Drift parameters optimization of a TPC polarimeter: a simulation study

被引：1

作者：

Rakhee, K. ^{[1
,2
]}

Radhakrishna, V. ^{[1
]}

Koushal, V. ^{[1
]}

Baishali, G. ^{[3
]}

Vinodkumar, A. M. ^{[2
]}

机构：

[1] ISRO Satellite Ctr, Space Astron Grp, Bangalore, Karnataka, India

[2] Univ Calicut, Dept Phys, Calicut 673635, Kerala, India

[3] Indian Inst Sci, Dept Instrumentat & Appl Phys, Bangalore 560012, Karnataka, India

来源：

EXPERIMENTAL ASTRONOMY | 2015年 / 39卷 / 02期

关键词：

X-ray polarimetry; GEM detector; TPC polarimeter; Photoelectron polarimeter; RAY; POLARIZATION;

D O I：

10.1007/s10686-015-9449-y

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Time Projection Chamber (TPC) based X-ray polarimeters using Gas Electron Multiplier (GEM) are currently being developed to make sensitive measurement of polarization in 2-10 keV energy range. The emission direction of the photoelectron ejected via photoelectric effect carries the information of the polarization of the incident X-ray photon. Performance of a gas based polarimeter is affected by the operating drift parameters such as gas pressure, drift field and drift-gap. We present simulation studies carried out in order to understand the effect of these operating parameters on the modulation factor of a TPC polarimeter. Models of Garfield are used to study photoelectron interaction in gas and drift of electron cloud towards GEM. Our study is aimed at achieving higher modulation factors by optimizing drift parameters. Study has shown that Ne/DME (50/50) at lower pressure and drift field can lead to desired performance of a TPC polarimeter.

引用

页码：303 / 318

页数：16

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