X-ray Polarimetry - INAF-IASF-Roma

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X-<strong>ray</strong> polarimetry with a Gas Pixel Detector To efficiently image the track <strong>IASF</strong>-Rome and INFN-Pisa developed the Gas Pixel detector since 2001. The gas allows for having tracks enough long to be imaged. The principle of detection A photon cross a Beryllium window and it is absorbed in the gas gap, the photoelectron produces a track. The track drifts toward the multiplication stage that is the GEM (Gas Electron Multiplier) which is a kapton foil metallized on both side and perforated by microscopic holes (30 um diameter, 50 um pitch) and it is then collected by the pixellated anode plane. GEM electric field X photon (E) conversion gain collection pixel GEM PCB Polarization information is derived from the angular distribution of the tracks produced by the photoelectrons, imaged by a finely subdivided gas detector. 20 ns a E Costa et al., 2001 Paolo Soffitta The Extreme and Variable High Energy Sky Chia Laguna 19-21/09/2011
POLARIX The missions where the GPD was proposed either are waiting after a phase A completed or were not selected or evolved in missions without anymore a polarimeter onboard. Costa et al., ExpAst 2010 NHXM IXO Bookbinder, SPIE, 2010 Tagliaferri et al, ExpAst 2010 Paolo Soffitta The Extreme and Variable High Energy Sky Chia Laguna 19-21/09/2011
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X-ray Polarimetry - INAF-IASF-Roma

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