hst quarterly review page 1 space telescope science institute 12 february 2004 si status: cos stsci...

HST Quarterly Review

Space

Telescope Science Institute

12 February 2004SI Status: COS

STScI Support of COS Thermal-Vacuum Testing

• COS Thermal-Vacuum Testing at Ball All vacuum testing completed in late October Additonal post-TV OSM-motion characterization under N2 purge completed in Nov SI open-shutter light-leak test performed; results well below limits

• STScI Thermal-Vac participation Closely coordinated STScI support activities with IDT STScI COS Instrument Scientists provided onsite support for SI operation, data-taking,

and analysis in all phases of Thermal-Vacuum testing Keyes, Sembach, Leitherer, Friedman, and Bohlin stood multiple-day shifts as

data analysts Hartig provided frequent onsite optical alignment support

STScI provided OPUS processing, conversion to FITS, and HDA-archival of all COS Thermal-Vacuum and N2 purge data Processed approximately 3300 datasets through to archive Also calibrated all science datasets with development version of STSDAS calcos

- Minor keyword updates identified

• Supported COS pre-ship review and GSFC review of OSM-motion data analysis Optic Select Mechanism settles by more than 1 resel per 3600 sec following some

large moves; agreed testing and operational fix to be explored


Space



STScI Ground Systems and User Support Activities

• STScI scheduling system Coordinated parallels exposure development and testing completed

• STScI keyword dictionary draft (for online ICD-19) completed (Leitherer)

• Prepared requirements and outline for COS Instrument Handbook Development was to start in February 2004 (Sembach, Leitherer)

• Spectroscopic APT/ETC Initial development underway synphot reference file testing begun; general ETC test plan drafted

• Calcos time-dependent sensitivity and spectrum shift-and-add capability (for FP-SPLITs) completed (Hodge)

• Integrated Pipeline Test development suspended

• Detailed review of OSM-motion at STScI STScI and IDT scientists, engineers, and developers met in January Analyzed and agreed upon IDT-derived computational amelioration algorithm COS FIG agreed upon outline for operational implementation of correction procedures

and algorithm Included considerations for calibration lamp life, telescope scheduling efficiency,

onboard aft-shroud light-leak “good-neighbor policy,” and calcos


Space



Science Calibration: FUV 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

/ph

oto

n

CEI minimum

CEI peak

component model

G130MAppendix B measurements

• Efficiency exceeds required specification at all wavelengths

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

1400 1500 1600 1700 1800

Angstroms

cts

/ph

oto

n

CEI minimum

CEI peak

component model

G160MAppendix B measurements


Space



Repeatability scatter:centroids 1 ~4 pixels brightness 1 ~ 2%Analysis by Scott Friedman

FUV G160M wavecal: line position and flux

repeatability


Space



17000

18000

19000

20000

21000

22000

23000

24000

25000

26000

27000

28000

29000

30000

2070 2170 2270 2370 2470 2570

lam2186lam2217lam2233lam2250lam2268lam2283lam2306lam2325lam2339lam2357lam2373lam2390lam2410

• G225M resolution meets or exceeds specification at all wavelengths

Science Calibration: G225M Resolution

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

hst quarterly review page 1 space telescope science institute 12 february 2004 si status: cos stsci...

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