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GLAST LAT Tracker Tower-B Pre-Ship Review

GLAST LAT Tracker Tower-B Pre-Ship Review. Luca Latronico INFN-Pisa luca.latronico@pi.infn.it. Tower B Assembly and test highlights. 1/3-1/11 2005 (INFN-Pisa) : assembly (tray stack, cables, sidewalls, alignment, turn-over) test (CPT) 1/17-2/5 2005 (Alenia-Roma) : VIB test (1/17-18)

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GLAST LAT Tracker Tower-B Pre-Ship Review

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  1. GLAST LAT Tracker Tower-B Pre-Ship Review Luca Latronico INFN-Pisa luca.latronico@pi.infn.it

  2. Tower B Assembly and test highlights • 1/3-1/11 2005 (INFN-Pisa) : • assembly (tray stack, cables, sidewalls, alignment, turn-over) • test (CPT) • 1/17-2/5 2005 (Alenia-Roma) : • VIB test (1/17-18) • New TVAC chamber setup (see NCR/FM/INFN/PI-379) • TVAC test (1/29-2/5) • 2/8 2005 (INFN-Pisa) : • Alignment verification • 2/10 2005: • Through customs in Roma airport • Full EIDP details at: • http://glast.pi.infn.it • Quality Assurance page • EIDP links

  3. Before Vibe Test After Vibe Test Tower Alignment data • All measurements within stay-clear and in spec before and after ENV tests

  4. TOWER CG & MASS Conclusions • Tower well aligned and inside stayclear • Stable after Env. Test • Mass and CG near estimated values (when used real masses)

  5. Assembly and components details Tower PN: LAT-DS-00722 (rev2) Tower SN: B Relevant issues and related NCRs: • INFN/PI-220 (tray Bottom 006) • M4X6 instead of M4x8 • Proposed disposition is use as is and close • INFN/PI-362 (Tower B) • Critical insulation of termination resistor on cable 7 • SLAC will provide all cables with Kapton to protect resistors • Proposed disposition is use as is and close • INFN/PI-371 (Tower B) • Critical insulation between tower cables and fixing clips • Kapton tape was used • Proposed dispositions are • SLAC will provide all cables with kapton on all termination resistors • use as is and close • INFN/PI-349 (tray heavy 037) • GTFE21 back side instabilities • Found to be due to bad termination resistor (100Ohm) on test cable • Proposed disposition is use as is and close • INFN/PI-383 (Tower B) • Complete CPT not performed • Proposed dispositions are • use as is and close • Consider removing test from flow-chart and rely on final test after TVAC

  6. VIB test No new channel loss No change in alignment TVAC test New chamber setup Vacuum level slightly below spec (NCR-379-closed) Charge to Alenia to investigate chamber capabilities Environmental tests highlights

  7. total disconnected channels < 0.25% • ~50% of disconnected channels in 2 layers (Y12, X7): • X7 with large oscillations vs temperature • Y12 responsible for overall channel loss • all other layers were very stable

  8. Semi-disconnected channels (broken ladder wire-bonds) 1 layer only (X5 – tray H037-Front) ~60 bad channels which stabilized during tray thermal cycle and tower assembly no further degradation during tower ENV tests see NCR-368

  9. Open NCRs related to disconnected/bad channels • Bad channels NCRs - proposed disposition is use as is and close : • INFN/PI-368 (tray Heavy 037) • Last disposition (MRB 1/12/2005) is use as is for tower B; build ladders with no encapsulation and test on tower 1 • Disconnected channels NCRs – proposed disposition is use as is and close: • INFN/PI-350 (tray MID 051) • 2 more channels lost in TVAC • INFN/PI-346 (tray MID 043) • 24 more channels lost in tray thermal cycle and tower TVAC • INFN/PI-384 (tray MID 023) • Large fluctuation in number of disconnect vs temperature • INFN/PI-389 (tray Heavy 018) • 13 disconnected and 4 noisy found during TVAC test

  10. Conclusions • Tower B was assembled, tested and shipped to SLAC in 2 weeks (2 more weeks were lost for the setup of the new Alenia TVAC chamber) • No major issue were found in assembly, environmental tests, performance verification – a number of minor issues must be addressed before tower1 activities • The overall number of bad channels is very low • New MCMs with no PA disconnection will reduce even more this number and its stability with time/temperature • New heavy and bottom ladders with no wire-bond encapsulation will show their reliability soon (tower1 trays data available next Monday right before assembly)

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