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A. A. Moiseev (NASA/GSFC/USRA), J. F. Ormes, D. J. Thompson (NASA/GSFC), GLAST Collaboration
GLAST is a proposed intermediate-class mission for high-energy gamma-ray astrophysics. Its Anticoincidence Detector (ACD) is based on the heritage of the SAS-2, COS-B and EGRET telescopes. GLAST will be studying gamma radiation up to 300 GeV. Gamma rays of such high energy create a huge number of secondary particles in the calorimeter of the telescope; some of them may interact in the ACD, causing self-veto and reducing dramatically the efficiency of the instrument for the detection of high energy photons. Instead of a monolithic scintillator dome as used in previous missions, the Anticoincidence Detector for GLAST is divided into many scintillating tiles to avoid the efficiency degradation at high energy. The approach to the design of this system, simulated performance, and beam test results are presented.
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