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Low temperature testing and neutron irradiation of a swept charge device on board the HXMT satellite

Chinese Physics C 2012年第10期36卷 991-995页

作者：王于仨陈勇徐玉朋杨彦佶崔苇苇李茂顺刘晓艳王娟韩大炜陈田祥李承奎霍嘉李正伟李炜胡渭张艺陆波朱玥刘琰吴帝孙庆荣张子良 Key Laboratory for Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences (CAS) College of Physics Jilin University School of Physical Science and Technology Yunnan University Beijing University of Chemical Technology

We present the low temperature testing of an SCD detector, investigating its performance such as readout noise, energy resolution at 5.9 keV and dark current. The SCD’s performance is closely related to temperature, and the temperature range of 80℃ to 50℃ is the best choice, where the FWHM at 5.9 keV is about 130 eV. The influence of the neutron irradiation from an electrostatic accelerator with fluence up to 1 × 109 cm-2 has been examined. We find the SCD is not vulnerable to neutron irradiation. The detailed operations of the SCD and the test results of low temperature are reported, and the results of neutron irradiation are discussed.

关键词： SCD HXMT energy resolution readout noise neutron irradiation

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Proton irradiation effect on SCDs

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Chinese Physics C 2014年第8期38卷 60-63页

作者：杨彦佶陆景彬王于仨陈勇徐玉朋崔苇苇李炜李正伟李茂顺刘晓艳王娟韩大炜陈田祥李承奎霍嘉胡渭张艺陆波朱玥马克岩吴帝刘琰张子良尹国和王宇 College of Physics Jilin University Key Laboratory for Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences (CAS) School of Physical Science and Technology Yunnan University

The Low Energy X-ray Telescope is one of the main payloads on the Hard X-ray Modulation Telescope satellite. Swept charge devices （SCDs） are selected as detectors for the Low Energy X-ray Telescope. As SCDs are sensitive to proton irradiation, irradiation tests were carried out on the HI-13 accelerator at the China Institute of Atomic Energy. The beam energy was measured to be 10 MeV at the SCD. The proton fluence delivered to the SCD was 3×10^8protons/cm2 over two hours. By comparing the performance before and after irradiation, it is concluded that proton irradiation affects both the dark current and the charge transfer inefficiency of the SCD. The energy resolution of the proton-irradiated SCD is 212 eV@5.9 keV at -60℃, while it before irradiated is 134 eV. Moreover, better performance can be reached by lowering the operating temperature of the SCD in orbit.

关键词： SCD HXMT proton irradiation energy resolution readout noise

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