GLAST LAT Project March 24, 2003 6G Tracker Peer Review, WBS 4.1.4 1 GLAST Large Area GLAST Large Area Telescope: Telescope: Tracker Subsystem WBS 4.1.4 6G: Tower module assembly A. Brez I.N.F.N. Pisa [email protected]Gamma-ray Large Gamma-ray Large Area Space Area Space Telescope Telescope
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GLAST LAT ProjectMarch 24, 2003 6G Tracker Peer Review, WBS 4.1.4 1 GLAST Large Area Telescope: Tracker Subsystem WBS 4.1.4 6G: Tower module assembly A.
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GLAST LAT Project March 24, 2003
6G Tracker Peer Review, WBS 4.1.4 1
GLAST Large Area Telescope:GLAST Large Area Telescope:
Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope
GLAST LAT Project March 24, 2003
6G Tracker Peer Review, WBS 4.1.4 2
Tower module assembly flow downTower module assembly flow down
• LAT tower module assembly follows this block diagram (see LAT-PS-01854 and LAT-PS-01855 and for details)
GLAST LAT Project March 24, 2003
6G Tracker Peer Review, WBS 4.1.4 3
Tray assembly system successfully tested during pre-engineering tower test.Fast (<1day) accurate and safe stacking of the trays.
Reference pins
Fixation holes
Safety pins
Cable opening
Fixture
Pre-engineering tower ready for transportation and tests
Lift system
LAT-PS-01854
GLAST LAT Project March 24, 2003
6G Tracker Peer Review, WBS 4.1.4 4
Cosmic ray test
Cosmic ray flux in Pisa INFN labs:∼10 Hz/tray surfaceIn one day∼500 events/stripDeep and complete tower understanding time 1 week∼
LAT-PS-01855
GLAST LAT Project March 24, 2003
6G Tracker Peer Review, WBS 4.1.4 5
ConclusionsConclusions
• 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)