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

Conference · Mon Oct 22 00:00:00 EDT 2007 · AIP Conf.Proc.921:588-589,2007

DOI:https://doi.org/10.1063/1.2757465· OSTI ID:918535

Thompson, D J; Charles, E; Hartman, R C; Moiseev, A A; Ormes, J F

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.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 918535
• Report Number(s): SLAC-PUB-12900
• Conference Information: Journal Name: AIP Conf.Proc.921:588-589,2007 Journal Volume: 921
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHARGED PARTICLES
COSMIC PHOTONS
DESIGN
DETECTION
EFFICIENCY
GAMMA ASTRONOMY
Instrumentation
INST
PERFORMANCE
PROBABILITY
RADIATIONS
TELESCOPES
TESTING