Expected performance of a hard X-ray polarimeter (POLAR) by Monte Carlo simulation
Expected performance of a hard X-ray polarimeter (POLAR) by Monte Carlo simulation
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DOI：
10.1016/j.nima.2009.04.033
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发表时间：
2009-07
影响因子：
1.4
通讯作者：
S. Xiong;Nicolas Produit;Bobing Wu
中科院分区：
文献类型：
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作者：
S. Xiong;Nicolas Produit;Bobing Wu
伽玛射线暴瞬发辐射的偏振测量可以为理解中央引擎的性质提供诊断信息。POLAR是一种小型偏振计，专门用于测量50 - 300 keV的伽玛暴的偏振，计划于2012年左右在中国空间实验室发射。一个初步的蒙特卡罗模拟已经完成，以模拟POLAR的预期性能，而POLAR的原型正在建设中。计算了不同探测器配置和触发策略下的调制因子、效率和有效面积、背景速率和最小可探测偏振（MDP）。通过优化探测器结构和触发策略，在总重量小于30 kg的约束下，可以实现确定大多数伽玛暴是否为强极化的主要科学目标，在保守的探测器结构下，MDP<10%的情况下，每年可以探测到约9个伽玛暴。
Polarization measurements of the prompt emission in gamma-ray bursts (GRBs) can provide diagnostic information for understanding the nature of the central engine. POLAR is a compact polarimeter dedicated to the polarization measurement of GRBs between 50 and 300keV and is scheduled to be launched aboard the Chinese Space Laboratory around the year 2012. A preliminary Monte Carlo simulation has been accomplished to model the expected performance of POLAR while a prototype of POLAR is being constructed. The modulation factor, efficiency and effective area, background rates and minimum detectable polarization (MDP) were calculated for different detector configurations and trigger strategies. With the optimized detector configuration and trigger strategy and the total weight constraint of less than 30kg, the primary science goal to determine whether most GRBs are strongly polarized can be achieved, and about 9GRBs/yr can be detected with an MDP<10% for the conservative detector configuration.