X-ray polarimetry with a micropattern TPC

The micropattern time projection chamber (TPC) offers a novel method of imaging the tracks of photoelectrons as a means of X-ray polarimetry with the potential to simultaneously achieve large modulation factors and high quantum efficiency. Measurements with a simple prototype micropattern TPC polari...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2007-11, Vol.581 (3), p.755-760
Main Authors: Black, J.K., Baker, R.G., Deines-Jones, P., Hill, J.E., Jahoda, K.
Format: Article
Language:English
Subjects:
GEM
Particle tracking
Pixel readout
TPC
X-ray polarimetry
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Summary:The micropattern time projection chamber (TPC) offers a novel method of imaging the tracks of photoelectrons as a means of X-ray polarimetry with the potential to simultaneously achieve large modulation factors and high quantum efficiency. Measurements with a simple prototype micropattern TPC polarimeter, with an 18 mm-atm absorption depth of a mixture of 50% neon and 50% dimethyl ether, result in a modulation factor of 45.0±0.6% with polarized 6.4 keV X-rays. With unpolarized 5.9 keV X-rays, the measured modulation factor is 0.49±0.54%, consistent with zero. The geometry of the TPC polarimeter will enable substantial improvements in quantum efficiency without the loss of modulation.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2007.08.144