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Nondestructive technique for identifying nuclides using neutron resonance transmission analysis at csns Back-n

Nuclear Science and Techniques 2024年第1期35卷 178-187页

作者： Sheng-Da Tang Yong-Hao Chen Jing-Yu Tang Rui-Rui Fan Qiang Li Gong Li Dong Liu Zheng-Yao Jin Xing-Zhu Cui Tian-Xiang Chen Yi-Wei Yang Rong Liu Han Yi Yang Li Zhen Yang Qi An Hao-Fan Bai Jiang-Bo Bai Jie Bao Ping Cao Qi-Ping Chen Zhen Chen Zeng-Qi Cui An-Chuan Fan Chang-Qing Feng Fan-Zhen Feng Ke-Qing Gao Min-Hao Gu Chang-Cai Han Zi-Jie Han Guo-Zhu He Yong-Cheng He Yang Hong Yi-Wei Hu Han-Xiong Huang Wei-Hua Jia Hao-yu Jiang Wei Jiang Zhi-jie Jiang Ling Kang Bo Li Chao Li Jia-Wen Li Xiao Li Jie Liu Shu-Bin Liu Guang-Yuan Luan Chang-Jun Ning Bin-Bin Qi Jie Ren Zhi-Zhou Ren Xi-Chao Ruan Zhao-Hui Song Kang Sun Zhi-Xin Tan Li-Jiao Wang Peng-Cheng Wang Zhao-Hui Wang Zhong-Wei Wen Xiao-Guang Wu Xuan Wu Li-Kun Xie Yong-Ji Yu Guo-Hui Zhang Lin-Hao Zhang Mo-Han Zhang Qi-Wei Zhang Xian-Peng Zhang Yu-Liang Zhang Yue Zhang Zhi-Yong Zhang Mao-Yuan Zhao Lu-Ping Zhou Zhi-Hao Zhou Ke-Jun Zhu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Institute of High-Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China USTC Archaeometry Laboratory University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

Nondestructive and noninvasive neutron assays are essential applications of neutron techniques.Neutron resonance transmission analysis(NRTA)is a powerful nondestructive method for investigating the elemental composition of an object.The back-streaming neutron line(Back-n)is a newly built time-of-flight facility at the China Spallation Neutron Source(csns)that provides neutrons in the eV to 300 MeV range.A feasibility study of the NRTA method for nuclide identification was conducted at the csns Back-n via two test experiments.The results demonstrate that it is feasible to identify different elements and isotopes in samples using the NRTA method at Back-n.This study reveals its potential future applications.

关键词： csns White neutron beam NRTA Nuclide identification Nondestructive method

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Study on the fringe field effect of quadrupoles for csns MEBT

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Radiation Detection Technology and Methods 2023年第1期7卷 134-138页

作者： Xibao Luo Jun Peng Shinian Fu Sheng Wang Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China Spallation Neutron Source Science Center Dongguan523808China

Background Medium energy beam transport(MEBT)of the China Spallation Neutron Source matches the beam from RFQ to DTL.It is found in the beam commissioning that the fringe field effect of quadrupoles in MEBT has a great influence on matching.Purpose The aspect ratio of the quadrupoles is 1.67,which induces a strong fringing field effect,and the hard-edge model used in the design needs to be improved.Methods The slicing model was performed,and the accuracy of the quadrupole model was improved.Furthermore,to use the improved model online,based on the premise that the integral field of the quadrupole magnet remains unchanged,an equivalent transfer matrix was worked out to make the beam parameters consistent with the slicing model in the simulation.Results and conclusions In the machine study,with the new model,the beam parameters at the RFQ exit were measured,which is much closer to the RFQ design value.The MEBT lattice was redesigned based on the equivalent transfer matrix.With the new matched MEBT,the transmission rate of DTL reached 99.5%in the beam commissioning,which is increased by a factor of 3%.

关键词： csns MEBT Fringe field effect Beam matching

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Development of 3He-filled linear position-sensitive detector for neutron scattering instruments at csns

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Radiation Detection Technology and Methods 2023年第1期7卷 100-106页

作者： Lin Zhu Jian-rong Zhou Xin-feng Jiang Xiao-juan Zhou Wen-qin Yang Yuan-Guang Xia Liang Xiao Hong Luo Bei-ju Guan Yan-feng Wang Hong Xu Pei-xun Shen Hai-yun Teng Jia-jie Li Gui-an Yang Ju-ping Xu Huai-can Chen Song-lin Wang Jian Zhuang Jun-rong Zhang Wen Yin Zhi-jia Sun Yuan-bo Chen Tianjiao Liang Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Spallation Neutron Source Science Center Dongguan523803GuangdongChina University of Chinese Academy of Sciences Beijing100049China

Background Helium-3-filled linear position-sensitive detectors(LPSDs)have been widely applied to neutron scattering instruments in recent decades owing to the high detection efficiency,the excellent neutron/gamma discrimination,and the ability to construct the detector with large area coverage.More than 65%of neutron instruments at the China Spallation Neutron Source(csns)require ^(3)He LPSDs for the building of the detector system.The detector of a neutron scattering instrument is normally an array detector composed of a large number of ^(3)He LPSDs.However,no appropriate substitute detector is available for the ^(3)He LPSD for operation over a short period,and its specifications need to be customized to satisfy the requirements of different instruments.This necessitates the development of ^(3)He LPSDs with different specifications for building and upgrading the detectors of neutron scattering instruments at csns.Purpose To meet the general requirements specified by the neutron instruments at csns,a ^(3)He LPSD was developed and its performances were investigated by using the neutron beam.Methods The neutron beam experiments for this ^(3)He LPSD,including measurements of counting rate plateau curve,position calibration,and position resolution along the tube path,were carried out at the beamline-20 of csns.To evaluate its performance in the instrument operation,a detector module made of this ^(3)He LPSD has been installed in the multi-physics instrument(MPI),and the comparison test with the commercial ^(3)He LPSD has been conducted at neutron scattering experiments.Results and conclusion The experimental measurements for this ^(3)He LPSD based on the neutron beam showed that it satisfies the requirements for use in neutron scattering instruments.It reaches a plateau slope of 2.6%/100 V with a plateau range from 1750 to 1950 V and attained a minimal position resolution of 5.3 mm(FWHM),superior to the one achieved by the commercial ^(3)He LPSD.In addition,this ^(3)He LPSD detector module applied to the MPI has been

关键词： Counting rate csns LPSD Plateau curve Position resolution

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Study on the H^(-)stripping injection for the Rapid Cycling Synchrotron of the China Spallation Neutron Source

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Radiation Detection Technology and Methods 2022年第2期6卷 201-208页

作者： Ming-Yang Huang Shouyan Xu Jiaxin Chen Yue Li Sheng Wang Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

Purpose The China Spallation Neutron Source(csns)accelerator consists of an 80 MeV H^(-)Linac and a 1.6 GeV rapid cycling synchrotron(RCS).For the injection system,the H^(-)stripping scheme is adopted to inject the Linac beam to the RCS with high precision and high efficiency.The stripping process through foil plays an important role in the injection,and the related beam losses control need to be studied in detail.Methods In the beam commissioning,the parameters of the stripping foil have been studied,including:structure,material,thickness,stripping efficiency,temperature,and lifetime.The measurement results are compared with the design values and some parameters of the stripping foil are optimized.With a combination of the codes Py-ORBIT and FLUKA,the beam losses caused by the foil scattering and residual H^(-)beam are simulated in detail and then compared with the actual measurement results.Results A double-layer HBC foil is instead of a single-layer DLC foil.With an actual thickness of 103μg/cm^(2),the actual stripping efficiency is about 99.8%.The peak temperature of the main stripping foil is about 1400 K in the simulation.The foil lifetime under the design power is about 1.5 months.The beam losses caused by the foil scattering and residual H^(-)beam are the main sources of the residual doses in the injection region.Conclusion The parameters of the stripping foil have been optimized and some improvements are proposed.The simulation results of the beam losses caused by the foil scattering and residual H^(-)beam are nearly consistent with the measurement results which can provide some references for the csns-Ⅱ.

关键词： csns Injection H-stripping Stripping foil Beam loss

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Study on the effects of chromaticity and magnetic field tracking errors at csns/RCS

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Chinese Physics C 2014年第11期38卷 68-71页

作者：许守彦王生安宇文李志平 Institute of High Energy Physics (IHEP)

The Rapid Cycling Synchrotron （RCS） is a key component of the China Spallation Neutron Source （csns）. For this type of high intensity proton synchrotron, the chromaticity, space charge effects, and magnetic field tracking errors between the quadrupoles and the dipoles can induce beta function distortion and tune shift, and induce resonances. In this paper, the combined effects of chromaticity, magnetic field tracking errors and space charge on beam dynamics at csns/RCS are studied systemically. 3-D simulations with different magnetic field tracking errors are performed by using the code ORBIT, and the simulation results are compared with the case without tracking errors.

关键词： space charge chromaticity magnetic field tracking errors csns

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Optimization of the collimation system for csns/RCS with the robust conjugate direction search algorithm

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Chinese Physics C 2016年第9期40卷 171-176页

作者：纪红飞焦毅黄明阳许守彦王娜王生 Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Dongguan Institute of Neutron Science(DINS) Dongguan 523808China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

The Robust Conjugate Direction Search（RCDS） method is used to optimize the collimation system for the Rapid Cycling Synchrotron（RCS） of the China Spallation Neutron Source（csns）. The parameters of secondary collimators are optimized for a better performance of the collimation system. To improve the efficiency of the optimization, the Objective Ring Beam Injection and Tracking（ORBIT） parallel module combined with MATLAB parallel computing is used, which can run multiple ORBIT instances simultaneously. This study presents a way to find an optimal parameter combination of the secondary collimators for a machine model in preparation for csns/RCS commissioning.

关键词： csns RCDS collimation system optimization parallel computing

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An overview of design for csns/RCS and beam transport

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Science China(Physics,Mechanics & Astronomy) 2011年第S2期54卷 239-244页

作者： WANG Sheng AN YuWen FANG ShouXian HUANG Nan LIU WeiBin LIU YuDong QIN Qing QIU Jing WANG Na XU Gang XU ShouYan YU ChengHui Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

The China Spallation Neutron Source (csns) is the first accelerator-based pulsed neutron source in China. Its accelerators are made up of an 80 MeV H- linac, a Rapid Cycling Synchrotron (RCS) and two beam transport lines. RCS accumulates and accelerates protons to the design energy of 1.6 GeV, and extracts high energy beam to strike the target. The overview of RCS is presented, and the key problems of the physics design are discussed. The two beam transport lines, from linac to RCS and from RCS to the target, are also introduced.

关键词： csns high intensity accelerators rapid cycling synchrotron beam loss

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Study on space charge effects of the csns/RCS

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Chinese Physics C 2011年第12期35卷 1152-1158页

作者：许守彦王生 Institute of High Energy Physics Chinese Academy of Sciences

The Rapid Cycling Synchrotron （RCS） is a key component of the China Spallation Neutron Source （csns）. The space charge effect is one of the most important issues in the csns/RCS, which limits the maximum beam intensity, as well as the maximum beam power. Space charge effects are the main source of emittance growth and beam loss in the RCS. Space charge effects have been studied by simulation for the csns/RCS. By optimizing the painting orbit, the optimized painting distribution was obtained. The space charge effects during the acceleration are studied and dangerous resonances, which may induce emktance growth and beam loss, are investigated. The results are an important reference for the design and commissioning of the csns/RCS.

关键词： space churge injection emittance growth csns

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A possible scheme for the surface muon beamline at csns

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Nuclear Science and Techniques 2019年第11期30卷 21-29页

作者： Lu-Ping Zhou Qi-Li Mu Han-Tao Jing Jing-Yu Tang Yu Bao Ying-Peng Song University of Chinese Academy of Sciences Beijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China University of Science and Technology of China Hefei 230026China Jilin University Changchun 130012China

An experimental muon source is planned for the China Spallation Neutron Source.A simplified beamline with a limited number of magnets is achieved using a FODO lattice for implementation in a future preliminary stage.The yield of the muon delivered to the experimental sample is slightly larger than 10^5 μ^+/s within the FWHM beam spot(-φ30 mm)from a thick muon target.In addition,the beam polarization is 92%and the contamination that is mainly formed by positrons is approximately a fraction of 1%.

关键词： csns Polarized muon beamline Carbon target FODO lattice

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Updating the csns injector linac to 250 MeV with superconducting double-spoke cavities

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Chinese Physics C 2015年第3期39卷 71-76页

作者：李智慧傅世年 The Key Labratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and Technology Sichuan University Institute of High Energy Physics Chinese Academy of Sciences

In order to update the beam power from 100 kW to 500 kW in the China Spallation neutron source （csns） Phase II, one of the important measures is to replace the 80 m long beam transport line between the present 80 MeV linac injector and the rapid cycling synchrotron （RCS） to another kind of acceleration structure. In this paper, we proposed a scheme based on 324 MHz double-spoke superconducting cavities. Unlike the superconducting elliptical cavity and normal conducting coupled cavity linac （CCL） structure, the double-spoke cavity belongs to the TE mode structure and has a smaller transverse dimension compared with that of the TH mode one. It can work at base frequency as the drift tube Linac （DTL） section, so that the cost and complexity of the RF system will be much decreased, and the behaviors of the beam dynamics are also improved significantly because of the low charge density and larger longitudinal acceptance. Furthermore, because of the relatively longer interactive length between the charged particle and the electromagnetic field per cell, it needs relatively less cell numbers and it has larger velocity acceptance compared with the double frequency TH structures. The superconducting section consists of 14 periods, each of which includes 3 superconducting cavities encapsulated in one cryomodule and a doublet in room temperate. The general considerations on cavity and beam dynamics design are discussed and the main results are presented.

关键词： csns double-spoke cavity high current proton linac dynamic stability

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