Performance of the Anti-Coincidence Detector on the GLAST Large Area Telescope

Journal Article · Thu Jul 12 04:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2757465· OSTI ID:21067326

Thompson, D J; Hartman, R C ^[1]; Charles, E ^[2]; Moiseev, A A ^[1]; Ormes, J F ^[1]

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1. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
2. Stanford Linear Accelerator Center, Menlo Park, CA 94025 (United States)

The Anti-Coincidence Detector (ACD), the outermost detector layer in the Gamma-ray Large Area Space Telescope (GLAST) Large Area Telescope (LAT), is designed to detect and veto incident cosmic ray charged particles, which outnumber cosmic gamma rays by 3-4 orders of magnitude. The challenge in ACD design is that it must have high (0.9997) detection efficiency for singly-charged relativistic particles, but must also have a low probability for self-veto of high-energy gammas by backsplash radiation from interactions in the LAT calorimeter. Simulations and tests demonstrate that the ACD meets its design requirements. The performance of the ACD has remained stable through stand-alone environmental testing, shipment across the U.S., installation onto the LAT, shipment back across the U.S., LAT environmental testing, and shipment to Arizona. As part of the fully-assembled GLAST observatory, the ACD is being readied for final testing before launch.

• OSTI ID: 21067326
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 921; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ANTICOINCIDENCE
COSMIC PHOTONS
COSMIC RAY DETECTION
DESIGN
GAMMA DETECTION
GAMMA RADIATION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PERFORMANCE
PROBABILITY
RELATIVISTIC RANGE
SHOWER COUNTERS
TELESCOPE COUNTERS
TESTING