24 July 2014 The POLAR gamma-ray burst polarimeter onboard the Chinese Spacelab
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Abstract
POLAR is a joint European-Chinese experiment aimed at a precise measurement of hard X-ray polarization (50-500 keV) of the prompt emission of Gamma-Ray Bursts. The main aim is a better understanding of the geometry of astrophysical sources and of the X-ray emission mechanisms. POLAR is a compact Compton polarimeter characterized by a large modulation factor, effective area, and field of view. It consists of 1600 low-Z plastic scintillator bars read out by 25 at-panel multi-anode photomultipliers. The incoming X-rays undergo Compton scattering in the bars and produce a modulation pattern; experiments with polarized synchrotron radiation and GEANT4 Monte Carlo simulations have shown that the polarization degree and angle can be retrieved from this pattern with the accuracy necessary for identifying the GRB mechanism. The flight model of POLAR is currently under construction in Geneva. The POLAR instrument will be placed onboard the Chinese spacelab TG-2, scheduled for launch in low Earth orbit in 2015. The main milestones of the space qualification campaign will be described in the paper.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Silvio Orsi, Silvio Orsi, Franck Cadoux, Franck Cadoux, Catherine Leluc, Catherine Leluc, Mercedes Paniccia, Mercedes Paniccia, Martin Pohl, Martin Pohl, Divic Rapin, Divic Rapin, Neal Gauvin, Neal Gauvin, Nicolas Produit, Nicolas Produit, Tianwei Bao, Tianwei Bao, Junying Chai, Junying Chai, Yongwei Dong, Yongwei Dong, Minnan Kong, Minnan Kong, Li Lu, Li Lu, Jiangtao Liu, Jiangtao Liu, Xin Liu, Xin Liu, Haoli Shi, Haoli Shi, Jianchao Sun, Jianchao Sun, Ruijie Wang, Ruijie Wang, Xing Wen, Xing Wen, Bobing Wu, Bobing Wu, Hualin Xiao, Hualin Xiao, Hanhui Xu, Hanhui Xu, Li Zhang, Li Zhang, Laiyu Zhang, Laiyu Zhang, Shuangnan Zhang, Shuangnan Zhang, Yongjie Zhang, Yongjie Zhang, Ilia Britvich, Ilia Britvich, Wojtek Hajdas, Wojtek Hajdas, Radoslaw Marcinkowski, Radoslaw Marcinkowski, Dominik K. Rybka, Dominik K. Rybka, Tadeusz Batsch, Tadeusz Batsch, Aleksandra Rutczynska, Aleksandra Rutczynska, Jacek Szabelski, Jacek Szabelski, Ania Zwolinska, Ania Zwolinska, } "The POLAR gamma-ray burst polarimeter onboard the Chinese Spacelab", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91440M (24 July 2014); doi: 10.1117/12.2055910; https://doi.org/10.1117/12.2055910
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