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The Chinese spallation neutron source was completed in May 2018 and then subsequently commissioned. The Back-streaming white neutron beam line can be used in neutron nuclear data measurement, neutron physics research, and nuclear technology. In these experiments, it is necessary to know the neutron energy spectrum, the neutron flux, and the neutron beam profile of the neutron beam. In this paper, we present the preliminary measurements of these parameters. The neutron energy spectrum and neutron flux are measured by the time-of-flight method with a fission chamber equipped with 235U and 238U samples and a 6Li-Si detector. The neutron beam profile is measured by a scintillator-CMOS detection system. The preliminary experimental measurements of the beam line are obtained. Among them, the energy spectrum measurement range of white neutrons is from eV to more than 100 MeV, which also gives an uncertainty analysis; the neutron fluence rate gives the full power value of the two experimental halls; the collimated white neutron beam spot is given under a diameter of 60 mm. The future plan is also given. The results of these experimental parameters can serve as the foundation for the future nuclear data measurement and detector calibration experiments of the beam line.
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Keywords:
- China spallation neutron source /
- back-streaming white neutron /
- neutron time-of-flight method /
- neutron beam characterization
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Wang Q, Bao J, Hou L, Ruan X C, Su X B, Jing H T, Li Q 2015 J. Nucl. Tech. 38 100403
[20] 栾广源, 王琦, 鲍杰, 阮锡超, 任杰, 敬罕涛, 张凯, 黄翰雄 2017 核技术 40 110501
Luan G Y, Wang Q, Bao J, Ruan X C, Ren J, Jing H T, Zhang K, Huang H X 2017 J. Nucl. Tech 40 110501
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图 1 CSNS装置布局及其反角白光中子源
Figure 1. Arrangement of back-streaming neutron beam at CSNS
图 2 一个脉冲内的两种供束模式
Figure 2. Two kinds of operation modes.
图 3 蒙特卡罗模拟得到的反角出射的散裂中子能谱
Figure 3. Stimulated neutron energy spectrum of back-streaming beam.
图 4 多层快裂变室
Figure 4. The multi layer fission chamber.
图 5 MSI-8的输出信号
Figure 5. The output signal of MSI-8 module.
图 6 裂变室的时间信号
Figure 6. The time signal of the fission chamber.
图 7 过零定时效果示意
Figure 7. Zero-crossing time determination of signal.
图 8 有效裂变信号的飞行时间确定示意图
Figure 8. Time determination from fission signal.
图 9 中子飞行时间谱
Figure 9. Neutron time-of-flight spectrum.
图 10 6Li-Si 探测器结构
Figure 10. 6Li-Si Detector structure.
图 11 实验测得的CSNS 反角白光中子能谱
Figure 11. Experimental result of back-streaming white neutron energy spectrum.
图 12 中子束剖面测量装置
Figure 12. Neutron profile measurement equipment.
图 13 探测器触发时间关系
Figure 13. Timing-serial of neutron profile detection.
图 14 中子束斑剖面分布及其在x轴和y轴上的灰度值分布
Figure 14. Neutron profile distribution and grey scale information on x and y axis
图 15 60 mm直径束斑模拟
Figure 15. Simulation of neutron profile in 60 mm diameter.
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[1] Tang J Y, Fu S N, Jing H T, Tang H Q, Wei J, Xia H H 2010 Chin. Phys. C 34 121
Google Scholar
[2] Jing H T, Tang J Y, Tang H Q, Xia H H, Liang T J, Zhou Z Y, Zhong Q P, Ruan X C 2010 Nucl. Instr. Meth. A 621 91
Google Scholar
[3] 唐靖宇, 敬罕涛, 夏海鸿, 唐洪庆, 张闯, 周祖英, 阮锡超, 张奇玮, 杨征 2013 原子能科学技术 47 47−1089
Tang J Y, Jing H T, Xia H H, Tang H Q, Zhang C, Zhou Z Y, Ruan X C, Zhang Q W, Yang Z 2013 J. Atom. Ener. 47 47−1089
[4] Wei J, Chen H, Chen Y, et al. 2009 Nucl. Instr. Meth. A 600 10
Google Scholar
[5] An Q, Bai H Y, Bao J, et al. 2017 J. Instr. 12 1748
Google Scholar
[6] Zhang L Y, Jing H T, Tang J Y, Wang X Q 2016 Radi. Phys. Chem. 127 133
Google Scholar
[7] 张利英 2018 博士学位论文 (合肥: 中国科学技术大学)
Zhang L Y 2018 Ph. D. Dissertation (Hefei: University of Science and Technology of China) (in Chinese)
[8] Zhang L Y, Jing H T, Tang J Y, et al. 2018 Appl. Radi. Iso. 132 212
Google Scholar
[9] 刘圣康 1986 中子物理 (北京: 原子能出版社) 第21−25页
Liu S K 1986 Neutron Physics (Beijing: Atomic Energy Press) pp21−25 (in Chinese)
[10] Marrone S, Mastinu P F, Abbondanno U, et al. 2004 Nucl. Instr. Meth. A 517 389
Google Scholar
[11] Colonna N, Andriamonje S, Andrzejewski J, et al. 2011 Nucl. Instr. Meth. B 269 3251
Google Scholar
[12] Guerrero C, Becares V, Cano-Ott D, et al. 2010 International Conference on Nuclear Data for Science and Technology, Korea Jeju Island, Korea, April 26−30, 2010
[13] Beyer R, Birgersson E, Elekes Z, Ferrari A, Grosse E, Hannaske R, Junghans A R, Kögler T, Massarczyk R, Matic A, Nolte R, Schwengner R, Wagner A 2013 Nucl. Instr. Meth. A 723 151
[14] Kino K, Furusaka M, Hiraga F, et al. 2011 Nucl. Instr. Meth. A 626-627 58
[15] Calviani M, Cennini P, Karadimos D, et al. 2008 Nucl. Instr. Meth. A 594 220
Google Scholar
[16] Savvidis I, Lampondis C, Papaevangelou T, et al. 2007 Radi. Meas. 42 1492
Google Scholar
[17] Weiss C 2010 Ph. D. Dissertation (Wien: Atominstitut der österreichischen Universitäten)
[18] Gayther D B 1990 J. Metrologia 27 221
Google Scholar
[19] 王琦, 鲍杰, 侯龙, 阮锡超, 苏晓斌, 敬罕涛, 李强 2015 核技术 38 100403
Wang Q, Bao J, Hou L, Ruan X C, Su X B, Jing H T, Li Q 2015 J. Nucl. Tech. 38 100403
[20] 栾广源, 王琦, 鲍杰, 阮锡超, 任杰, 敬罕涛, 张凯, 黄翰雄 2017 核技术 40 110501
Luan G Y, Wang Q, Bao J, Ruan X C, Ren J, Jing H T, Zhang K, Huang H X 2017 J. Nucl. Tech 40 110501
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