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The construction and performance of the CsI hodoscopic calorimeter for the GLAST beam test engineering module

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6 Author(s)
Johnson, W.N. ; Naval Res. Lab., Washington, DC, USA ; Grove, J.E. ; Phlips, Bernard F. ; Ampe, J.
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We describe the design, construction, and performance of the CsI hodoscopic calorimeter of the GLAST beam test engineering module (BTEM), a full-size prototype of one of the 16 towers of the GLAST large-area telescope, approved by NASA to be launched in 2005. The calorimeter is composed of 80 CsI crystals organized in a hodoscopic arrangement with eight layers of ten crystals. The crystals are read out with PIN photodiodes at both ends. Light tapering along the length of the crystals produces an asymmetry in the light measured at the ends. The asymmetry is used for interaction positioning along the length of each crystal. The major design goals included the demonstration of a mechanical design to survive launch into space with minimal passive material, low power electronics with a dynamic range of ~5×105, and digital data acquisition with <20 μs dead time per event. We describe the design and give results from the analysis of the beam test in winter 1999/2000 at the Stanford Linear Accelerator Center, where the BTEM was tested in gamma, positron, and hadron beams

Published in:

Nuclear Science, IEEE Transactions on  (Volume:48 ,  Issue: 4 )

Date of Publication:

Aug 2001

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