GLAST LAT Tracker Towers 8/14 Pre-Ship Review

Tracker Subsystem 1

GLAST LAT Project FM8/14 PSR, Oct. 5, 2005

GLAST LAT TrackerGLAST LAT Tracker

Towers 8/14 Pre-Ship ReviewTowers 8/14 Pre-Ship Review

[email protected]

INFN-Pisa

Tracker Subsystem 2


Tower 8 - Assembly and test highlightsTower 8 - Assembly and test highlights

• July 5-18, 2005 (INFN-Pisa) : – assembly of complete tray stack– incomplete cable set (C3,C5 missing, C6 NF)– Sidewalls, alignment

• July 24 – August 5, 2005 (Alenia-Roma) : – TVAC (7/25-7/28), VIB (8/3-8/4) test RUN I

• NCR 551 layerX6 noise anomaly

• August 10 – September 8 (INFN-Pisa)– Stored in shipping container

• September 9-10, 2005 (INFN-Pisa) : – Tray 7 replacement– C3, C5 installation– C6 NF replacement– Solithane– EMI shield only on top tray for schedule reasons

shield on edges must be done at SLAC– Alignment verification, final CPT

• September 15-29, 2005 (Alenia-Roma)– VIB (9/15) RUN II (Z axis only)– TVAC (9/26-29) RUN II

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

Tracker Subsystem 3


Tower 8 – Environmental test and delivery configurationsTower 8 – Environmental test and delivery configurations

Tower PN: LAT-DS-00722 (rev3) - Tower SN: 8 - Details on NCR 540

Tracker Subsystem 4


Tower 8 – Configuration and mechanical verificationsTower 8 – Configuration and mechanical verifications

Alignment, Mass, COG:

• Tower 8 well aligned and inside stayclear

• Mass (32.930Kg) 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 5


Tower 8 – Open NCRsTower 8 – Open NCRs

• INFN/PI-540: environmental test in non-flight configuration– environmental test run I performed with missing cables C3, C5 and non-flight C6, as agreed

by an MRB

– Tower 8 sent back to Pisa for flight cable set installation and tray7 replacement (see NCR551)

– the NCR can be closedthe NCR can be closed

• INFN/PI-551: layer X6 noise anomaly (TVAC RUN I)– As per MRB decision, tray 7 (MID007) was replaced with a new tray (MID232), and tower8

retested successfully


• INFN/PI-561: hot/cold power off/on not performed (TVAC RUN I)– This is an known issue related to testing a tower in a non-flight configuration.

– A second TVAC run was performed with a full set of flight cables and such test were performed


• INFN/PI-587: 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


• INFN/PI-591: temporary isolated noise glitch on X3– Referring to NCR 592

Tracker Subsystem 6


TKR Tower 8 Disconnected channels vs time

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CPT No Sidewalls

CPT pre TV test

CPT vacuum RT

LPT at 30C

CPT at 1st Hot Soak

LPT at 30C from 1st Hot to 1st Cold Soak



CPT 1st cold soak

LPT at 0C from 1st Cold to 2nd Hot Soak

CPT 2nd Hot Soak

LPT at 0C from 2nd Hot to 2nd Cold Soak

CPT 2nd Cold Soak

LPT at 0C from 2nd Cold to 3rd Hot Soak

LPT 15C from 2nd Cold to 3rd Hot Soak

CPT 3rd Hot Soak

TWR 8 LPT at 30C

TWR 8 LPT at 15C

TWR 8 LPT at 0C

TWR 8 CPT at -15C 3rd Cold Soak

TWR 8 LPT at 0C 3rd Cold --> 4th Hot Soak



TWR 8: CPT 4th Hot Soak

TWR 8 LPT at 30C 4th Hot --> 4th Cold Soak

TWR 8 LPT at 0C 4th Hot --> 4th Cold Soak

TWR 8: CPT -15C 4th Cold Soak

TWR 8: CPT RT in vacuum

4th

TWR 8: CPT RT and room

pressure

TWR 8 retest: CPT RT and room

pressure

TWR 8 retest: CPT RT in vacuum

TWR 8 retest:1st hot soak

TWR 8 retest:lpt at 30C from

1st hot to 1st cold


1st hot to 1st cold


1st hot to 1st cold

TWR 8 retest:st Cold Soak

TWR 8 retest LPT at 0C



TWR 8 retest CPT at 2nd hot soak




TWR 8 retest: CPT at 2nd Cold Soak



TWR 8 retest: CPT at 3rd Hot Soak




TWR 8 retest CPT at 3rd Cold




TWR 8 retest CPT at 4th hot soak




TWR 8 retest CPT at 4th cold soak

TKR8 Re-test: LPT at 0 from 4th cold to RT

CPT at RT

CPT at STP

Nu

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16 bad ch Limits X16 X2 Y0 X0 X3 X6

RUN IIRUN I

• NCR 551: X6 fixed after tray M007 replacement – now in spec• NCR 592 – X3 - see following slide

Tower 8 – Bad channelsTower 8 – Bad channels

Tracker Subsystem 7


NCR 592NCR 592

•Tracker towers A, 1, 4, 7, 8, 11 showed temporary, isolated noise glitches located on one or few ladders during TVAC test. Figure 1 shows an example of such glitch measured during TE302 test (noise occupancy test on tower 8, layer X3).•Such glitches are not systematic, they appeared rarely and immediately disappeared after they are detected; the glitches typically happen at hot soaks (45/50C) or during temperature ramp-down at ~30C, when the tower temperature is not uniform (typical maximum temperature difference across the tower is 20C).•Such increase are therefore considered a glitch in the system noise or a pickup, and do not represent an anomaly in the behaviour of the tracker towers. The NCR is raised for documentation purposes.

Tracker Subsystem 8


Tower 8 - EfficiencyTower 8 - Efficiency

• All layers well within spec (eff > 98%), with fluctuations correlated to bad channels• no changes in bad channels during RUN II env test• Bad channels on new tray7 are within spec, (10 on X7 [1 disconnected, 5 dead, 4 noisy], 9 on X6 [7 dead, 2 noisy]), so we don’t expect surprises - a new efficiency analysis including this new tray will be provided along with full EIDP

taken in Alenia after 2nd TVACTVAC RUN I data

Tracker Subsystem 9


TWR8 - TWR15 - Cold Plate

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22/09/05 00.00.00 23/09/05 00.00.00 24/09/05 00.00.00 25/09/05 00.00.00 26/09/05 00.00.00 27/09/05 00.00.00 28/09/05 00.00.00 29/09/05 00.00.00 30/09/05 00.00.00

Date

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°C)

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

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101 Cold Plate 102 Cold Plate +X 103 Cold Plate +Y 104 Cold Plate -X 105 Cold Plate -Y 01 TWR15 center top

02 TWR15 top C-O -X 04 TWR15 swall -X n.1 10 TWR15 center bot 12 TWR15 bot C-O +X 32 TWR8 center top Tray 33 TWR8 top c-o -X

37 TWR8 swall -X n.1 40 TWR8 swall +X n.9 43 TWR8 bot c-o +X Pressure

Tower 8 TVAC – vacuum out of spec RUN IITower 8 TVAC – vacuum out of spec RUN II

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

Tracker Subsystem 10


Tower 14 - Assembly and test highlightsTower 14 - Assembly and test highlights

• August 19-26, 2005 (INFN-Pisa) : – assembly of complete tray stack– Complete flight cable set– Solithane, sidewalls, alignment

• September 1-15, 2005 (Alenia-Roma) : – VIB (9/1-5)– TVAC (9/12-15)

• NCR 572 for layer Y0 malfunction

• September 21-30, 2005 (INFN-Pisa) : – Bottom tray replacement– EMI shield only on top tray for schedule

reasons shield on edges must be done at SLAC

– Alignment verification, final CPT

• October 3, 2005 (Alenia-Roma) : – Z-axis new VIB test (9/1-5)

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



Tower 14 – Configuration and mechanical verificationsTower 14 – Configuration and mechanical verifications

Alignment, Mass, COG:

• Tower 9 well aligned and inside stayclear

• Mass (33.030Kg) 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 14 – Open NCRsTower 14 – Open NCRs

• INFN/PI-572: layer Y0 malfunction– Failure is compatible with a HV short on ladder 3 produced by some si-strips wire bonds in

contact with the wafer edge– As agreed on 9/27 MRB (see annex 4 for details), the following actions were taken:

• bottom tray B024 was qualified adding a vacuum test in Roma2 (room T, maximum achievable vacuum) and a thermal cycle test (standard range and duration) to standard tray tests – all such tests were run with tray readout always on and passed successfully without showing any anomaly

• bottom tray B018 was removed from tower 14; inspection of the tray shows a non-perfect adhesion of the MCM to the tray closeout on one edge that causes the short

• B018 was replaced with bottom tray B024• a Z-axis vibrational test on the reworked tower 14 was performed and passed successfully

• INFN/PI-588: Post-VIB CPT not performed– Due to unavailability of test equipment at Alenia, tower14 was not retested after the

second vib test on z-axis – SLAC will have to perform the test upon arrival – NCR 572 and 588 can be closed when CPT results from SLAC are known– The proposal is to consider Tower 14 flight even if only a z-axis vib test was performed

after bottom tray replacement. This is based on • the additional test performed on tray B024that rule out any failure like the one detected on B010• the demonstrated capability of the tracker team to perform a successful tray replacement

• INFN/PI-584: Vacuum level out of specification– The situation is similar to earlier TVAC tests and the proposal is to accept the test as for

previous MRBs. As usual the pressure is slightly out of spec during hot soaks and it gets better with time, being in spec at the 4th and last soak




Tower 14 - EfficiencyTower 14 - Efficiency

•All layers well within spec (eff > 98%), with fluctuations correlated to bad channels• no changes in bad channels during environmental test

INFN/PI RUN priori to Env-test

Documents

GLAST LAT Tracker Towers 8/14 Pre-Ship Review