Transcript Section 6.F - Tray Assembly

GLAST LAT Project
March 24, 2003
GLAST Large Area Telescope:
Gamma-ray Large
Area Space
Telescope
Tracker Subsystem
WBS 4.1.4
6F: Tray assembly
A. Brez
I.N.F.N. Pisa
[email protected]
6F
Tracker Peer Review, WBS 4.1.4
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GLAST LAT Project
March 24, 2003
MCM Assembly on Trays and Test (INFN)
MCM incoming test:
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Read out tests
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Noise level
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Noisy channels
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HV test
MCM final test:
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Read out tests
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Noise level
•
Noisy channels
•
HV test
Procedure doc: LAT-PS-01802
MCM assembly with glue and screws
Scotchweld 2216 A/B gray
Glue thickness .1mm
Pattern of glue lines to avoid air
trapping
Area occupancy ∼50%
⇨ Δt≲0.1 C
0
The tray is put in the tray-storage
box and is delivered to the ladder
assembly center
6F
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GLAST LAT Project
March 24, 2003
Integration of SSD Ladders onto Tracker Trays
Procedure doc: LAT-PS-01801
Assembling steps
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Assembly in G&A Engineering
6F
Tray position study, Z adjustment
The ladders are aligned on the
alignment jig
The ladders are vacuum kept by the
bridges
The glue drops are deposited on the
tray
The tray is placed again on the tool
The ladders are positioned on the tray
by means of the bridges
Glue cure (at RT for more than 6 hours)
Ladder metrology
Microbonding
MCMs fast test to check bondings
Encapsulation
The tray is placed in the tray-storage
box for delivery to test labs
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GLAST LAT Project
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The tools
All the assembly operations under C.M.M.
Glue spots deposition with automatic dispenser
Microbonding with automatic wedge bonder
C.M.M. with touch head and optical head
Reference dowels
Ladders vacuum kept on the bridges
Jig of ladders alignment
Alignment micrometers
Jig of tray alignment
6F
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GLAST LAT Project
Ladder positioning
March 24, 2003
Assembly phases
Tray positioning
1 assembly chain ready
5 assembly chains in construction
Max assembly rate : 15 trays/week
Foreseen assembly rate: 10 trays/week
Microbonding
6F
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GLAST LAT Project
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The tray storage box
This robust Aluminum box allows safe and clean shipping.
The tray can be tested in the closed box, connecting the MCMs
through the connector savers.
Fixation screws
Connector saver
protections
Connector savers
6F
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GLAST LAT Project
March 24, 2003
First results
Requirements:
Alignment error < 40m
Planarity 100m
TG02 dw
Planarity
glue pads 5mm
cure time 6h
0.4
ladder alignemnt
4.5
s=14m
4
0.3
3.5
3
Z (mm)
0.2
x=47
0.1
0
-0.1
0
100
200
300
400
2.5
x=231
2
x=404
1.5
1
0.5
Y (mm)
6F
30
20
25
5
10
15
0
-5
-1
0
-1
5
-2
0
-3
0
-2
5
0
-0.2
m
Tracker Peer Review, WBS 4.1.4
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GLAST LAT Project
March 24, 2003
Conclusions
• The tray assembly has been successfully tested: the alignment and
planarity of the ladders are in specification with possible
improvements.
• The number of tools in production will allow an assembly rate of 40
trays/month (2 towers/month) that well matches with the test rate of
the trays and towers.
6F
Tracker Peer Review, WBS 4.1.4
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