The Anti-Coincidence Detector for the GLAST Large Area Telescope

Abstract

This paper describes the design, fabrication and testing of the Anti-Coincidence Detector (ACD) for the Gamma-ray Large Area Space Telescope (GLAST) Large Area Telescope (LAT). The ACD is LAT first-level defense against the charged cosmic ray background that outnumbers the gamma rays by 3-5 orders of magnitude. The ACD covers the top and 4 sides of the LAT tracking detector, requiring a total active area of ~8.3 square meters. The ACD detector utilizes plastic scintillator tiles with wave-length shifting fiber readout. In order to suppress self-veto by shower particles at high gamma-ray energies, the ACD is segmented into 89 tiles of different sizes. The overall ACD efficiency for detection of singly charged relativistic particles entering the tracking detector from the top or sides of the LAT exceeds the required 0.9997.

arXiv comment33 pages, 19 figures

References in corpus (4)

• EGRET Observations of the Extragalactic Gamma Ray Emission
• The Energy Spectra and Relative Abundances of Electrons and Positrons in the Galactic Cosmic Radiation
• Beam Test of Gamma-ray Large Area Space Telescope Components
• Gamma ray Large Area Space Telescope (GLAST) Balloon Flight Engineering Model: Overview

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