24 August 2015 A transmissive x-ray polarimeter design for hard x-ray focusing telescopes
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Abstract
The X-ray Timing and Polarization (XTP) is a mission concept for a future space borne X-ray observatory and is currently selected for early phase study. We present a new design of X-ray polarimeter based on the time projection gas chamber. The polarimeter, placed above the focal plane, has an additional rear window that allows hard X-rays to penetrate (a transmission of nearly 80% at 6 keV) through it and reach the detector on the focal plane. Such a design is to compensate the low detection efficiency of gas detectors, at a low cost of sensitivity, and can maximize the science return of multilayer hard X-ray telescopes without the risk of moving focal plane instruments. The sensitivity in terms of minimum detectable polarization, based on current instrument configuration, is expected to be 3% for a 1mCrab source given an observing time of 105 s. We present preliminary test results, including photoelectron tracks and modulation curves, using a test chamber and polarized X-ray sources in the lab.
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Hong Li, Hong Li, Hua Feng, Hua Feng, Jianfeng Ji, Jianfeng Ji, Zhi Deng, Zhi Deng, Li He, Li He, Ming Zeng, Ming Zeng, Tenglin Li, Tenglin Li, Yinong Liu, Yinong Liu, Peiying Heng, Peiying Heng, Qiong Wu, Qiong Wu, Dong Han, Dong Han, Yongwei Dong, Yongwei Dong, Fangjun Lu, Fangjun Lu, Shuangnan Zhang, Shuangnan Zhang, } "A transmissive x-ray polarimeter design for hard x-ray focusing telescopes", Proc. SPIE 9601, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX, 96010V (24 August 2015); doi: 10.1117/12.2185435; https://doi.org/10.1117/12.2185435
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