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Proceedings Paper

The calorimeter of the Fermi Large Area Telescope
Author(s): J. Eric Grove; W. Neil Johnson
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Paper Abstract

The Large Area Telescope (LAT), the primary instrument on the Fermi Gamma-ray Space Telescope, has been making revolutionary observations of the high-energy (20 MeV - 300 GeV) gamma-ray sky since its launch in June 2008. The LAT calorimeter is a modular array of 1536 CsI(Tl) crystals supported within 16 carbon fiber structures and read out at each crystal end with silicon PIN photodiodes to provide both energy and position information. The hodoscopic crystal stack allows imaging of electromagnetic showers and cosmic rays for improved energy measurement and background rejection. Signals from the array of photodiodes are processed by custom ASICs and commercial ADCs. We describe the calorimeter design and the primary factors that led those design choices.

Paper Details

Date Published: 29 July 2010
PDF: 11 pages
Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77320J (29 July 2010); doi: 10.1117/12.857839
Show Author Affiliations
J. Eric Grove, U.S. Naval Research Lab. (United States)
W. Neil Johnson, U.S. Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 7732:
Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Monique Arnaud; Stephen S. Murray; Tadayuki Takahashi, Editor(s)

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