Development of a Broad High-Energy Gamma-Ray Telescope using Silicon Strip Detectors

Details Development of a Broad High-Energy Gamma-Ray Telescope using Silicon Strip Detectors Development of a Broad High-Energy Gamma-Ray Telescope using Silicon Strip Detectors

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...0024865m&link_type=abstract

Technical Report, Stanford Univ. Stanford, CA United States Experimental Physics Lab.

Physics

Gamma Ray Telescopes, Broadband, Design Analysis, Silicon, Detection, Pair Production, Monte Carlo Method, Data Acquisition, Cesium Iodides, Actuators

Scientific paper

The research effort has led to the development and demonstration of technology to enable the design and construction of a next-generation high-energy gamma-ray telescope that operates in the pair-production regime (E greater than 10 MeV). In particular, the technology approach developed is based on silicon-strip detector technology. A complete instrument concept based on this technology for the pair-conversion tracker and the use of CsI(T1) crystals for the calorimeter is now the baseline instrument concept for the Gamma-ray Large Area Space Telescope (GLAST) mission. GLAST is NASA's proposed high-energy gamma-ray mission designed to operate in the energy range from 10 MeV to approximately 300 GeV. GLAST, with nearly 100 times the sensitivity of EGRET, operates through pair conversion of gamma-rays and measurement of the direction and energy of the resulting e (+) - e (-) shower. The baseline design, developed with support from NASA includes a charged particle anticoincidence shield, a tracker/converter made of thin sheets of high-Z material interspersed with Si strip detectors, a CsI calorimeter and a programmable data trigger and acquisition system. The telescope is assembled as an array of modules or towers. Each tower contains elements of the tracker, calorimeter, and anticoincidence system. As originally proposed, the telescope design had 49 modules. In the more optimized design that emerged at the end of the grant period the individual modules are larger and the total number in the GLAST array is 25. Also the calorimeter design was advanced substantially to the point that it has a self-contained imaging capability, albeit much cruder than the tracker.

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