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Proceedings Paper

GEANT modeling of the low-earth-orbit cosmic-ray background for the Astro-E2 XRS instrument
Author(s): Tarek Saab; Ryuichi Fujimoto; Caroline A. Kilbourne; Richard L. Kelley
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Paper Abstract

Over the last year a GEANT model of the Astro-E2 XRS instrument (including the surrounding structure of the telescope) has been developed in order to determine the rate and energy spectrum of background events due to cosmic ray protons. Background events, in the x-ray signal energy band, can be caused by the primary protons themselves, secondaries which are created in the material surrounding the XRS, or by decays of nearby activated materials. This paper will present the details of the GEANT model and will discuss the effectiveness of the telescope structure in shielding the XRS instrument and efficiency of the anti-coincidence detector at further reducing the background rate. We will also present an investigation of the rate and spectrum of cosmic ray particles passing through the Si frame, which acts as a mechanical support and thermal sink to the x-ray pixels, in order to determine whether sufficient heating will occur in the Si frame to affect the response of the x-ray pixels.

Paper Details

Date Published: 29 September 2004
PDF: 8 pages
Proc. SPIE 5501, High-Energy Detectors in Astronomy, (29 September 2004); doi: 10.1117/12.551945
Show Author Affiliations
Tarek Saab, NASA Goddard Space Flight Ctr. (United States)
Ryuichi Fujimoto, Institute of Space and Astronautical Science (Japan)
Caroline A. Kilbourne, NASA Goddard Space Flight Ctr. (United States)
Richard L. Kelley, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 5501:
High-Energy Detectors in Astronomy
Andrew D. Holland, Editor(s)

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