15 July 2008 The gas pixel detector as an x-ray photoelectric polarimeter with a large field of view
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The Gas Pixel Detector (GPD) is a new generation device which, thanks to its 50 μm pixels, is capable of imaging the photoelectrons tracks produced by photoelectric absorption in a gas. Since the direction of emission of the photoelectrons is strongly correlated with the direction of polarization of the absorbed photons, this device has been proposed as a polarimeter for the study of astrophysical sources, with a sensitivity far higher than the instruments flown to date. The GPD has been always regarded as a focal plane instrument and then it has been proposed to be included on the next generation space-borne missions together with a grazing incidence optics. Instead in this paper we explore the feasibility of a new kind of application of the GPD and of the photoelectric polarimeters in general, i.e. an instrument with a large field of view. By means of an analytical treatment and measurements, we verify if it is possible to preserve the sensitivity to the polarization for inclined beams, opening the way for the measurement of X-ray polarization for transient astrophysical sources. While severe systematic effects arise for inclination greater than about 20 degrees, methods and algorithms to control them are discussed.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Fabio Muleri, Fabio Muleri, Paolo Soffitta, Paolo Soffitta, Ronaldo Bellazzini, Ronaldo Bellazzini, Alessandro Brez, Alessandro Brez, Enrico Costa, Enrico Costa, Sergio Fabiani, Sergio Fabiani, Massimo Frutti, Massimo Frutti, Massimo Minuti, Massimo Minuti, Maria Barbara Negri, Maria Barbara Negri, Michele Pinchera, Michele Pinchera, Alda Rubini, Alda Rubini, Gloria Spandre, Gloria Spandre, "The gas pixel detector as an x-ray photoelectric polarimeter with a large field of view", Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70112A (15 July 2008); doi: 10.1117/12.789621; https://doi.org/10.1117/12.789621


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