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GLAST LAT Tracker Tower15 Pre-Ship Review PowerPoint PPT Presentation


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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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GLAST LAT Tracker Tower15 Pre-Ship Review

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Glast lat tracker tower15 pre ship review

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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