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GLAST LAT Tracker Tower6 Pre-Ship Review PowerPoint PPT Presentation


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GLAST LAT Tracker Tower6 Pre-Ship Review. [email protected] INFN-Pisa. Tower 6 - Assembly and test highlights. May 26 - June 1, 2005 (INFN-Pisa) : assembly of complete tray stack incomplete cable set (C0,C1,C2,C3,C4) due to late arrival of complete set Sidewalls, alignment

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GLAST LAT Tracker Tower6 Pre-Ship Review

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Glast lat tracker tower6 pre ship review

GLAST LAT Tracker

Tower6 Pre-Ship Review

[email protected]

INFN-Pisa


Tower 6 assembly and test highlights

Tower 6 - Assembly and test highlights

  • May 26 - June 1, 2005 (INFN-Pisa) :

    • assembly of complete tray stack

    • incomplete cable set (C0,C1,C2,C3,C4) due to late arrival of complete set

    • Sidewalls, alignment

  • July 1-4, 2005 (INFN-Pisa) :

    • Completion of flight cable installation (after sidewalls removal)

    • Final CPT and ship to Roma

  • July 5, 2005 (Alenia-Roma) :

    • VIB test

  • July 8-15, 2005 (Alenia-Roma) :

    • TVAC test with tower 7

  • July 20, 2005 (Roma)

    • Through customs in Roma airport

  • Full EIDP details at:

    • http://glast.pi.infn.it


Tower 6 assembly and components details

Tower 6 - Assembly and components details

Tower PN: LAT-DS-00722 (rev3)

Tower SN: 6


Tower 6 configuration

Tower 6 - Configuration

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 on TWR 6, spec is (5.08 +0.56/-0 Nm)

  • EMI taping TBD at SLAC


Tower 6 alignment cg mass

Tower 6 – Alignment, CG & MASS

  • Tower 6 well aligned and inside stayclear

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

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


Tower 6 open ncrs

Tower 6 – Open NCRs

  • INFN/PI-507:

    • 2 holes in the base plate were not threaded (the 5th hole from corner -X +Y on the -X side and the 3rd hole from the +X-Y corner on the +x side) and therefore the corresponding screws are missing

    • TVAC results show no impact on the tower

    • the NCR can be closed and converted into a SLAC one for reference

  • INFN/PI-533: Bad channels out of spec

    • with reference to tray NCRs 528, 529 layers X3, Y3, fail test TE301 as expected and due to known problems

    • The overall number of bad channels is small, and the status of channels was monitored through TVAC test and show no significant loss of channels (see next slide), the NCR can be closed and converted into a SLAC one for reference.

  • INFN/PI-546: 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


Glast lat tracker tower6 pre ship review

~ 180 bad channels overall (less than 0.35%): ~60% are dead, ~20% disconnected, ~20% noisy

half dead channels are located on layers X3 and Y3 and were known to slightly exceed specification already at tray level (max 16 bad chans - NCRs 528, 529): trays were accepted to maintain tower assembly schedule

Most dead channels are due to broken coupling capacitors on ladder strips that inject high currents into the corresponding GTFE amplifiers: the first ladders w/o encapsulation of the 2nd production lot were within specs but had somewhat larger number of broken AC coupling due to non perfect bonding settings, which were corrected immediately afterward. Integration of such ladders exceeded tray specification


Tower 6 efficiency

Tower 6 - Efficiency

all layers with efficiency > 99.3%, X3 with 98.9% due to bad channels

average layer efficiency (pre-ship) at the tower level is 99.7% (required 98%)


Tower 6 tvac vacuum out of spec

Tower 6 TVAC – vacuum out of spec

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


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