GLAST Large Area Telescope:

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GLAST Large Area Telescope Tracker
Subsystem WBS 4.1.4 6G Tower module
assembly A. Brez I.N.F.N. Pisa Brez_at_pi.infn.it
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Tower module assembly flow down

• LAT tower module assembly follows this block
  diagram (see LAT-PS-01854 and LAT-PS-01855 and
  for details)

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Reference pins
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 (lt1day) accurate
and safe stacking of the trays.
Fixture
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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
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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 (lt1 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)