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http://hdl.handle.net/20.500.12386/24021
Titolo: | Assembly and test of the gas pixel detector for X-ray polarimetry | Autori: | Li, H. Feng, H. MULERI, FABIO Bellazzini, R. Minuti, M. SOFFITTA, PAOLO Brez, A. Spandre, G. Pinchera, M. Sgró, C. Baldini, L. She, R. Costa, E. |
Data pubblicazione: | 2015 | Rivista: | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT | Numero: | 804 | Da pagina:: | 155 | 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. | Acknowledgments: | 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. | URI: | http://hdl.handle.net/20.500.12386/24021 | URL: | https://www.sciencedirect.com/science/article/pii/S0168900215011158?via%3Dihub | ISSN: | 0168-9002 | DOI: | 10.1016/j.nima.2015.09.060 | Bibcode ADS: | 2015NIMPA.804..155L | Fulltext: | open |
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