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Proceedings Paper

A transmissive x-ray polarimeter design for hard x-ray focusing telescopes
Author(s): Hong Li; Hua Feng; Jianfeng Ji; Zhi Deng; Li He; Ming Zeng; Tenglin Li; Yinong Liu; Peiying Heng; Qiong Wu; Dong Han; Yongwei Dong; Fangjun Lu; Shuangnan Zhang
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Paper 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.

Paper Details

Date Published: 24 August 2015
PDF: 10 pages
Proc. SPIE 9601, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX, 96010V (24 August 2015); doi: 10.1117/12.2185435
Show Author Affiliations
Hong Li, Tsinghua Univ. (China)
Hua Feng, Tsinghua Univ. (China)
Jianfeng Ji, Tsinghua Univ. (China)
Zhi Deng, Tsinghua Univ. (China)
Li He, Tsinghua Univ. (China)
Ming Zeng, Tsinghua Univ. (China)
Tenglin Li, Tsinghua Univ. (China)
Yinong Liu, Tsinghua Univ. (China)
Peiying Heng, Tsinghua Univ. (China)
Qiong Wu, Tsinghua Univ. (China)
Dong Han, Tsinghua Univ. (China)
Yongwei Dong, Institute of High Energy Physics (China)
Fangjun Lu, Institute of High Energy Physics (China)
Shuangnan Zhang, Institute of High Energy Physics (China)

Published in SPIE Proceedings Vol. 9601:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX
Oswald H. Siegmund, Editor(s)

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