Gamma Large Area Silicon Telescope (GLAST)

Details Gamma Large Area Silicon Telescope (GLAST) Gamma Large Area Silicon Telescope (GLAST)

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993tmac.conf..145g&link_type=abstract

Towards a Major Atmospheric Cherenkov Detector -- II for TeV Astro/Particle Physics. Proceedings of the International Workshop h

Physics

Calorimeters, Electron-Positron Pairs, Gamma Ray Telescopes, Gamma Rays, Radiation Counters, Silicon Radiation Detectors, Angular Resolution, Coordinates, Data Acquisition, Fitting

Scientific paper

The recent discoveries and excitement generated by EGRET have prompted an investigation into modern technologies ultimately leading to the next generation space-based gamma ray telescope. The goal is to design a detector that will increase the data acquisition rate by almost two orders of magnitude beyond EGRET, while at the same time improving on the angular resolution, the energy measurement of reconstructed gamma rays, and the triggering capability of the instrument. The GLAST proposal is based on the assertion that silicon particle detectors are the technology of choice for space application: no consumables, no gas volume, robust (versus fragile), long lived, and self triggering. The GLAST detector is roughly modeled after EGRET in that a tracking module precedes a calorimeter. The GLAST Tracker has planes of thin radiation interspersed with planes of crossed-strip (x,y) 300 micron-pitch silicon detectors to measure the coordinates of converted electron-positron pairs. The gap between the layers (approximately 5 cm) provides a lever arm in track fitting resulting in an angular resolution of 0.1 deg at high energy (the low energy angular resolution at 100 MeV would be about 2 deg, limited by multiple scattering). A possible GLAST calorimeter is made of a mosaic of Csl crystals of order 10 r.l. in depth, with silicon photodiodes readout. The increased depth of the GLAST calorimeter over EGRET's extends the energy range to about 300 GeV.

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