Calibration of Gamma-ray Burst Polarimeter POLAR
2015 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC)(2015)
摘要
Gamma Ray Bursts (GRBs) are the strongest explosions in the universe which might be associated with creation of black holes. Magnetic field structure and burst dynamics may influence polarization of the emitted gamma-rays. Precise polarization detection can be an ultimate tool to unveil the true GRB mechanism. POLAR is a space-borne Compton scattering detector for precise measurements of the GRB polarization. It consists of a 40$\times$40 array of plastic scintillator bars read out by 25 multi-anode PMTs (MaPMTs). It is scheduled to be launched into space in 2016 onboard of the Chinese space laboratory TG2. We present a dedicated methodology for POLAR calibration and some calibration results based on the combined use of the laboratory radioactive sources and polarized X-ray beams from the European Synchrotron Radiation Facility. They include calibration of the energy response, computation of the energy conversion factor vs. high voltage as well as determination of the threshold values, crosstalk contributions and polarization modulation factors.
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关键词
gamma-ray burst polarimeter POLAR,universe,polarization modulation factors,crosstalk,energy conversion factor,energy response,European Synchrotron Radiation Facility,polarized X-ray beams,laboratory radioactive sources,POLAR calibration,Chinese space laboratory TG2,multianode PMT,plastic scintillator bar read out,gamma-ray burst polarization,space-borne Compton scattering detector,gamma-ray burst mechanism,polarization detection,emitted gamma-ray polarization,gamma-ray burst dynamics,magnetic field structure,black holes
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