Calibration of Gamma-ray Burst Polarimeter POLAR
Abstract
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 4040 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.
Keywords
Cite
@article{arxiv.1512.02784,
title = {Calibration of Gamma-ray Burst Polarimeter POLAR},
author = {H. L. Xiao and W. Hajdas and T. W. Bao and T. Batsch and T. Bernasconi and I. Cernuda and J. Y. Chai and Y. W. Dong and N. Gauvin and M. Kole and M. N. Kong and S. W. Kong and L. Li and J. T. Liu and X. Liu and R. Marcinkowski and S. Orsi and M. Pohl and N. Produit and D. Rapin and A. Rutczynska and D. Rybka and H. L. Shi and L. M. Song and J. C. Sun and J. Szabelski and B. B. Wu and R. J. Wang and X. Wen and H. H. Xu and L. Zhang and L. Y. Zhang and S. N. Zhang and X. F. Zhang and Y. J. Zhang and A. Zwolinska},
journal= {arXiv preprint arXiv:1512.02784},
year = {2016}
}
Comments
2015 IEEE NSS conference proceedings