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GLAST LAT Tracker Tower7/9 Pre-Ship Review. Luca.latronico@pi.infn.it INFN-Pisa. Tower 7 - Assembly and test highlights. tray17 replacement. June 14 - July 4, 2005 (INFN-Pisa) : assembly of complete tray stack incomplete cable set (C0,C1,C2,C3,C4,C7) Sidewalls, alignment

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slide1

GLAST LAT Tracker

Tower7/9 Pre-Ship Review

Luca.latronico@pi.infn.it

INFN-Pisa

tower 7 assembly and test highlights
Tower 7 - Assembly and test highlights

tray17 replacement

  • 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

tray to be replaced

Aluminum service sidewall

tower 7 delivery configuration
Tower 7 Delivery configuration

Tower PN: LAT-DS-00722 (rev3)

Tower SN: 7

Details on NCR 530

tower 7 configuration and mechanical verifications
Tower 7 – Configuration and mechanical verifications

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)

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
tower 7 open ncrs
Tower 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 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
    • the NCR can be closed
  • 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 closed
  • INFN/PI-570: cold/hot power off/on not performed (TVAC RUN II)
    • Same as NCR 543
    • the 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
slide7

Tower 7 – Bad channels

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 efficiency
Tower 7 - Efficiency

taken in Alenia after 2nd TVAC

All layers well within spec (eff > 98%)

Differences correlated to bad channels

No change after z-axis vib retest

tower 7 tvac vacuum out of spec run i
Tower 7 TVAC – vacuum out of spec RUN I

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)

tower 9 assembly and test highlights
Tower 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 verifications
Tower 9 – Configuration and mechanical verifications

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)

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
tower 9 open ncrs
Tower 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
    • the NCR can be closed
  • 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
    • the NCR can be closed
  • 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)
    • the NCR can be closed
tower 9 efficiency
Tower 9 - Efficiency

All layers well within spec (eff > 98%)

X2 @99.8%, X12@99.9%

Total bad channels in tower ~50