TKR%20Tower%20Assembly%20PRR

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GLAST LAT Tracker Tower15 Pre-Ship Review
Luca.latronico_at_pi.infn.it INFN-Pisa
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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
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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

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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

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Tower 15 - Efficiency
run 306001376 before env-test
taken in Alenia after TVAC

• All layers well within spec (eff gt 98)
• no changes in bad channels during env test
• pre-ship data analysis underway results will
  be included in EIDP

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Tower 15 - Bad channels behaviour
X0 and Y17 slightly exceed 16 during hot soaks
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Tower 15 - noisy channels behaviour
Fluctuation are due to noisy channels