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Simulation studies on Performance parameters of a TPC Polarimeter

Rakhee, K and Koushal, V and Radhakrishna, V and Baishali, G and Vinodkumar, AM (2015) Simulation studies on Performance parameters of a TPC Polarimeter. In: SPACE TELESCOPES ANDINSTRUMENTATION 2014: ULTRAVIOLET TO GAMMA RAY, JUN 22-26, 2014, Montreal, CANADA.

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Official URL: http://dx.doi.org/ 10.1117/12.2055190

Abstract

X-ray polarimeters based on Time Projection Chamber (TPC) geometry are currently being studied and developed to make sensitive measurement of polarization in 2-10keV energy range. TPC soft X-ray polarimeters exploit the fact that emission direction of the photoelectron ejected via photoelectric effect in a gas proportional counter carries the information of the polarization of the incident X-ray photon. Operating parameters such as pressure, drift field and drift-gap affect the performance of a TPC polarimeter. Simulations presented here showcase the effect of these operating parameters on the modulation factor of the TPC polarimeter. Models of Garfield are used to study photoelectron interaction in gas and drift of electron cloud towards Gas Electron Multiplier (GEM). The emission direction is reconstructed from the image and modulation factor is computed. Our study has shown that Ne/DME (50/50) at lower pressure and drift field can be used for a TPC polarimeter with modulation factor of 50-65%.

Item Type: Conference Proceedings
Additional Information: Copy right for this article belongs to the SPIE-INT SOC OPTICAL ENGINEERING, 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
Keywords: X-ray polarimetry; GEM polarimeter; TPC polarimeter; photoelectron polarimeter
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Depositing User: Id for Latest eprints
Date Deposited: 22 Jun 2015 07:38
Last Modified: 22 Jun 2015 07:38
URI: http://eprints.iisc.ac.in/id/eprint/51755

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