X-ray polarimetry with an active-matrix pixel proportional counter

Details X-ray polarimetry with an active-matrix pixel proportional counter X-ray polarimetry with an active-matrix pixel proportional counter

2003-03-27

arxiv.org/abs/physics/0303114v1

Nucl.Instrum.Meth. A513 (2003) 639-643

Physics

Instrumentation and Detectors

4 pages, 4 figures, 1 table

Scientific paper

We report the first results from an X-ray polarimeter with a micropattern gas proportional counter using an amorphous silicon active matrix readout. With 100% polarized X-rays at 4.5 keV, we obtain a modulation factor of 0.33 +/- 0.03, confirming previous reports of the high polarization sensitivity of a finely segmented pixel proportional counter. The detector described here has a geometry suitable for the focal plane of an astronomical X-ray telescope. Amorphous silicon readout technology will enable additional extensions and improvements.

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