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Drift parameters optimization of a TPC polarimeter: a simulation study

Rakhee, K and Radhakrishna, V and Koushal, V and Baishali, G and Vinodkumar, AM (2015) Drift parameters optimization of a TPC polarimeter: a simulation study. In: EXPERIMENTAL ASTRONOMY, 39 (2). pp. 303-318.

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Official URL: http://dx.doi.org/10.1007/s10686-015-9449-y


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.

Item Type: Journal Article
Publisher: SPRINGER
Additional Information: Copy right for this article belongs to the SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Keywords: X-ray polarimetry; GEM detector; TPC polarimeter; Photoelectron polarimeter
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 31 Jul 2015 05:32
Last Modified: 31 Jul 2015 05:32
URI: http://eprints.iisc.ac.in/id/eprint/51923

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