GLAST%20status%20report

1

• GLAST Large Area Telescope
• CAL Status report
• Jim Panetta
• IT/Online
• SLAC
• CAL Delivery
• CAL Integration
• CAL Testing
• CAL Current Status
• panetta_at_slac.stanford.edu
• 650-926-2995

2
Timeline

• 08/05 Calorimeter delivered from NRL to SLAC
• 08/05 Script integration starts
• 08/08 Preliminary functional tests complete
• 08/11 Final functional tests complete. SLAC
  accepts delivery
• 08/12 Instrument characterization begins
• 09/02 CAL/TKR, First integration
• 09/05 Script integration completes
• 09/18 CAL/TKR Second integration

3
Delivery

• Delivered on time, 08/05
• One bad channel, delaminated high energy PIN
  diode
• Delamination occurred prior to delivery to SLAC

4
Script Migration

• Migrated to version P01-07-00 of LATTE
• Crucial for external sites to follow IT
  revisions from this time forward
• Quite time consuming (1 man-month)
• Implemented integrated test report class
• Input parameters and files
• Output parameters and files
• Test result presentation
• Migration from external plotting packages to
  HippoDraw

5
Integration
6
CAL Characterization

• Pedestals
• 15 - 20 minute characterization.

end
pedestal sigma (ADC counts)

• Need understanding of algorithms

- end
xtal number
7
CAL Characterization, cont.
Pedestal noise time history
Integrated system
NRL
8
CAL Characterization, cont.

• Timing wrt. TKR and External trigger
• Gains and Noise measurements
• Single crystal
• slopes

Light asymmetry Log ( ADC(pos) / ADC(neg) )
Muon traverse Position
9
Script Migration TBD

• Abstraction of some low level interfaces
• e.g. Functional interface to trigger
• Better tracking of configuration data
• Into FITS data files
• Into test reports
• Time tracking of test results
• Documentation, external internal
• Finish graphics migration to HippoDraw

10
Current Status and Problems

• Status
• Taking data with integrated system
• Pedestals and noise well understood
• Total of 5 to 10 M cosmics expected
• Problems
• Insufficient understanding of algorithms
• In place revisions of scripts
• Require better integration of test reports
• Test reports not exported (IT in progress)
• Some configuration files in undocumented format