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On-ground calibration of AGILE-GRID with a photon beam: results and lessons for the future
- Publication Year :
- 2012
- Publisher :
- Proceedings SPIE, 2012.
-
Abstract
- At the core of the AGILE scientific instrument, designed to operate on a satellite, there is the Gamma Ray Imaging Detector (GRID) consisting of a Silicon Tracker (ST), a Cesium Iodide Mini-Calorimeter and an Anti-Coincidence system of plastic scintillator bars. The ST needs an on-ground calibration with a γ-ray beam to validate the simulation used to calculate the energy response function and the effective area versus the energy and the direction of the γ rays. A tagged γ-ray beam line was designed at the Beam Test Facility (BTF) of the INFN Laboratori Nazionali of Frascati (LNF), based on an electron beam generating γ rays through bremsstrahlung in a position-sensitive target. The γ-ray energy is deduced by the difference with the post-bremsstrahlung electron energy 1-.2 The electron energy is measured by a spectrometer consisting of a dipole magnet and an array of position sensitive silicon strip detectors, the Photon Tagging System (PTS). The use of the combined BTF-PTS system as tagged photon beam requires understanding the efficiency of γ-ray tagging, the probability of fake tagging, the energy resolution and the relation of the PTS hit position versus the γ-ray energy. This paper describes this study comparing data taken during the AGILE calibration occurred in 2005 with simulation.
- Subjects :
- Physics
Photon
Spectrometer
Physics::Instrumentation and Detectors
business.industry
Astrophysics::High Energy Astrophysical Phenomena
Detector
agile
Bremsstrahlung
tagged photon beam
Scintillator
Calibrations
silicon tracker
High Energy Gamma-ray Astronomy
Optics
Beamline
Dipole magnet
business
Beam (structure)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....70d124a5cf87b2ea7b05d7f60ad8ed66