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Proceedings Paper

Simulation studies on performance parameters of a TPC polarimeter
Author(s): Rakhee K.; Koushal V.; Radhakrishna V.; Baishali G.; Vinodkumar A. M.
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Paper 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 driftgap 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%.

Paper Details

Date Published: 24 July 2014
PDF: 8 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91444K (24 July 2014); doi: 10.1117/12.2055190
Show Author Affiliations
Rakhee K., ISRO Satellite Ctr. (India)
Univ. of Calicut (India)
Koushal V., ISRO Satellite Ctr. (India)
Radhakrishna V., ISRO Satellite Ctr. (India)
Baishali G., Indian Institute of Science Bangalore (India)
Vinodkumar A. M., Univ. of Calicut (India)

Published in SPIE Proceedings Vol. 9144:
Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz, Editor(s)

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