Tracker Subsystem 1 GLAST LAT Project FM-B PSR, 10 Feb, 2005 GLAST LAT Tracker GLAST LAT Tracker Tower-B Pre-Ship Review Tower-B Pre-Ship Review Luca Latronico INFN-Pisa [email protected]
Dec 21, 2015
Tracker Subsystem 1
GLAST LAT Project FM-B PSR, 10 Feb, 2005
GLAST LAT TrackerGLAST LAT Tracker
Tower-B Pre-Ship ReviewTower-B Pre-Ship Review
Luca Latronico
INFN-Pisa
Tracker Subsystem 2
GLAST LAT Project FM-B PSR, 10 Feb, 2005
Tower B Assembly and test highlightsTower 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
Tracker Subsystem 3
GLAST LAT Project FM-B PSR, 10 Feb, 2005
Tower Alignment dataTower Alignment data
Tower Alignment CMM Data Processing Tools
ReportTower Inverted After TOF and Solithane appl. After Env Tests
Tower Half
WidthStatus Max
Tower Half
WidthStatus Max
Tower Half
WidthStatus Max
Nominal N/A 185.875 Nominal N/A 185.875 Nominal N/A 185.875Max N/A 186.25 Max N/A 186.250 Max N/A 186.250+X passed 185.989 +X passed 186.009 +X passed 186.000+Y passed 185.998 +Y passed 186.012 +Y passed 186.020-X passed -186.081 -X passed -186.106 -X passed -186.094-Y passed -186.040 -Y passed -186.007 -Y passed -186.004
Tower Full
WidthStatus Max
Tower Full
WidthStatus Max
Tower Full
WidthStatus Max
Nominal N/A 371.750 Nominal N/A 371.750 Nominal N/A 371.750Max N/A 372.50 Max N/A 372.50 Max N/A 372.50X passed 372.070 X passed 372.115 X passed 372.094Y passed 372.038 Y passed 372.020 Y passed 372.024
Washer Plane
Status Max
Nominal N/A 186.530Max N/A 186.750+X passed 186.641+Y passed 186.457-X passed -186.531-Y passed -186.495
Tower Full
WidthStatus Max
Nominal N/A 373.060Max N/A 373.500X passed 373.172Y passed 372.952
Flexure Cone
Status Theta Phi Gamma ZRadial Offset
FCS X Offset
FCS Y Offset
Alpha Beta
Nominal N/A 0.000 0.000 0.000 -37.420 0.000 0.000 0.000 0 0Tol Corner
N/A +/- 0.404 +/- 0.483 N/D -37.67 0.87 N/D -0.69 N/A N/A
Tol Side N/A N/D N/D N/D -37.67 0.87 N/D -0.35 N/A N/A0 passed 0.016 -0.087 0 -37.298 0.094 -0.026 0.091 10 -1591 passed 0.016 -0.087 0 0 0.109 -0.028 0.105 11 -1592 passed 0.041 -0.083 0.129 -37.27 0.119 0.045 0.111 12 1643 passed 0.01 -0.12 0 -37.331 0.089 -0.038 0.08 9 -1504 passed 0.01 -0.12 0 0 0.057 -0.04 0.041 6 -1325 passed 0.009 -0.137 0.129 -37.464 0.102 -0.029 -0.098 11 -116 passed 0.019 -0.041 0 -37.51 0.201 -0.176 -0.096 21 -507 passed 0.019 -0.041 0 0 0.195 -0.179 -0.078 21 -558 passed 0.004 -0.169 0.129 -37.438 0.089 0.058 -0.066 9 469 passed 0.008 0.035 0 -37.469 0.066 -0.035 -0.057 7 -2810 passed 0.008 0.035 0 0 0.036 -0.029 -0.021 3 -5211 passed 0.004 -0.183 0.129 -37.251 0.087 0.047 0.073 9 151
Before Vibe Test
After Vibe Test
All measurements within stay-clear and in spec before and after ENV tests
Tracker Subsystem 4
GLAST LAT Project FM-B PSR, 10 Feb, 2005
TOWER CG & MASSTOWER CG & MASS
298.695
TOWER Total Mass (g) 32424.80 ESTIMATED (Solithane, adhesive, tape, glues not included)
TOWER Total Mass (g) 32640.00 MEASURED (weighted)
4360.002955.00
TOWER+BP+CHP Mass (g) 39739.80 ESTIMATED (Solithane, adhesive, tape, glues not included)
241.334 ESTIMATED (Solithane, adhesive, tape, glues not included)
TOWER+BP+CHP Mass (g) 39955.00 ESTIMATED WITH MEASURED TWR TOTAL MASS
241.643 ESTIMATED WITH MEASURED TWR TOTAL MASS
TWR+BP+CHP CG from Flexures
TWR+BP+CHP CG from Flexures
Tower CG from Flexures
Base Plate (g)Cables Holding Plate (g)
Conclusions
Tower well aligned and inside stayclear
Stable after Env. Test
Mass and CG near estimated values (when used real masses)
Tracker Subsystem 5
GLAST LAT Project FM-B PSR, 10 Feb, 2005
Assembly and components detailsAssembly and components details
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
Tracker Subsystem 6
GLAST LAT Project FM-B PSR, 10 Feb, 2005
Environmental tests highlightsEnvironmental tests highlights
• 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
1.E-06
1.E-05
1.E-04
1.E-03
29/01/20050.00.00
30/01/20050.00.00
31/01/20050.00.00
01/02/20050.00.00
02/02/20050.00.00
03/02/20050.00.00
04/02/20050.00.00
05/02/20050.00.00
06/02/20050.00.00
07/02/20050.00.00
Date
Pre
ssu
re(t
orr
)
Pressure(torr)
Tracker Subsystem 7
GLAST LAT Project FM-B PSR, 10 Feb, 2005
Disconnected channels in different runs
0
20
40
60
80
100
120
140
160N
um
ber
of
dis
con
nec
ted
ch
ans
Total
Total - (Y12 & X7)
Y12 (MID 043 Front)
X7 (MID 023 Front)
• 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
Tracker Subsystem 8
GLAST LAT Project FM-B PSR, 10 Feb, 2005
Semi-disconnected channels (broken ladder wire-bonds)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
Tracker Subsystem 9
GLAST LAT Project FM-B PSR, 10 Feb, 2005
Open NCRs related to disconnected/bad channelsOpen 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
Tracker Subsystem 10
GLAST LAT Project FM-B PSR, 10 Feb, 2005
ConclusionsConclusions
• 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)