GLAST Large Area Telescope Performance Monitoring and Calibrations On Orbit

Details GLAST Large Area Telescope Performance Monitoring and Calibrations On Orbit GLAST Large Area Telescope Performance Monitoring and Calibrations On Orbit

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1804b&link_type=abstract

American Astronomical Society, HEAD meeting #9, #18.04; Bulletin of the American Astronomical Society, Vol. 38, p.382

Computer Science

Performance

Scientific paper

The Large Area Telescope (LAT) is one of the two instruments onboard the Gamma ray Large Area Space Telescope (GLAST), the next generation high energy gamma ray telescope, which is due to be launched in Fall of 2007. It is comprised of sixteen identical towers in a four by four grid, each tower containing a silicon tracker and a CsI calorimeter that together will give the incident direction of the pair-converting photon and the photon energy. The instrument is covered by an AntiCoincidence Detector (ACD) to reject charged particle background. Altogether, the LAT contains more than 800.000 channels in the trackers, 1536 CsI crystals and 97 ACD tiles and ribbons.
This poster details some of strategies and methods for calibrating the instrument on orbit, including both particle based calibrations, using Galactic Cosmic Rays (GCR) and CNO events, and charge injection, that will be necessary to ensure a satisfactory performance of the LAT in its energy range from 20 MeV to 300 GeV. It will also detail how we are planning to monitor the instrument performance during operations on orbit, including both low level detector monitoring and more high level analysis based monitoring using astrophysical sources.

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