Preliminary results of the LAT Calibration Unit beam tests

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

DOI:https://doi.org/10.1063/1.2757300· OSTI ID:21067217

Baldini, L; Bellazzini, R; Bregeon, J; Brez, A; Kuss, M; Latronico, L; Minuti, M; Omodei, N; Pinchera, M; Sgro, C; Spandre, G ^[1]; Barbiellini, G; Longo, F ^[2]; Bogart, J R; Borgland, A W; Charles, E; Claus, R; Dubois, R; Focke, W B; Kelly, H M ^[3]

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1. INFN, Sezione di Pisa, L.go Pontecorvo 3, 56127 Pisa (Italy)
2. Dipartim. di Fisica, via Valerio 2, 34127 Trieste (Italy)
3. Stanford Linear Accelerator Center, Menlo Park, California, 94025 (United States)

The calibration strategy of the GLAST Large Area Telescope (LAT) combines analysis of cosmic ray data with accelerator particle beams measurements. An advanced Monte Carlo simulation of the LAT, based on the Geant4 package, was set up to reproduce the LAT response to such radiation and to benchmark the event reconstruction and the background rejection strategy before launch and during operation. To validate the LAT simulation, a massive campaign of beam tests was performed between July and November 2006, in parallel with the LAT integration and test, on the LAT Calibration Unit. This is a detector built with spare flight modules and flight-like readout electronics, which was exposed to a large variety of beams, representing the whole spectrum of the signal that will be detected by the LAT, using the CERN and the GSI accelerator facilities. Beams of photons (0 - 2.5 GeV), electrons (1 - 300 GeV), hadrons ({pi} and p, a few GeV - 100 GeV) and ions (C; Xe, 1.5 GeV/n) were shot through the CU to measure the physical processes taking place in the detector and eventually fine-tune their description in the LAT Monte Carlo simulation. This paper describes the motivations and goals of the test runs, the many different experimental setups used, the measured detector performance and preliminary results of the LAT Monte Carlo validation.

• OSTI ID: 21067217
• Journal Information: AIP Conference Proceedings, Vol. 921, Issue 1; Conference: 1. GLAST symposium, Stanford, CA (United States), 5-8 Feb 2007; Other Information: DOI: 10.1063/1.2757300; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA). GLAST LAT Collaboration; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCELERATOR FACILITIES
BENCHMARKS
CALIBRATION
COMPUTERIZED SIMULATION
COSMIC PHOTONS
COSMIC RADIATION
COSMIC RAY DETECTION
ELECTRON BEAMS
ELECTRON REACTIONS
ELECTRONS
GAMMA DETECTION
GAMMA SPECTRA
GEV RANGE
MONTE CARLO METHOD
PERFORMANCE TESTING
PROTON BEAMS
PROTON REACTIONS
READOUT SYSTEMS
TELESCOPE COUNTERS