tracker subsystem1 glast lat project fm1/3 psr, april 20, 2005 glast lat tracker tower-1/3 pre-ship...

Tracker Subsystem 1

GLAST LAT Project FM1/3 PSR, April 20, 2005

GLAST LAT TrackerGLAST LAT Tracker

Tower-1/3 Pre-Ship ReviewTower-1/3 Pre-Ship Review

INFN-Pisa

Tracker Subsystem 2


Tower 1 - Assembly and test highlightsTower 1 - Assembly and test highlights

• Feb 14-21, 2005 (INFN-Pisa) : – assembly (tray stack, cables,

sidewalls, alignment, turn-over) – test (CPT)

• Feb 28 - Mar 14, 2005 (Alenia-Roma) : – VIB test– TVAC test: noise anomaly on layer

X16 (see NCR INFN/PI-430)

• Mar 17-19, 2005 (INFN-Pisa) : – Replacement of tray 17 (M063)

• Apr 5-15, 2005 (Alenia-Roma) : – New VIB test– New TVAC test

• Apr 19, 2005 (Roma)– Through customs in Roma airport

• Full EIDP details at: – http://glast.pi.infn.it (soon available)– Quality Assurance page– EIDP links

Tracker Subsystem 3


Tower 1 - Assembly and components detailsTower 1 - Assembly and components details

Tower PN: LAT-DS-00722 (rev3)Tower SN: 1

Tracker Subsystem 4


Tower 1 - ConfigurationTower 1 - Configuration

Configuration:

• Kapton tape applied on the flex cables only on termination resistors

• Poron foam 0.047 THK used on bottom tray sides +Y and –Y (1 foam layer on cables)

• 3 layers of Poron foam 0.047 THK used on Bottom Tray X sides and Top Tray -X (in place of 5 layers of 0.037)

• Substitution of tray 063 according procedure in Annex 2 NCR/FM/INFN-PI-430

• See NCR/FM/INFN-PI-430 & NCR/FM/INFN-PI-435 for more details

Tracker Subsystem 5


Tower 1 - Alignment dataTower 1 - Alignment data

Tower Half Width Status Max

Nominal N/A 185.875

Max N/A 186.250

+X passed 185.963

+Y passed 186.091

-X passed -186.001

-Y passed -185.977

Tower Full Width Status Max

Nominal N/A 371.750

Max N/A 372.50

X passed 371.964

Y passed 372.068

Washer Plane Status Max

Nominal N/A 186.530

Max N/A 186.750

+X passed 186.453

+Y passed 186.492

-X passed -186.408

-Y passed -186.502


Nominal N/A 373.060

Max N/A 373.500

X passed 372.862

Y passed 372.994

All measurements within stay-clear and within specification.

Flexure Cone Status Theta Phi Gamma Z Radial Offset FCS X Offset FCS Y Offset Alpha Beta

Nominal N/A 0.000 0.000 0.000 -37.420 0.000 0.000 0.000 0 0

Tol Corner N/A +/- 0.404 +/- 0.483 N/D -37.670 0.870 N/D -0.690/+1.000 N/A N/A

Tol Side N/A N/D N/D N/D -37.670 0.870 N/D -0.350/+1.000 N/A N/A

0 passed 0.030 -0.070 0.000 -37.451 0.279 -0.279 -0.011 30 -72

1 passed 0.030 -0.070 0.000 0.000 0.296 -0.280 -0.094 32 -55

2 passed 0.064 -0.133 0.251 -37.439 0.172 -0.162 -0.058 18 -61

3 passed 0.030 -0.084 0.000 -37.372 0.158 0.150 0.049 16 116

4 passed 0.030 -0.084 0.000 0.000 0.149 0.149 0.010 16 101

5 passed 0.051 -0.043 0.129 -37.439 0.092 -0.026 -0.089 9 -11

6 passed 0.013 -0.001 0.000 -37.514 0.153 -0.106 -0.111 16 -35

7 passed 0.013 -0.001 0.000 0.000 0.137 -0.105 -0.088 14 -42

8 passed 0.040 -0.081 0.129 -37.458 0.116 -0.095 -0.067 12 -48

9 passed 0.048 -0.027 0.000 -37.392 0.138 0.127 0.053 14 120

10 passed 0.048 -0.027 0.000 0.000 0.129 0.129 0.003 13 98

11 passed 0.044 -0.003 0.251 -37.463 0.171 -0.156 -0.072 18 -56

Tracker Subsystem 6



Bay to Tower Assembly

<50 microns offset Center BCS to TCS

≈0 deg rotational offset from BCS to TCS

Sidewalls Profile SCS

Same shape and dimension

Same stayclear margins

Difference worst case <50 microns

Additional Comments : after solithane ******************************* Item 5A, Location of TCS in BCS ******************************* XYZ Offsets from BCS to TCS (BCS is the active coordinate system)

DIM LOC29= POSIZIONE DI PUNTOTOWER_XY_ORIGIN

MM

AS MISX 0.002Y 0.028Z 30.189

Rotational Offset from BCS to TCS about XAXIS

DIM ANGL1= ANGOLO 2D (VERO) DA LINEABCS_YAXIS SU LINEA TCS_YAXIS

GR

AS MISA 0.001

Rotational Offset from BCS to TCS about YAXIS

DIM ANGL2= ANGOLO 2D (VERO) DA LINEABCS_ZAXIS SU LINEA TCS_ZAXIS

GR

AS MISA 0.026

Rotational Offset from BCS to TCS about ZAXIS

DIM ANGL3= ANGOLO 2D (VERO) DA LINEABCS_XAXIS SU LINEA TCS_XAXIS

GR

AS MISA 359.999

Additional Comments : after repair ******************************* Item 5A, Location of TCS in BCS ******************************* XYZ Offsets from BCS to TCS (BCS is the active coordinate system)


MM

AS MISX 0.068Y 0.041Z 30.206



GR

AS MISA 0.004



GR

AS MISA 0.026



GR

AS MISA 359.999

Tracker Subsystem 7


Tower 1 - CG & MASSTower 1 - CG & MASS

Conclusions

Tower 1 well aligned and inside stayclear

Test after environmental tests skipped as per MRB 3/24/2005

Mass and CG near estimated values (when used real masses)

300

TOWER Total Mass (g) 32379 ESTIMATED (Solithane, adhesive, tape, glues not included)

TOWER Total Mass (g) 32885 MEASURED

43602825

TOWER+BP+CHP Mass (g) 39564 ESTIMATED (Solithane, adhesive, tape, glues not included)

243.233 ESTIMATED (Solithane, adhesive, tape, glues not included)

TOWER+BP+CHP Mass (g) 40070 MEASURED

243.95 MEASURED

TWR+BP+CHP CG from Flexures


Tower CG from Flexures

Base Plate (g)Cables Holding Plate (g)

Tracker Subsystem 8


Tower 1 – Open NCRsTower 1 – Open NCRs

• INFN/PI-424: Noise anomaly on layer Y0, ladder 3.– Appeared once at first TVAC cycle and never showed again.

– As per MRB held on March 21, 2005, the NCR can be closedthe NCR can be closed.

• INFN/PI-430: Malfunction of layer X16, ladder 0.– Consistently observed in vacuum.

– The tray has been replaced and it’s now under investigation.

– New VIB and TVAC tests passed successfully.

– As per MRB the NCR can be closedthe NCR can be closed.

• INFN/PI-459: Vacuum level out of specification.– Common to Tower 3, see following slides.

• INFN/PI-461: Communication problem when reading the two towers together.– Common to Tower 3, see following slides.

Tracker Subsystem 9


Tower 1 - disconnected channelsTower 1 - disconnected channels

Disconnected channels vs time/temperature

0

50

100

150

200

250

300

Nu

mb

er o

f D

isco

nn

ecte

d c

han

nel

s

Layer X17

Layer Y3

Layer Y0

All layers

• ~ 250 disconnected channels overall (less than 0.5%).• Number of disconnected channels basically stable throughout the environmental tests.• The small variation is almost completely due to three layers (related NCRs at the tray level closed):

• X17 – some cracks on the pitch adapter, no change at all through TV cycles• Y0, Y3 – most likely it’s a delamination issue

Tracker Subsystem 10


Tower 1 - EfficiencyTower 1 - Efficiency

• Overall efficiency (as measured during the post-TV CPT) at the tower level is 99.6%.



Tower 3 - Assembly and test highlightsTower 3 - Assembly and test highlights

• Mar 15-29, 2005 (INFN-Pisa) : – assembly (tray stack, cables,

sidewalls, alignment, turn-over)

– test (CPT)

• Apr 4-15, 2005 (Alenia-Roma) : – VIB test

– TVAC test:

• Apr 19, 2005 (Roma) :– Through customs in Roma airport

• Full EIDP details at: – http://glast.pi.infn.it (soon available)

– Quality Assurance page

– EIDP links



Tower 3 - Assembly and components detailsTower 3 - Assembly and components details

Tower PN: LAT-DS-00722 (rev3)Tower SN: 3



Tower 3 - ConfigurationTower 3 - Configuration

Configuration:

• Kapton tape applied on the flex cables as per Annex to NCR/FM/INFN-PI-435)

• Poron foam 0.037 THK used also for bottom tray sides +Y and –Y ( 3 Kapton tape layers + 1 foam 0.037 layer)

• 4 layers of Poron foam 0.037 THK used on Bottom Tray –X side (in place of 5 layers)



Tower 3 – Open NCRsTower 3 – Open NCRs

• INFN/PI-439: Disconnected channels on the bottom tray.– 38 disconnected channels found after the tray assembly– Increased up to 70 after the thermal cycles at the tray level (delamination issue)– Some further fluctuation during the tower environmental test– As per MRB the NCR can be closedthe NCR can be closed.

• INFN/PI-452 minor: Little scratch on one of the wafers of LGT 014.– Occurred while connecting cable 6 – J2 connector.– The layer has been continuously monitored during the tower environmental tests– The NCR can be closedThe NCR can be closed.

• INFN/PI-473 minor: Wrong positioning of the shock recorder on the ISC.– The shock recorder is rotated by 180 degrees on the x-y plane with respect to its nominal

position.– The proposed disposition is close the NCR and use as is.

• INFN/PI-459: Vacuum level out of specification.– Common to Tower 1, see following slides.

• INFN/PI-461: Communication problem when reading the two towers together.– Common to Tower 1, see following slides.




Flexure Cone Status Theta Phi Gamma Z Radial Offset FCS X Offset FCS Y Offset Alpha Beta

Nominal N/A 0.000 0.000 0.000 -37.420 0.000 0.000 0.000 0 0

Tol Corner N/A +/- 0.404 +/- 0.483 N/D -37.670 0.870 N/D -0.690/+1.000 N/A N/A

Tol Side N/A N/D N/D N/D -37.670 0.870 N/D -0.350/+1.000 N/A N/A

0 passed 0.010 -0.112 0.000 -37.463 0.344 -0.336 -0.075 37 -58

1 passed 0.010 -0.112 0.000 0.000 0.345 -0.337 -0.076 37 -58

2 passed 0.106 -0.242 0.331 -37.405 0.021 -0.017 0.012 2 -125

3 passed 0.071 -0.265 0.362 -37.304 0.146 -0.144 0.028 15 -93

4 passed 0.071 -0.265 0.362 0.000 0.170 -0.142 0.092 18 -113

5 passed 0.128 -0.074 0.251 -37.425 0.127 -0.071 -0.105 13 -27

6 passed 0.010 -0.084 0.000 -37.453 0.052 0.034 -0.040 5 43

7 passed 0.010 -0.084 0.000 0.000 0.075 0.036 -0.066 8 32

8 passed 0.068 -0.087 0.173 -37.405 0.140 -0.135 -0.036 15 -67

9 passed 0.037 -0.138 0.000 -37.429 0.103 0.098 0.029 11 112

10 passed 0.037 -0.138 0.000 0.000 0.120 0.099 -0.068 12 62

11 passed 0.074 -0.221 0.251 -37.528 0.214 -0.154 -0.149 23 -34

Additional Comments : before solitane ******************************* Item 5A, Location of TCS in BCS ******************************* XYZ Offsets from BCS to TCS (BCS is the active coordinate system)


MM

AS MISX -0.083Y -0.010Z 30.328



GR

AS MISA 0.007



GR

AS MISA 0.013



GR

AS MISA 359.997

All measurements within stay-clear and in spec

Tower Half Width Status Max

Nominal N/A 185.875

Max N/A 186.250

+X passed 185.939

+Y passed 185.967

-X passed -185.937

-Y passed -185.984


Nominal N/A 371.750

Max N/A 372.50

X passed 371.876

Y passed 371.951

Washer Plane Status Max

Nominal N/A 186.530

Max N/A 186.750

+X passed 186.443

+Y passed 186.602

-X passed -186.356

-Y passed -186.407


Nominal N/A 373.060

Max N/A 373.500

X passed 372.799

Y passed 373.009



Tower 3 - CG & MASSTower 3 - CG & MASS

Conclusions

Tower well aligned and inside stayclear

Test after environmental test skipped as per MRB 3/24/2005

Mass and CG near estimated values (when used real masses)

300.221

TOWER Total Mass (g) 32267.5 ESTIMATED (Solithane, adhesive, tape, glues not included)

TOWER Total Mass (g) 32895 MEASURED

43602810

TOWER+BP+CHP Mass (g) 39437.5 ESTIMATED (Solithane, adhesive, tape, glues not included)

243.359 ESTIMATED (Solithane, adhesive, tape, glues not included)

TOWER+BP+CHP Mass (g) 40065 MEASURED

244.249 MEASURED



Tower CG from Flexures

Base Plate (g)Cables Holding Plate (g)



Tower 3 – Disconnected channelsTower 3 – Disconnected channels

Disconnected channels vs time/temperature

0

50

100

150

200

250

Pre-th

erm

al c

ycle

s

Post-th

erm

al c

ycle

s

CPT bef

ore s

idew

alls

inst

alla

tion -

No Cab

le 0

(Pis

a)

CPT afte

r Cab

le C

0 in

stal

latio

n - upsi

de down (I

Pisa)

CPT afte

r turn

ove

r (P

isa)

CPT afte

r vib

e te

st (

ALENIA)

CPT vac

uum p

re-te

st

CPT durin

g rum

p up fr

om R

T to 1

st h

ot soak

CPT durin

g 1st

hot s

oak

CPT durin

g 1st

cold

soak

CPT durin

g 2st

hot s

oak

CPT durin

g 2nd c

old s

oak

CPT durin

g 3rd

hot s

oak

LPT tran

sitio

n from

3rd

hot 3

rd c

old s

oak

LPT tran

sitio

n from

3rd

hot 3

rd c

old s

oak <

T>=5C

CPT durin

g 3rd

cold

soak

LPT c

ross

ing 0

C durin

g ram

p up to

4th

Hot S

oak.

CPT 4

th H

ot Soak

.

LPT fr

om 4

th H

ot to 4

th c

old S

oak 3

0C

LPT fr

om 4

th H

ot to 4

th c

old S

oak 8

C

LPT fr

om 4

th H

ot to 4

th c

old S

oak -1

C

4th c

old S

oak C

PT

Rump to

am

bient t

emper

ature

LPT

CPT at a

mbie

nt in v

acuum

CPT at S

ATP

Nu

mb

er o

f D

isco

nn

ecte

d c

han

nel

sLayer X13 Layer X12Layer Y7 Layer X7Layer Y0 Y8All layers

• ~ 200 disconnected channels overall (less than 0.5%).• Number of disconnected channels basically stable throughout the environmental tests.• The overall variation is basically due to the fluctuations in the bottom tray.



Tower 3 - EfficiencyTower 3 - Efficiency

• Overall efficiency (as measured during the post-TV CPT) at the tower level is 99.6%.• The only layer out of spec is the bottom tray (see NCR INFN/PI-439)



Tower 1 and 3 – Communication problemsTower 1 and 3 – Communication problems

• Relevant NCR:– INFN/PI-461

• Symptoms:– Impossible to operate the two towers at the same time – except for the simple register tests– Both towers consistently 100% functional when tested one at a time– All the electrical tests foreseen by the procedure performed for the two towers in series

• Root cause:– The problem is still under investigation– It is clearly an issue with the EGSE/test setup and NOT an issue with the towers.

• Proposed disposition:– Continue the investigation, close the NCR INFN/PI-461 (on Tower 1 and 3) and open a

different NCR on the EGSE setup.



Tower 1 and 3 – Vacuum level out of specTower 1 and 3 – Vacuum level out of spec

• Relevant NCR:– INFN/PI-458, INFN/PI-459

• Non conformance:– The vacuum level at the first hot soak was 1.04E-4 torr (specs call for 5E-5), getting better in

the following cycles.

• Considerations and proposed disposition:– The annex to the two NCRs contains a details analysis of the data collected during the

environmental tests (explaining why INFN thinks that the goal of the test has been achieved), as well as suggestions for possible improvements of the test facility.

– See http://glast.pi.infn.it/database/scripts/newsrv/NCRAnnex/Annex1_to_NCR_FM_INFN_PI_459.doc

– The proposed disposition is use as is.



Tower 1 and 3 - ConclusionsTower 1 and 3 - Conclusions

• Assembly and test highlights:– Both towers well aligned and within stayclear– The overall number of disconnected channels is very low– All the silicon layers (but the bottom tray of tower 3) close to 100% efficiency– First environmental test of a tower (tower 1) after the EMI taping successfully completed – A few NCRs needed the completion of the environmental tests to be closed

• Issues: Tower 1 - layer X16– Noise anomaly detected during the environmental tests.– The tray has been taken apart and replaced– Environmental tests at the tower level have been repeated. Investigation on the problematic

tray goes on in parallel

• Issues: Communication problems– Clearly due to the test setup, investigation is in progress– All functional tests performed with one tower at a time powered

tracker subsystem1 glast lat project fm1/3 psr, april 20, 2005 glast lat tracker tower-1/3 pre-ship...

Documents

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