Investigation of HV Power Supply for GEM Detector in High Dose Rate

WEI Kun; QI Huirong; ZHANG Yulian; WEN Zhiwen; ZHANG Jian; OUYANG Qun

doi:10.11804/NuclPhysRev.32.03.335

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Article Navigation > Nuclear Physics Review > 2015 > 32(3): 335-340

WEI Kun, QI Huirong, ZHANG Yulian, WEN Zhiwen, ZHANG Jian, OUYANG Qun, . Investigation of HV Power Supply for GEM Detector in High Dose Rate[J]. Nuclear Physics Review, 2015, 32(3): 335-340. doi: 10.11804/NuclPhysRev.32.03.335

Citation:

WEI Kun, QI Huirong, ZHANG Yulian, WEN Zhiwen, ZHANG Jian, OUYANG Qun, . Investigation of HV Power Supply for GEM Detector in High Dose Rate[J]. Nuclear Physics Review, 2015, 32(3): 335-340. doi: 10.11804/NuclPhysRev.32.03.335

Investigation of HV Power Supply for GEM Detector in High Dose Rate

doi: 10.11804/NuclPhysRev.32.03.335

School of Nuclear Science and Technology, University of Lanzhou, Lanzhou 730000 China;
State Key Laboratory of Particle Detection and Electronics, Beijing 100049, China;
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2015-09-20

Abstract

There are two methods of the HV power supply for the GEM detector. One is a HV channel divided by the resistive chain and the other is the several separate HV channels. In the smaller dose rate of X-ray, all of the methods are similar. When the dose rate increases, the resistive chain-dividing mode has more obvious saturation effect and the working voltage of the GEM detector is unstable. In the paper, a GEM detector with an effective area of 100 mm100 mm has been studied in the high dose rate using X-tube. The unit values in the divider resistance chain are set to 1, 2, 5 and 30 MΩ respectively in the test. With the resistive chain-dividing mode, the readout current of the GEM detector’s anode tends to saturate when the dose rate of X-ray increases,and the reasons of the saturation effect are analyzed. The results indicate that the effective absorbed dose of X-ray by the triple GEMs detector reaches to the pecific value and the divider resistance needs to re-select, even the several separate HV channels mode should be considered. It will keep the constant of the working voltage of the GEM detector without the saturation effect and gain variation and the performance of GEM detector is stable.
- GEM detector,
- high voltage power supply method,
- X-ray,
- high dose rate
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Investigation of HV Power Supply for GEM Detector in High Dose Rate

doi: 10.11804/NuclPhysRev.32.03.335

School of Nuclear Science and Technology, University of Lanzhou, Lanzhou 730000 China;

State Key Laboratory of Particle Detection and Electronics, Beijing 100049, China;

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2015-09-20

Key words:

Abstract: There are two methods of the HV power supply for the GEM detector. One is a HV channel divided by the resistive chain and the other is the several separate HV channels. In the smaller dose rate of X-ray, all of the methods are similar. When the dose rate increases, the resistive chain-dividing mode has more obvious saturation effect and the working voltage of the GEM detector is unstable. In the paper, a GEM detector with an effective area of 100 mm100 mm has been studied in the high dose rate using X-tube. The unit values in the divider resistance chain are set to 1, 2, 5 and 30 MΩ respectively in the test. With the resistive chain-dividing mode, the readout current of the GEM detector’s anode tends to saturate when the dose rate of X-ray increases,and the reasons of the saturation effect are analyzed. The results indicate that the effective absorbed dose of X-ray by the triple GEMs detector reaches to the pecific value and the divider resistance needs to re-select, even the several separate HV channels mode should be considered. It will keep the constant of the working voltage of the GEM detector without the saturation effect and gain variation and the performance of GEM detector is stable.

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