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Proceedings Paper

Effect of a magnetic field generated by permanent magnets on the GPD polarization sensitivity
Author(s): Paolo Soffitta; Enrico Costa; Alfredo Morbidini; Fabio Muleri; Alda Rubini; Daniele Spiga; Ronaldo Bellazzini; Alessandro Brez; Luca de Ruvo; Massimo Minuti; Michele Pinchera; Gloria Spandre
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Paper Abstract

The Gas Pixel Detector (GPD) is an imaging X-ray polarimeter with a moderate spectral resolution and a very good position resolution.1, 2 The GPD derives this information from the true 2-d charge image of the photoelectron track produced in gas and collected by an ASIC CMOS chip after its drift and its multiplication. In this paper we report on the experimental results of the study of the effect of a strong magnetic field in reducing the diffusion and increasing the sensitivity for a GPD filled with one bar of He-DME 20-80. We generated a magnetic field of about 1600 Gauss by means of commercial magnets made of an alloy of Neodymium-Iron-Boron configured as one ring and one cylinder. We compared the pixel size distributions and the modulation curves with and without magnets at two different drift fields, corresponding to different nominal diffusion properties, with both polarized and unpolarized sources. The results obtained show that a not sensitive improvement is present at this fields implying that a much larger magnetic field is necessary with this mixture, albeit a shift on the position angle of the modulation curve, derived from a polarized source, is observed.

Paper Details

Date Published: 24 July 2014
PDF: 9 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91444P (24 July 2014); doi: 10.1117/12.2069867
Show Author Affiliations
Paolo Soffitta, INAF - Istituto di Astrofisica e Planetologia Spaziali (Italy)
Enrico Costa, INAF - Istituto di Astrofisica e Planetologia Spaziali (Italy)
Alfredo Morbidini, INAF - Istituto di Astrofisica e Planetologia Spaziali (Italy)
Fabio Muleri, INAF - Istituto di Astrofisica e Planetologia Spaziali (Italy)
Alda Rubini, INAF - Istituto di Astrofisica e Planetologia Spaziali (Italy)
Daniele Spiga, INAF - Osservatorio Astronomico di Brera (Italy)
Ronaldo Bellazzini, INFN (Italy)
Alessandro Brez, INFN (Italy)
Luca de Ruvo, INFN (Italy)
Massimo Minuti, INFN (Italy)
Michele Pinchera, INFN (Italy)
Gloria Spandre, INFN (Italy)


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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