X-ray Polarimetry - INAF-IASF-Roma

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Hard X-ray photo imaging The photoelectric effect can be exploited by imaging the track produced by a photoelectron in gas Back in 1994 the optical image produced during multiplication in gas of a photoelectron was collected by a CCD at hard X-ray (54 keV). Austin et al., SPIE, 1994 Paolo Soffitta The Extreme and Variable High Energy Sky Chia Laguna 19-21/09/2011
X-ray polarimetry with a Gas Pixel Detector To efficiently image the track at energies typical of conventional telescopes IASF-Rome and INFN-Pisa developed the Gas Pixel detector. The tracks are imaged by using the charge. The principle of detection A photon cross a Beryllium window and it is absorbed in the gas gap, the GEM electric field 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 that is the upper layer of an ASIC chip. X photon (E) Costa et al., 2001, Bellazzini et al.2006, 2007 Polarization information is derived from the angular distribution of the emission direction of the tracks produced by the photoelectrons. The detector has a very good imaging capability. conversion gain collection 20 ns pixel GEM a E PCB Costa et al., 2001 Paolo Soffitta The Extreme and Variable High Energy Sky Chia Laguna 19-21/09/2011
Page 1 and 2: X-Ray Polarimetry Paolo Soffitta IA
Page 3 and 4: Bragg diffraction Bragg diffraction
Page 5 and 6: OSO-8 satellite with a dedicated Br
Page 7 and 8: Thomson Polarimeters They were the
Page 9: Modern polarimeters dedicated to X-
Page 13 and 14: The real implementation of a workin
Page 15 and 16: Each photon produces a track. From
Page 17 and 18: X-ray polarimetry with a micropatte
Page 19 and 20: GRAVITY and EXTREME MAGNETISMS SMAL
Page 21 and 22: The sensitivity to polarization of
Page 23 and 24: POLARIX The missions where the GPD
Page 25 and 26: A detector more tuned on hard X-ray
Page 27 and 28: Spectro-imaging polarimetry of PWNe
Page 29 and 30: Was the GC an AGN a few hundreds ye
Page 31 and 32: IXO: Polarimetry of extended Jets i
Page 33 and 34: For a non focal plane experiment to

X-ray Polarimetry - INAF-IASF-Roma

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