Back-n white neutron facility for nuclear data measurements at CSNS

Qi An(University of Science and Technology of China), Huitao Bai(Peking University), Jie Bao(China Institute of Atomic Energy), Ping Cao(University of Science and Technology of China), Yongzhen Chen(University of Science and Technology of China), Y.L. Chen(University of Science and Technology of China), P.J. Cheng(University of South China), Ruirui Fan(China Spallation Neutron Source), C. Q. Feng(University of Science and Technology of China), J. Gu(China Spallation Neutron Source), M. H. Gu(Institute of High Energy Physics), Bing He(University of Science and Technology of China), Guangzhi He(China Institute of Atomic Energy), Wei He(China Spallation Neutron Source), Y.C. He(China Spallation Neutron Source), Yuefeng He(China Spallation Neutron Source), Han‐Xiong Huang(China Institute of Atomic Energy), Xiru Huang(University of Science and Technology of China), Weiqi Huang(China Spallation Neutron Source), Xiuling Ji(University of Science and Technology of China), Xuyang Ji(University of Science and Technology of China), Hantao Jing(China Spallation Neutron Source), B. Li(China Spallation Neutron Source), C.B. Li(University of Science and Technology of China), Gary Li(China Spallation Neutron Source), Q. Li(China Spallation Neutron Source), Ye Li(Institute of High Energy Physics), Rouzhi Liu, S.B. Liu(University of Science and Technology of China), Guangyuan Luan(China Institute of Atomic Energy), Y. L.(China Spallation Neutron Source), M. Peng(China Institute of Atomic Energy), Changjun Ning(China Spallation Neutron Source), Xin Qi(University of Science and Technology of China), Jie Ren(China Institute of Atomic Energy), Xichao Ruan(China Institute of Atomic Energy), Bin Shi(China Institute of Atomic Energy), Zhendi Song(Northwest Institute of Nuclear Technology), Xiaowen Su(University of Science and Technology of China), Z. J. Sun(China Spallation Neutron Source), Haiqian Tang(China Institute of Atomic Energy), Jingyu Tang(China Spallation Neutron Source), Zhixin Tan(China Spallation Neutron Source), P.C. Wang(China Spallation Neutron Source), Qi Wang(University of Science and Technology of China), Qi Wang(University of Science and Technology of China), Yan Wang(China Spallation Neutron Source), Z.H. Wang(China Institute of Atomic Energy), Jie Wen, Z. Wen, Qingbiao Wu(China Spallation Neutron Source), Xinji Wu(China Institute of Atomic Energy), Yang Yi, Tao Yu(University of Science and Technology of China), Yaxin Yu(China Spallation Neutron Source), Deliang Zhang(University of Science and Technology of China), G.H. Zhang(Peking University), Yinhong Zhang(Institute of High Energy Physics), Jing Zhang(China Spallation Neutron Source), L.Y. Zhang(University of Science and Technology of China), Q.W. Zhang(China Institute of Atomic Energy), X.P. Zhang(Northwest Institute of Nuclear Technology), Yuexin Zhang(University of Science and Technology of China), Yaru Zhao(Xi'an Jiaotong University), Lei Zheng, Yun Zheng(China Institute of Atomic Energy), Jiayong Zhong(China Institute of Atomic Energy), Qiyong Zhong(China Institute of Atomic Energy), Liang Zhou(China Spallation Neutron Source), Z. Y. Zhou(China Institute of Atomic Energy), Kejun Zhu(Institute of High Energy Physics)
Journal of Instrumentation
July 25, 2017
10.1088/1748-0221/12/07/p07022
Cited by 90

Abstract

Back-streaming neutrons through the incoming proton channel at the spallation target station of China Spallation Neutron Source (CSNS) has been exploited as a white neutron beam line (so-called Back-n), and a number of spectrometers for nuclear data measurements have been planned. With a thick tungsten target and modest moderation by the cooling water through the target slices, the neutron beam is very intense which is in the order of 5.0×106 n/cm2/s at 80 m from the target and has an excellent energy spectrum spanning from 1 eV to 100 MeV. In addition, the time structure of the primary proton beam under different accelerator operation modes is fully applicable for time-of-flight measurements. Altogether, it makes the CSNS Back-n very much suitable for nuclear data measurements. The construction of the neutron beam line and five of the seven planned spectrometers are under way. It is expected that the first batch experiments be carried out from late 2017, when CSNS starts commissioning.

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