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Proceedings Paper

A concept for a high-energy gamma-ray polarimeter
Author(s): Peter Forbes Bloser; Stanley D. Hunter; Gerardo O. Depaola; Francesco Longo
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Paper Abstract

We present a concept for an imaging gamma-ray polarimeter operating from ~50 MeV to ~1 GeV. Such an instrument would be valuable for the study of high-energy pulsars, active galactic nuclei, supernova remnants, and gamma-ray bursts. The concept makes use of pixelized gas micro-well detectors, under development at Goddard Space Flight Center, to record the electron-positron tracks from pair-production events in a large gas volume. Pixelized micro-well detectors have the potential to form large-volume 3-D track imagers with ~100 μm (rms) position resolution at moderate cost. The combination of high spatial resolution and a continuous low-density gas medium permits many thousands of measurements per radiation length, allowing the particle tracks to be imaged accurately before multiple scattering masks their original directions. The polarization of the incoming radiation may then be determined from the azimuthal distribution of the electron-positron pairs. We have performed Geant4 simulations of these processes to estimate the polarization sensitivity of a simple telescope geometry at 100 MeV.

Paper Details

Date Published: 3 February 2004
PDF: 12 pages
Proc. SPIE 5165, X-Ray and Gamma-Ray Instrumentation for Astronomy XIII, (3 February 2004); doi: 10.1117/12.505838
Show Author Affiliations
Peter Forbes Bloser, NASA Goddard Space Flight Ctr. (United States)
Stanley D. Hunter, NASA Goddard Space Flight Ctr. (United States)
Gerardo O. Depaola, Univ. Nacional de Cordoba (Argentina)
Francesco Longo, Univ. degli Studi di Trieste (Italy)
INFN (Italy)

Published in SPIE Proceedings Vol. 5165:
X-Ray and Gamma-Ray Instrumentation for Astronomy XIII
Kathryn A. Flanagan; Oswald H. W. Siegmund, Editor(s)

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