Transcript Section 6.G - Tower Assembly

GLAST LAT Project
March 24, 2003
GLAST Large Area Telescope:
Gamma-ray Large
Area Space
Telescope
Tracker Subsystem
WBS 4.1.4
6G: Tower module assembly
A. Brez
I.N.F.N. Pisa
[email protected]
6G
Tracker Peer Review, WBS 4.1.4
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GLAST LAT Project
March 24, 2003
Tower module assembly flow down
• LAT tower module assembly follows this block diagram (see LAT-PS01854 and LAT-PS-01855 and for details)
6G
Tracker Peer Review, WBS 4.1.4
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GLAST LAT Project
Reference pins
March 24, 2003
Fixation holes
Safety pins
LAT-PS-01854
Pre-engineering tower
ready for transportation
and tests
Cable opening
Lift system
Tray assembly system successfully
tested during pre-engineering tower
test.
Fast (<1day) accurate and safe
stacking of the trays.
6G
Fixture
Tracker Peer Review, WBS 4.1.4
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GLAST LAT Project
March 24, 2003
Cosmic ray test
LAT-PS-01855
Cosmic ray flux in
Pisa INFN labs:
∼10 Hz/tray surface
In one day
∼500 events/strip
Deep and complete
tower understanding
time ∼ 1 week
6G
Tracker Peer Review, WBS 4.1.4
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GLAST LAT Project
March 24, 2003
Conclusions
• With the help of a reference system made with precise aluminum walls, the
stack of the trays is fast and safe.
• Complete functional test of the tower system before sidewalls fixation.
• The sidewalls are then added. Each tray is referred to precision holes in the
sidewalls that allow a good alignment without the pileup of the
tolerances.
• The system has been tested. The tolerance was below the maximum
allowable (0.3mm). The process is fast (<1 day to mount a tower).
• The tower is a good cosmic rays telescope. The cosmic rays flux allows a
complete and deep understanding at the single channel level in a short time
(1 week)
6G
Tracker Peer Review, WBS 4.1.4
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