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POLAR: a Gamma-Ray Burst Polarimeter onboard the Chinese Spacelab

机译：POLAR：中国太空实验室的伽马射线爆破旋光仪

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摘要

POLAR is a novel compact space-borne Compton polarimeter conceived for a precise measurement of hard X-ray polarization and optimized for the detection of the prompt emission of Gamma-Ray Bursts (GRB) in the energy range 50.500 keV. A first detailed measurement of the polarization from astrophysical sources will lead to a better understanding of the source geometry and of the emission mechanisms. Thanks to its large modulation factor, effective area, and field of view (1/3 of the visible sky), POLAR will be able to reach a minimum detectable polarization (1- level) of about 3% for several GRB measurements per year. POLAR consists of 1600 low-Z plastic scintillator bars, read out by 25 flat-panel multi-anode photomultipliers. The incoming photons undergo Compton scattering in the bars and produce a modulation pattern; simulations and experiments have shown that the polarization degree and angle can be retrieved from this pattern with the accuracy necessary for pinning down the GRB mechanisms. Details on the qualification test campaign of the POLAR Engineering and Qualification Model are described in detail elsewhere in this conference (see abstract ID:1351). A first full-scale copy of the flight model of POLAR is currently under construction in Geneva based on the positive outcome of the qualification tests, in view of a flight on the Chinese spacelab TG-2 expected in 2014.
机译：POLAR是一种新颖的紧凑型星载康普顿旋光仪，用于精确测量硬X射线偏振，并经过优化，可检测50.500 keV能量范围内的伽马射线爆裂（GRB）迅速发射。对天体物理源极化的第一个详细测量将使人们更好地了解源的几何形状和发射机理。由于其较大的调制因子，有效面积和视场（可见天空的1/3），对于每年的几次GRB测量，POLAR都将能够达到约3％的最小可检测偏振（1-水平）。 POLAR由1600个低Z塑料闪烁体棒组成，可通过25个平板多阳极光电倍增管读出。入射的光子在条中经历康普顿散射并产生调制模式。仿真和实验表明，偏振度和角度可以从这种模式中获得，并且可以精确固定GRB机制。有关POLAR工程与资格模型的资格测试活动的详细信息，将在本次会议的其他地方进行详细介绍（请参见摘要ID：1351）。考虑到2014年中国TG-2航天飞机的飞行，目前正根据资格测试的积极成果在日内瓦建造POLAR飞行模型的第一份全尺寸副本。

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