Photoelectric X-ray Polarimetry using Time Projection Chambers

Details Photoelectric X-ray Polarimetry using Time Projection Chambers Photoelectric X-ray Polarimetry using Time Projection Chambers

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.2815j&link_type=abstract

American Astronomical Society, HEAD meeting #10, #28.15

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

The promise of photoelectric X-ray polarimetry has now been realized in laboratory demonstrations and may soon be used for astrophysical observations. Photoelectric polarimetry in gas filled proportional counters achieves high sensitivity through a combination of broad band width and good modulation. The band can be tuned by careful choice of gas composition and pressure. The measurements rely on imaging the tracks of photoelectrons. The initial direction of each track carries information about the electric field of the X-ray photon, and an ensemble of such measurements thus measures the net polarization of the source. The use of Time Projection Chambers (TPC) allows deep, high efficiency, detectors. Polarimeters which exploit the TPC geometry can be optimized for use behind telescopes, to study faint persistent sources, or as wide field of view instruments, designed to study bright transient events such as gamma-ray bursts or solar flares. We present the conceptual design of both types of TPC polarimeter. Recent laboratory results demonstrate that these polarimeters can achieve substantial gains in the polarization sensitivity of experiments of modest size.

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