2017/07/07 by Hualin Xiao, Xiao, Hualin, Wojtek Hajdas +4
Physics and Astronomy · #Astro and Planetary Science #FOS: Physical sciences #Gamma-ray bursts and supernovae #Instrumentation and Detectors (physics.ins-det) #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Nuclear Experiment (nucl-ex) #Nuclear Physics and Applications #astro-ph.IM #nucl-ex #physics.ins-det
paper · pdf · doi:10.48550/arxiv.1707.02291
For 2017 ICRC conference
arxiv created 2017/07/07 · openalex publication_date 2017/07/07 · openalex created_date 2017/07/21 · arxiv updated 2019/08/13 · openalex updated_date 2026/07/28
POLAR is a compact wide field space-borne detector dedicated for precise measurements of the linear polarization of hard X-rays emitted by transient sources in the energy range from 50 keV to 500 keV. It consists of 1600 plastic scintillator bars grouped in 25 detector modules that are used as gamma-ray detection material. Its energy range sensitivity is optimized for detection of the prompt emission photons from the gamma-ray bursts. Measurements of the GRB polarization provide unique information on emission mechanisms as well as on composition and structure of the GRB jets. The POLAR instrument was developed by international collaboration of Switzerland, China and Poland. It was launched in space on-board the China Space Laboratory TG-2 on September 15th, 2016. Based on the ground calibration data, several high voltage and threshold settings were calculated and verified in order to obtain various energy ranges and optimized signal to background conditions for different measurement purposes. In this paper we present optimization procedure details and current test results.