glast lat tracker tower7/9 pre-ship review

Tracker Subsystem 1

GLAST LAT Project FM7/9 PSR, Sept. 9, 2005

GLAST LAT TrackerGLAST LAT Tracker

Tower7/9 Pre-Ship ReviewTower7/9 Pre-Ship Review

[email protected]

INFN-Pisa

Tracker Subsystem 2


Tower 7 - Assembly and test highlightsTower 7 - Assembly and test highlights

• June 14 - July 4, 2005 (INFN-Pisa) : – assembly of complete tray stack

– incomplete cable set (C0,C1,C2,C3,C4,C7)

– Sidewalls, alignment

• July 7-15, 2005 (Alenia-Roma) : – VIB, TVAC test RUN I

• NCR 544 layerX17 noise anomaly

• July 25-26, 2005 (INFN-Pisa) : – Tray 17 replacement

– C5 installation

• July 28 – August 31, 2005 (Alenia-Roma)– TVAC (7/28-8/4) RUN II

– VIB (8/31) RUN II (Z axis only)

• September 1-5, 2005 (INFN-Pisa) : – C6 installation

– Solithane, EMI taping

– Alignment verification, final CPT

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

Aluminum service sidewall

tray17 replacement

tray to be replaced

Tracker Subsystem 3


Tower 7 – Environmental test runs configurationsTower 7 – Environmental test runs configurations

Tracker Subsystem 4


Tower 7 Tower 7 Delivery configurationDelivery configuration

Tower PN: LAT-DS-00722 (rev3)Tower SN: 7Details on NCR 530

Tracker Subsystem 5


Tower 7 – Configuration and mechanical verificationsTower 7 – Configuration and mechanical verifications

Alignment, Mass, COG:

• Tower 7 well aligned and inside stayclear

• Mass (32.705Kg) and CG near estimated values (when used real masses)

• Full data available from EIDP and INFN-PISA web site

Configuration:• Kapton tape and foam applied on the flex

cables as per LAT-DS-00722• 4 layers of Poron foam 0.037 THK used on

Bottom and Top Tray (–X) side (in place of 5 layers)

• Base Plate assembly:•Torque of nuts 5.3 Nm, spec is (5.08 +0.56/-0 Nm)

Tracker Subsystem 6


Tower 7 – Open NCRsTower 7 – Open NCRs

• INFN/PI-530: environmental test in non-flight configuration– both environmental test runs were performed with missing cables, as agreed by an MRB– As a consequence of the missing solithane, 4 screws loss nominal torque and 1 was halfway

unscrewed on one sidewall after Z-axis vibrations: the screws were re-torqued to spec and the following X and Y axis vibrations did not show any torque loss

– the NCR can be closedthe NCR can be closed

• INFN/PI-543: layer X7 not read out (TVAC RUN I)– X7 could not be readout at power up after vib test. X7 was properly read at the following and

first switch on during TVAC– The problem is due to a known and documented issue with resetting MCM (NCR 417) with

missing cables– To avoid the many and unknown number of power cycle needed to re-establish a good

configuration with as many readable layers as possible, hot/cold switch on and off were not performed


• INFN/PI-544: layer X17 noisy at hot soak (TVAC RUN I)– As per MRB decision, tray 17 (MID010) was replaced with a new tray, and tower7 retested– the NCR can be closedthe NCR can be closed

• INFN/PI-570: cold/hot power off/on not performed (TVAC RUN II)– Same as NCR 543 – the NCR can be closedthe NCR can be closed

• INFN/PI-547: Vacuum level out of specification (TVAC RUN I)– The situation is similar to earlier TVAC tests and the proposal is to accept the test as for

previous MRBs. Tower 6 was tested with tower 7 RUN I and the same NCR was closed

Tracker Subsystem 7


TKR Tower 7 Bad channels (noisy + dead + disconnected)

0

5

10

15

20

25

CP

T N

o C

able 56

CP

T R

T

LP

T at 25 fro

m 1st h

ot to

1st cold

LP

T at 0 fro

m 1st h

ot to

1st cold

CP

T at 2n

d h

ot so

ak

CP

T @

3rd H

ot S

oak

LP

T @

0C fro

m 3rd

ho

t to 3rd

cold

TW

R7 L

PT

@ ~

0 C fro

m 3rd

cold

to 4th

ho

t

TW

R7 L

PT

@ 0C

from

4th h

ot to

4th co

ld

TW

R7 C

PT

RT

in vacu

um

TW

R7 R

e-Test: C

PT

at RT

in vacu

um

TW

R7 R

e-Test: C

PT

1st Ho

t So

ak

TW

R7 R

e-Test L

PT

at 30C

TW

R7 R

e-Test L

PT

at 0C fro

m 1st h

ot to

1st cold

TW

R7 R

e-Test L

PT

at 0C fro

m 1st co

ld to

2nd

ho

t

TW

R7 R

e-Test L

PT

at 30C fro

m 1st co

ld to

2nd

ho

t

TW

R7 R

e-Test L

PT

at 30C fro

m 2n

d h

ot to

2nd

cold

TW

R7 R

e-Test L

PT

at 0C fro

m 2n

d h

ot to

2nd

cold

TW

R7 R

e-Test L

PT

at 0C fro

m 2n

d co

ld to

3rd h

ot

TW

R7 R

e-Test L

PT

at 30C fro

m 2n

d co

ld to

3rd h

ot

TW

R7 R

e-Test L

PT

at 30C fro

m 3rd

ho

t to 3rd

cold

soak

TW

R7 R

e-Test L

PT

at 0C fro

m 3rd

ho

t to 3rd

cold

soak

TW

R7 R

e-Test L

PT

at 0C 3rd

cold

--> 4th

ho

t soak

TW

R7 R

e-Test L

PT

at 30C 3rd

cold

--> 4th

ho

t soak

TW

R7 R

e-Test L

PT

at 30C 4th

ho

t --> 4th

cold

soak

TW

R7 R

e-Test L

PT

at 0C 4th

ho

t --> 4th

cold

soak

TW

R7 R

e-Test L

PT

at 0 from

4th co

ld to

RT

TW

R7 R

e-Test C

PT

at RT

in vacu

um

Y17

X5

Y2

16ch Level

X17

Y1RUN I RUN II

• NCR 534: 2 layers (Y2, X5) sometimes out of spec due to fluctuations in noisy channels; the NCR can be closed

• X17 fixed after tray M010 replacement• X5 showed 1 noisy ladder when ramping from 3rd cold to 4th hot soak: similar isolated anomalies,

appearing randomly and only once were observed in other towers and are very likely caused by noise pickup dependent on the setup and/or the readout system (remember NCR 461 on the interference between the 2 towers DAQ causing test failures)

Tower 7 – Bad channelsTower 7 – Bad channels

Tracker Subsystem 8


Tower 7 - EfficiencyTower 7 - Efficiency

•All layers well within spec (eff > 98%)•Differences correlated to bad channels•No change after z-axis vib retest

taken in Alenia after 2nd TVAC

Tracker Subsystem 9


Tower 7 TVAC – vacuum out of spec RUN ITower 7 TVAC – vacuum out of spec RUN I

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-60

-50

-40

-30

-20

-10

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Date

Tem

per

atu

re (

°C)

1.00E-06

1.00E-05

1.00E-04

1.00E-03

1.00E-02

101 Cold Plate 102 Cold Plate +X

103 Cold Plate +Y 105 Cold Plate -Y

01 TWR7 center top 02 TWR7 top C-O -X

04 TWR7 swall -X n.1 10 TWR7 center bot

12 TWR7 bot C-O +X 32 TWR6 center top Tray

33 TWR6 top c-o -X 37 TWR6 swall -X n.1

40 TWR6 swall +X n.9 43 TWR6 bot c-o +X

Pressurre

Same behaviour as previous tests – proposal is to accept the test:

•Vacuum slightly higher than spec (~> 10-4 vs 5x10-5 Torr) during hot soaks•Vacuum level improving with time•same pressure behaviour in dry run with MGSE

Same behaviour as tower6 TVAC, accepted during preship review (corresponding NCR 546 was closed)

Tracker Subsystem 10


Tower 9 - Assembly and test highlightsTower 9 - Assembly and test highlights

• July 8-15, 2005 (INFN-Pisa) : – assembly of complete tray stack

– incomplete cable set (C0-non-flight,C3 missing,C7-non-flight)

– Sidewalls, alignment

• July 25 – august 4, 2005 (Alenia-Roma) : – VIB, TVAC

• September 5-7, 2005 (INFN-Pisa) : – C0, C7 replacement with flight cables

– C3 installation

– Solithane, EMI taping

– Alignment verification, final CPT

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

tray to be replaced



Tower 9 – Configuration and mechanical verificationsTower 9 – Configuration and mechanical verifications

Alignment, Mass, COG:

• Tower 9 well aligned and inside stayclear

• Mass (32.840Kg) and CG near estimated values (when used real masses)

• Full data available from EIDP and INFN-PISA web site

Configuration:• Kapton tape and foam applied on the flex

cables as per LAT-DS-00722• 4 layers of Poron foam 0.037 THK used on

Bottom and Top Tray (–X) side (in place of 5 layers)

• Base Plate assembly:•Torque of nuts 5.4 Nm, spec is (5.08 +0.56/-0 Nm)



Tower 9 – Open NCRsTower 9 – Open NCRs

• INFN/PI-541: environmental test in non-flight configuration– environmental test were performed with missing cables, as agreed by an MRB

– Missing cables are the consequence of the following NCRs


• INFN/PI-560: cold/hot power off/on not performed – To avoid the many and unknown number of power cycle needed to re-establish a good

configuration with as many readable layers as possible, hot/cold switch on and off were not performed after a satisfactory running condition was found


• INFN/PI-559: layers X2 and X12 not read out– Despite the many power cycles it was never possible to reset the tower as to read these

layers; when a practical configuration was found with all layers readable but these 2, TVAC was run with such two layers disabled

– Post environmental test show no problem in the performance of these two layers (see next slide)




Tower 9 - EfficiencyTower 9 - Efficiency

•All layers well within spec (eff > 98%)•X2 @99.8%, [email protected]%•Total bad channels in tower ~50

97

98

99

100

Y17X17X16 Y16Y15X15X14 Y14Y13X13X12 Y12Y11X11X10 Y10 Y9 X9 X8 Y8 Y7 X7 X6 Y6 Y5 X5 X4 Y4 Y3 X3 X2 Y2 Y1 X1 X0 Y0

Layer

Eff

icie

ncy

Efficiency (%)100% efficiency98% requirement

Tower 9 - run 306001303

glast lat tracker tower7/9 pre-ship review

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