbook (DM-05) & verif through SW Test

1 1

4/26-27/00

2/03

Design, COS CDR Pkg, Overview, Optical Sys, & Operations, 4/26-27/00.Test, COS Sys T/V Calibration (w/o using RAS/Cal), Plan, XXXX, ?/XX/02. Report?

CU/BATC

BATC

d

t

248

249

A B C D E F G H I J K L M N O4.3.2-1 Cal Source C

EI

COS shall be able to produce performance and calibration data using only sources and capabilities which are internal to the instrument.

Sys C Cal Source, Exercise functional test proc for the cal sys, check presence of excitation source for all modes.

1 1 - -

4.3.2-2 Parallel Activity CEI

It shall be possible to obtain data from internal calibration sources as a parallel activity, while another SI is the prime observing instrument.

Sys C Parallel Activity, Detector op modes are exercised via control SW & verif through exam of resultant op test data. Doced via SW Design Doc (DM-03) & exercised per Cmd Dev Handbook (DM-05) & verif through SW Test Report (DM-08) data.

1

d

t

4/26-27/00

5/20/02

2/03

Design, COS CDR Pkg, Operations, 4/26-27/00.COS Calibration, Reqs & Procs, CU COS-01-0003B, AV-03B, 5/20/02.Test, COS Sys T/V Calibration (w/o using RAS/Cal), Plan, XXXX, ?/XX/02. Report?

CU/BATC

CU

BATC

Onboard Calibration

1. There is nothing in the design of COS that precludes this requirement. An external shutter optically isolates COS, so that calibration lamps can operate without compromising other SI operations.

2. Data shall be included in AV-04. The tests listed above were completed, so the data does exist.3. The wavelength solutions presented earlier demonstrate that we meet this requirement. Complete wavelength solutions shall

be included in AV-04. 4. The ability to correlate mechanism position versus wavelength is satisfied by the fact that the mechanism position is

reported in the COS telemetry.

5. Signal to noise data and efficiency data presented earlier demonstrates that this requirement is satisfied.

2

3

1

4

5

November 13, 2003 COS Preship Review 65Onboard Calibration

• This requirement is satisfied by the COS Target Acquisition SUDF and associated component level tests.

• The functionality of the target acquisition software was verified during Appendix B testing, Tests 1450, 1460, and 1470.

• Final data will be provided in AV-04.

263

264

A B C D E F G H I J K L M N O4.3.2-16 Optics/Detector

Wavelength Relationship, Spectroscopic Mode Applicability, Commanded Position Applicability, Registration Capability

CEI

It shall be possible, using only COS internal capabilities, to establish the relationships between commanded position of the optics select mechanism and the wavelength of light which occurs at the center of the detector format. This capability shall exist

Sys C d

t

4/26-27/00

2/03

Design, COS CDR Pkg, Optical Sys & COS Mech, 4/26-27/00.Test, COS Sys T/V Calibration*, Plan, XXXX, ?/XX/02. Report?

* Test performed w/ internal cal source (w/o using RAS/Cal) for all gratings. Data compared to test for all gratings w/ RAS/Cal using mo

CU/BATCBATC

Optics/Detector Wavelength Relationship, Verif by test using RAS/Cal in vac chamber with internal cal sys.

Spectroscopic Mode Applicability, Registration Capability, Commanded Position Applicability, Detector op modes exercised via control SW & verif thr

1

4.3.2-17 Target Acquisition, Commanded Position Applicability, Calibration Positioning Capability, Commanded Position Applicability

CEI

During the target acquisition process, it shall be possible to calibrate the location of the science aperture in detector pixel coordinates in order to compute a maneuver of HST needed to improve the centering of the target within the aperture. The measur


BATC Target Acquisition, Commanded Position Applicability, Calibration Positioning Capability, Commanded Position Applicability, Detector op modes exercised via control SW & verif through exam of resultant op test data. Doced via SW Design Doc (DM-03) & exerci

1


• The above plots show the accumulated flat field data and locations of the science stripes.

257

A B C D E F G H I J K L M N O4.3.2-10 Calibration Dispersed

SpectrumCEI

The dispersed spectrum of the calibration lamp shall illuminate the regions of the detector used by the spectrum of an astronomical target.

Sys C t 2/03 Test, COS Sys T/V Calibration (w/o using RAS/Cal), Plan, XXXX, ?/XX/02. Report?

BATC Calibration Dispersed Spectrum, Initially defined by analy. Verif by test in vac chamber w/ internal cal sys.


1

November 13, 2003 COS Preship Review 68Modes of Operation

267

268

269

270

271272

273

274

275

A B C D E F G H I J K L M N O4.3.3-1 Test Modes C

EI

1. Functional and diagnostic tests Sys C Test Modes, Confirm reqed detector op modes exercised via control SW & verif through exam of resultant op test data. Doced via SW Design Doc (DM-03) & exercised per Cmd Dev Handbook (DM-05) & verif through SW Test Report (DM-08) data.

1

4.3.3-2 Alignment/Focus Acitivities

CEI

2. Alignment and focusing activities Sys C Alignment/Focus Acitivities, ".NUV: See SER OAT-20, Section 8.3FUV: See SER OAT-20, Section 8.5

1

4.3.3-3 Target Acquisition CEI

3. Target acquisition using dispersed or undispersed light Sys C Target Acquisition, ". 1

4.3.3-4 Spectroscope Data Acquisition

CEI

4. Spectroscopic data acquisition Sys C Spectroscope Data Acquisition, ". 1

4.3.3-5 Calibration Data Acquisition

CEI

5. Calibration data acquisition Sys C Calibration Data Acquisition, ". 1

4.3.3-64.3.3-7

4.3.3-8

4.3.3-9 Sys C t

4/26-27/00

2/03

2/03

?/XX/0X

Design, COS CDR Pkg, e.g., Electrical, 4/26-27/00.Test, FSW FQT, CSC?, Plan, BATC IN0090-106, DM-07, 3/29/00. Proc, BATC IN0090-307, DM-08, 2/23/03. Report, BATC IN0090-XXX, DM-08, ?/XX/03.Test, COS Sys T/V w/ RAS/Cal, Plan, XXXX, ?/XX/02. Report?Test,

CU/BATCBATC

BATC

GSFC/I&T

d

t

• These requirements are satisfied as witnessed by this presentation. AV-04 (SI Pre-Launch Calibration Data) will serve as the final document demonstrating that these requirements are satisfied. “Functional and diagnostic tests” are verified the the CS FSW Requirements Document and associated traceability and verification matrices.


280

281

A B C D E F G H I J K L M N O4.3.5-1 Protection C

EI

COS shall have the capability to detect and take corrective action against illumination that is bright enough to damage its detectors.

Sys C t Protection, Confirm that BOP mode exists & exercised via control SW & verif through exam of resultant op test data. Doced via SW Design Doc (DM-03) & exercised per Cmd Dev Handbook (DM-05) & verif through SW Test Report (DM-08) data.

1

4.3.5-2 Illumination Detection Capability

CEI

Each channel shall have the ability to recognize dangerously bright conditions either as a global (flat field) illumination or as a local (point source) illumination.

Sys C t Illumination Detection Capability , Verif each channel has BOP mode & exercised via control SW & verif through exam of resultant op test data. ".

1

2/03

?/XX/0X

Test, FSW FQT, CSC?, Plan, BATC IN0090-106, DM-07, 3/29/00. Proc, BATC IN0090-307, DM-08, 2/23/03. Report, BATC IN0090-XXX, DM-08, ?/XX/03.Test, on HW? , Proc, XXXX, ?/XX/0X. No [12/11]

BATC

BATC or

GSFC?

267

268

269

270

271272

273

274

275

A B C D E F G H I J K L M N O4.3.3-1

4.3.3-2

4.3.3-3

4.3.3-4

4.3.3-5 Calibration Data Acquisition

CEI

5. Calibration data acquisition Sys C Calibration Data Acquisition, ". 1

4.3.3-6 Multiple Formats I N/A, req list header: Multiple Formats. - - - -4.3.3-7 Photon List C

EI

time tagged (photon list) Sys C t Photon List, Detector readout processing. Doced via SW Design Doc (DM-03) &/or SI Science Data Format (DM-06) & exercised per Cmd Dev Handbook (DM-05) & verif through SW Test Report (DM-08) data.

1

4.3.3-8 Temporal Accumulation CEI

image (accumulate over time) Sys C t Temporal Accumulation, ". 1

4.3.3-9 Subarrays CEI

It shall be possible to collect data from subarrays (windows) from either detector.

Sys C t Subarrays, Met by electronics & SW design. Implemented by design of macro params & design of timing patterns. Doced via SW Design Doc (DM-03) &/or SI Science Data Format (DM-06) & exercised per Cmd Dev Handbook (DM-05) & verif through SW Test Report (DM-0

1

Test, FSW FQT, CSC?

Test, COS Sys T/V w/ RAS/Cal, Plan, XXXX, ?/XX/02. Report?

Test, COS FT on VEST, RFR (VEST I&T), Proc, P-442-XXXX, ?/XX/0X.

BATC

BATC

GSFC/I&T

4/26-27/00

2/03

2/03

?/XX/0X

Design, COS CDR Pkg, e.g., Electrical, 4/26-27/00.Test, FSW FQT, CSC?, Plan, BATC IN0090-106, DM-07, 3/29/00. Proc, BATC IN0090-307, DM-08, 2/23/03. Report, BATC IN0090-XXX, DM-08, ?/XX/03.Test, COS Sys T/V w/ RAS/Cal, Plan, XXXX, ?/XX/02. Report?Test,

2/03

2/03

?/XX/0X

Both detectors shall have the capability to provide data in either of two formats:

CU/BATCBATC

BATC

GSFC/I&T

d

t

Bright Object Protection

• The detectors are only capable of producing x,y event streams (time tag). Acquisition of an accumulated image is provided by the CS DIB & DIB. There is no requirement that either detector alone acquire an image, only that COS instrument support this mode of operation.

– Verified in CS DIB & DIB Component Level Tests

• Acquisition of data within sub-arrays is also provided by the DIB.– Verified in CS DIB & DIB Component Level Tests

• Protection against global and/or local over-light conditions is provided by the DCE, CS DCE, MCE, and CS MCE FSE. Verification is documented in the respective Component Level Tests.

resolution specification

Documents

expected resolution

crossdispersion resolution

detector xresolution

high spectral resolution

preship reviewste

qe specifications ucb

gn2 environment

wavelength calibration