The Anti-Coincidence Detector for the GLAST Large Area Telescope

Journal Article · Fri Mar 23 00:00:00 EDT 2007 · Submitted to Astroparticle Physics

DOI:https://doi.org/10.1016/j.astropartphys.2006.12.003· OSTI ID:901254

Moiseev, A A; Hartman, R C; Ormes, J F; Thompson, D J; Amato, M J; Johnson, T E; Segal, K N; Sheppard, D A

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's 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 {approx}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.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 901254
• Report Number(s): SLAC-PUB-12411; astro-ph/0702581
• Journal Information: Submitted to Astroparticle Physics, Journal Name: Submitted to Astroparticle Physics
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTICOINCIDENCE
Astrophysics
ASTRO
COINCIDENCE CIRCUITS
DESIGN
EFFICIENCY
FABRICATION
GAMMA DETECTION
PLASTIC SCINTILLATORS
RADIATION DETECTORS
TELESCOPES
TESTING