Assembly and test of the gas pixel detector for X-ray polarimetry
Date Issued
2015
Author(s)
Li, H.
•
Feng, H.
•
•
Bellazzini, R.
•
Minuti, M.
•
•
Brez, A.
•
Spandre, G.
•
Pinchera, M.
•
Sgró, C.
•
Baldini, L.
•
She, R.
•
Description
Acknowledgements H.F. acknowledges funding support from the National Natural Science Foundation of China under Grant no. 11222327 , and the Tsinghua University Initiative Scientific Research Program.
Abstract
The gas pixel detector (GPD) dedicated for photoelectric X-ray polarimetry is selected as the focal plane detector for the ESA medium-class mission concept X-ray Imaging and Polarimetry Explorer (XIPE). Here we show the design, assembly, and preliminary test results of a small GPD for the purpose of gas mixture optimization needed for the phase A study of XIPE. The detector is assembled in house at Tsinghua University following a design by the INFN-Pisa group. The improved detector design results in a good uniformity for the electric field. Filled with pure dimethyl ether (DME) at 0.8 atm, the measured energy resolution is 18% at 6 keV and inversely scales with the square root of the X-ray energy. The measured modulation factor is well consistent with that from simulation, up to ~0.6 above 6 keV. The residual modulation is found to be 0.30 ± 0.15 % at 6 keV for the whole sensitive area, which can be translated into a systematic error of less than 1% for polarization measurement at a confidence level of 99%. The position resolution of the detector is about 80 μm in FWHM, consistent with previous studies and sufficient for XIPE requirements.
Volume
804
Start page
155
Issn Identifier
0168-9002
Ads BibCode
2015NIMPA.804..155L
Rights
open.access
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