The research of laser-based rapid measurement system for scintillator neutron detectors arrays

Radiation Detection Technology and Methods - Tập 4 - Trang 400-406 - 2020
Bin Tang1,2, Qian Yu1,2,3, Chan Huang4, Hai-yun Teng1,2, Yan-feng Wang1,2, Hong Xu1,2, Yun-tao Liu1,2, Lin Qiu5, Guang-you Wei6, Zhi-jia Sun1,2,7
1Institute of High Energy Physics, China Academy of Sciences, Beijing, China
2Spallation Neutron Source Science Center, Dongguan, China
3University of Chinese Academy of Sciences (UCAS), Beijing, China
4School of Nuclear Science and Technology, University of Lanzhou, Lanzhou, China
5Fundamental Science on Nuclear Waste and Environmental Security Laboratory, Southwest University of Science and Technology, Mianyang, China
6Department of Nuclear Science and Technology, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, China
7State Key Laboratory of Particle Detection and Electronics, Beijing, China

Tóm tắt

Scintillator Neutron Detectors Arrays (SNDA) were successfully installed at General Purpose Powder Diffractometer (GPPD) at the China Spallation Neutron Source (CSNS). The inhomogeneity of the detection efficiency in each detector module, which caused by the gain nonuniformity of the multi-anode photo-multiplier tubes (MA-PMTs) and the inconsistency of the wave-length shifting fibers in collecting scintillation photons, need to be mitigated before the installation. An automated rapid measurement system based on the blue laser and the two-dimensional mobile platform was developed to calibrate the light response of each channel in detector modules. According to the test results of this system, the electronics threshold of each channel of the SNDA is adjusted. Before the installation of the all 40 SNDA modules in GPPD, the electronics thresholds of each channel are adjusted according to the measurement results of this rapid measurement system. Compared with the unadjusted detector module, the adjusted one obtained a better uniformity of the neutron detection efficiency. The inhomogeneity of the detection efficiency is improved from 27.4% to 10.9%. The test result of the diffraction peak of the standard sample Si showed that the adjusted SNDA works well in GPPD.

Tài liệu tham khảo

J. Wei, H. Chen et al., china spallation neutron source: design, R&D, and outlook. Nucl. Instrum. Methods A 600, 10–13 (2009) T.A.N.G. Bin, S.U.N. Zhi-Jia et al., Study of a position-sensitive scintillator neutron detector. Chin. Phys. C (HEP&NP) 36(11), 1089–1094 (2012) C.L. Wang, R.A. Riedel, Uniformity measurements and new positioning algorithms for wavelength-shifting fiber neutron detectors. Nucl. Instrum. Methods A 751, 55–61 (2014) Yun Ho Kim, Hyeonseo Park, et al, Reference thermal neutron field at KRISS for calibration of neutron detectors. Radiat. Meas. 107, 73–79 (2017) R. Bugiel, S. Bugiel, D. Dannheim et al., Test-beam results of a SOI pixel-detector prototype. Nucl. Instrum. Methods A 901, 173–179 (2018) Mesytec GmbH & Co. KG, MQDC-32 feature. Available at https://www.mesytec.com/products/nuclear-physics/MQDC-32.html. Accessed 2018 Omicron-Laserage Laserprodukte GmbH LuxX+® 375-20 Diode Laser, Long term power stability. Available at http://www.omicron-laser.de/english/lasers/diode-lasers/luxx-lasers-/luxx-plus-diode-lasers.html Xu Yao, G. Ren, Y. Jiang, Wu Yue, W. Jin, Ya Shen, S. Jian, Twisting effect on LP11 mode in optical fibers. Optik 158, 220–224 (2018) J. Nicholson, A. Yablon, S. Ramachandran, S. Ghalmi, Spatially and spectrally resolved imaging of modal content in large-mode-area fibers. Opt. Exp. 16, 7233–7243 (2008) D. Gloge, Bending loss in multimode fibers with graded and ungraded core index. Appl. Opt. 11(11), 2506–2513 (1972) D.A. Hicks, JJr Ise, R.V. Pyle, Spontaneous-fission neutrons of Californium-252 and Curium-244. Phys Rev (U.S.) 98, 1521–1523 (1955)
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Radiation Detection Technology and Methods

Tập 4

400-406

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