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

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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 ... continued below

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2 pages

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Thompson, D.J.; /NASA, Goddard; Charles, E.; /SLAC; Hartman, R.C.; /NASA, Goddard et al. October 22, 2007.

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Description

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.

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2 pages

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  • Journal Name: AIP Conf.Proc.921:588-589,2007; Conference: Prepared for 1st GLAST Symposium, Stanford, Palo Alto, 5-8 Feb 2007

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  • Report No.: SLAC-PUB-12900
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 918535
  • Archival Resource Key: ark:/67531/metadc886501

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  • October 22, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 30, 2016, 4:20 p.m.

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Thompson, D.J.; /NASA, Goddard; Charles, E.; /SLAC; Hartman, R.C.; /NASA, Goddard et al. Performance of the Anti-Coincidence Detector on the GLAST Large Area Telescope, article, October 22, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc886501/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.