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Proceedings Paper

Performance of an Ar-DME imaging photoelectric polarimeter
Author(s): S. Fabiani; R. Bellazzini; F. Berrilli; A. Brez; E. Costa; M. Minuti; F. Muleri; M. Pinchera; A. Rubini; P. Soffitta; G. Spandre
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Paper Abstract

The possibility to perform polarimetry in the soft X-ray energy band (2-10 keV) with the Gas Pixel Detector, filled with low Z mixtures, has been widely explored so far. The possibility to extend the technique to higher energies, in combination with multilayer optics, has been also hypothesized in the past, on the basis of simulations. Here we present a recent development to perform imaging polarimetry between 6 and 35 keV, employing a new design for the GPD, filled with a Ar-DME gas mixture at high pressure. In order to improve the efficiency by increasing the absorption gap, while preserving a good parallel electric field, we developed a new configuration characterized by a wider gas cell and a wider GEM. The uniform electric field allows to maintain high polarimetric capabilities without any decrease of spectroscopic and imaging properties. We present the first measurements of this prototype showing that it is now possible to perform imaging and spectro-polarimetry of hard X-ray sources.

Paper Details

Date Published: 17 September 2012
PDF: 13 pages
Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84431C (17 September 2012); doi: 10.1117/12.925374
Show Author Affiliations
S. Fabiani, INAF/IAPS Roma (Italy)
Univ. degli Studi di Roma Tor Vergata (Italy)
R. Bellazzini, INFN (Italy)
F. Berrilli, Univ. degli Studi di Roma Tor Vergata (Italy)
A. Brez, INFN (Italy)
E. Costa, INAF/IAPS Roma (Italy)
M. Minuti, INFN (Italy)
F. Muleri, INAF/IAPS Roma (Italy)
M. Pinchera, INFN (Italy)
A. Rubini, INAF/IAPS Roma (Italy)
P. Soffitta, INAF/IAPS Roma (Italy)
G. Spandre, INFN (Italy)

Published in SPIE Proceedings Vol. 8443:
Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Stephen S. Murray; Jan-Willem A. den Herder, Editor(s)

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