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GLAST LAT Tracker Tower15 Pre-Ship Review

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GLAST LAT Tracker Tower15 Pre-Ship Review. [email protected] INFN-Pisa. Tower 15 - Assembly and test highlights. tray17 replacement. September 19-21, 2005 (INFN-Pisa) : assembly of complete tray stack incomplete cable set (C5 missing, C2 non-flight) Sidewalls, alignment

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slide1
GLAST LAT Tracker

Tower15 Pre-Ship Review

[email protected]

INFN-Pisa

tower 15 assembly and test highlights
Tower 15 - Assembly and test highlights

tray17 replacement

  • September 19-21, 2005 (INFN-Pisa) :
    • assembly of complete tray stack
    • incomplete cable set (C5 missing, C2 non-flight)
    • Sidewalls, alignment
  • September 29 – Oct. 3, 2005 (Alenia-Roma)
    • TVAC (9/26-29)
    • VIB (9/29-10/3)
  • October 5-11, 2005 (INFN-Pisa) :
    • C5 installation
    • C2 replacement
    • Solithane, EMI taping
    • Alignment verification, final CPT
  • Full EIDP details at:
    • http://glast.pi.infn.it

tray to be replaced

tower 15 configuration
Tower 15 – configuration

Tower PN: LAT-DS-00722 (rev3)

Tower SN: 15

Environmental test performed with following configuration variations:

  • C5 missing
  • C2-008 non-flight installed in place of C2-020

Delivery configuration notes:

  • Kapton and poron foam 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)

Alignment well within stay-clear

Measured mass 32.920 Kg

tower 15 open ncrs
Tower 15 – Open NCRs
  • INFN/PI-589: environmental test in non-flight configuration
    • the environmental tests were performed with a missing cable (C5) and 1 non-flight cables (C2), as agreed by an MRB
    • Full flight set provided after environmental test and installed before delivery
    • the NCR can be closed
  • INFN/PI-590: cold/hot power off/on not performed
    • 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
    • Update SLAC waiver LAT-XR-07340 to include tower 15?
    • the NCR can be closed
  • INFN/PI-586: 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
    • Tower 8 performed TVAC test together with tower 15 and its relative NCR was closed during tower 8 preship review on 10/5
    • the NCR can be closed
tower 15 efficiency
Tower 15 - Efficiency

run 306001376

before env-test

taken in Alenia after TVAC

All layers well within spec (eff > 98%)

no changes in bad channels during env test

pre-ship data analysis underway – results will be included in EIDP

tower 15 bad channels behaviour
Tower 15 - Bad channels behaviour

X0 and Y17 slightly exceed 16 during hot soaks

tower 15 noisy channels behaviour
Tower 15 - noisy channels behaviour

Fluctuation are due to noisy channels

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