An optimized photoelectron track reconstruction method for photoelectric X-ray polarimeters

Takao Kitaguchi; Kevin Black; Teruaki Enoto; Yasushi Fukazawa; Asami Hayato; Joanne E Hill; Wataru B Iwakiri; Keith Jahoda; Philip Kaaret; Ross McCurdy; Tsunefumi Mizuno; Toshio Nakano; Toru Tamagawa

doi:10.1016/j.nima.2017.10.070

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An optimized photoelectron track reconstruction method for photoelectric X-ray polarimeters

Journal article

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An optimized photoelectron track reconstruction method for photoelectric X-ray polarimeters

Takao Kitaguchi, Kevin Black, Teruaki Enoto, Yasushi Fukazawa, Asami Hayato, Joanne E Hill, Wataru B Iwakiri, Keith Jahoda, Philip Kaaret, Ross McCurdy, …

Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, Vol.880, pp.188-193

02/01/2018

DOI: 10.1016/j.nima.2017.10.070

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Abstract

We present a data processing algorithm for angular reconstruction and event selection applied to 2-D photoelectron track images from X-ray polarimeters. The method reconstructs the initial emission angle of a photoelectron from the initial portion of the track, which is obtained by continuously cutting a track until the image moments or number of pixels fall below tunable thresholds. In addition, event selection which rejects round tracks quantified with eccentricity and circularity is performed so that polarimetry sensitivity considering a trade-off between the modulation factor and signal acceptance is maximized. The modulation factors with applying track selection are 26.6±0.4, 46.1±0.4, 62.3±0.4, and 61.8±0.3% at 2.7, 4.5, 6.4, and 8.0 keV, respectively, using the same data previously analyzed by Iwakiri et al. (2016), where the corresponding numbers are 26.9±0.4, 43.4±0.4, 54.4±0.3, and 59.1±0.3%. The method improves polarimeter sensitivity by 5%–10% at the high energy end of the band previously presented (Iwakiri et al. 2016).

Photoelectric polarimeter

Polarimetry

Time projection chamber

Tracking algorithm

X-ray

Details

Title: Subtitle: An optimized photoelectron track reconstruction method for photoelectric X-ray polarimeters
Creators: Takao Kitaguchi - Hiroshima University
Kevin Black - Goddard Space Flight Center
Teruaki Enoto - Kyoto University
Yasushi Fukazawa - Hiroshima University
Asami Hayato - RIKEN Nishina Center
Joanne E Hill - Goddard Space Flight Center
Wataru B Iwakiri - RIKEN
Keith Jahoda - Goddard Space Flight Center
Philip Kaaret - University of Iowa
Ross McCurdy - University of Iowa
Tsunefumi Mizuno - Hiroshima University
Toshio Nakano - RIKEN Nishina Center
Toru Tamagawa - RIKEN Nishina Center
Resource Type: Journal article
Publication Details: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, Vol.880, pp.188-193
DOI: 10.1016/j.nima.2017.10.070
ISSN: 0168-9002
eISSN: 1872-9576
Publisher: Elsevier B.V
Grant note: name: BNL-NSLS; name: JSPS KAKENHI, award: JP16H02198
Language: English
Date published: 02/01/2018
Academic Unit: Physics and Astronomy
Record Identifier: 9984199817602771

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