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Design of imaging system for CSNS near-target beam diagnostics

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Radiation Detection Technology and Methods 2018年第2期2卷 38-46页

作者： Zhirong Zeng Shanhua Zhang Weilin Cheng Quanzhi Yu Shaohong Wei Bin Zhou Donghui Zhu Quan Ji Aijun Zeng Tianjiao Liang Yuanbo Chen Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Dongguan Neutron Science Center Dongguan 523803China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of ScienceShanghai 201800China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of ScienceBeijing 100190China

Introduction China Spallation Neutron Source(CSNS)is an accelerator-based pulsed neutron source which produces neutron with spallation reaction induced by proton bombarding tungsten *** increasing beam powers and influences on target,near-target monitoring becomes extreme *** this situation,an optical imaging system for proton beam diagnostics and monitoring near the target is being developed at CSNS,which can provide real-time images of the beam on target and beam distribution *** imaging system design and development In the design of CSNS target imaging system,coating of Cr^(3+):Al_(2)O_(3) is used to convert particle radiation into emission *** to the geometry limits of CSNS target station,a special optical system was designed and fabricated to collect the emission *** the proton beams strike on the target,the coating on the target will be excited,emitting luminescence at the same *** mirrors and lenses of the optical system image the distribution of emission light into a radiation-hard imaging fiber,which transmits the images to the GigE camera located at low-dose area outside of the target *** was written on the LabView platform to control the camera and analyze the images on ***-up of the imaging system was manufactured to test and evaluate the performances of the *** important characteristics of the system were obtained and *** Tests on the mock-up of the system present reliably expectation for beam *** imaging system has been installed at CSNS *** work will be continued to improve the properties of the system.

关键词： beam diagnostics beam profile Imaging system Luminescent coating

Electron beam Spectrum diagnostics with Optical Transition Radiation on the Beijing Free-Electron Laser

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Tsinghua Science and Technology 2004年第2期9卷 246-248页

作者：李泉凤吴频高建江吴刚 Department of Engineering Physics Tsinghua University Beijing 100084 China Beijing Free-Electron Laser Laboratory Institute of High Energy Physics Beijing 100084 China

A measurement system was developed to measure the electron beam spectrum of the Beijing free-electron laser based on the optical transition radiation (OTR). This paper describes the system, which consists of a 32-channel high resolution of 0.02% OTR detector, especially the spectrometer. The OTR an-gular-distribution pattern at the focal plane has two apexes, but the two apexes are smoothed out due to the electron beam energy distribution. The energy spectrum can be measured if the magnet energy resolution is higher than 0.7% to distinguish the electron beam energy distribution.

关键词： optical transition radiation beam diagnostics energy spectrum

Detector development at the Back-n white neutron source

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辐射探测技术与方法(英文) 2023年第2期7卷 171-191页

作者： Fan Ruirui Li Qiang Bao Jie Li Yang Liu Rong Jiang Wei Ren Jie Zhang Qiwei Cao Ping Gu Minhao Ren Zhizhou Yi Han Tang Jingyu An Qi Bai Haofan Bai Jiangbo Chen Qiping Chen Yonghao Chen Zhen Cui Zengqi Fan Anchuan Feng Changqing Feng Fanzhen Gao Keqing Han Changcai Han Zijie He Guozhu He Yongcheng Hong Yang Hu Yiwei Huang Hanxiong Jia Weihua Jiang Haoyu Jiang Zhijie Jin Zhengyao Kang Ling Li Bo Li Chao Li Gong Li Jiawen Li Xiao Liu Jie Liu Shubin Luan Guangyuan Ning Changjun Qi Binbin Ruan Xichao Song Zhaohui Sun Kang Tan Zhixin Tang Shengda Wang Pengcheng Wang Zhaohui Wen Zhongwei Wu Xiaoguang Wu Xuan Xie Likun Yang Yiwei Yu Yongji Zhang Guohui Zhang Linhao Zhang Mohan Zhang Xianpeng Zhang Yuliang Zhang Yue Zhang Zhiyong Zhao Maoyuan Zhou Luping Zhou Zhihao Zhu Kejun The CSNS Back-n Collaboration Institute of High Energy Physics CASBeijing 100049People’s Republic of China Spallation Neutron Source Science Center Dongguan 523803People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049People’s Republic of China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413People’s Republic of China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900People’s Republic of China Department of Modern Physics University of Science and Technology of ChinaHefei 230026People’s Republic of China State Key Laboratory of Particle Detection and Electronics Hefei 230026People’s Republic of China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People’s Republic of China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026People’s Republic of China Northwest Institute of Nuclear Technology Xi’an 710024People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China 不详

Purpose Back-n is a white neutron beamline at China spallation neutron source,which was established in the year of *** is a powerful facility for nuclear data measurement,neutron detector calibration,and radiation effect *** A series of detectors were built for different experiments,including beam monitoring,beam profile measurement,neutron induced secondaries(fission fragments,light charged particles and gamma)cross section measurement,and neutron resonance radiography,etc.A common digitization electronics and a cluster-based DAQ were developed for these detector *** detectors have been employed at Back-n and serviced for experiments from the beginning of the beamline *** and conclusion As an overview of detectors of Back-n,the details of the detector design and the experiment performing are described in this *** developing systems,e.g.,MTPC and B-MCP,are also included.

关键词： White neutron source beam diagnostics Fission fragment Charged particle Gamma Neutron resonance radiography

Electron bunch train excited higher-order modes in a superconducting RF cavity

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Chinese Physics C 2017年第4期41卷 164-168页

作者：高永凤黄森林王芳冯立文庄德浩林林朱凤郝建奎全胜文刘克新 Institute of Heavy Ion Physics and State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

Higher-order mode（HOM） based intra-cavity beam diagnostics has been proved effective and convenient in superconducting radio-frequency（SRF） *** recent research shows that the beam harmonics in the bunch train excited HOM spectrum,which have much higher signal-to-noise ratio than the intrinsic HOM peaks,may also be useful for beam *** this paper,we will present our study on bunch train excited HOMs,including a theoretical model and recent experiments carried out based on the DC-SRF photoinjector and SRF linac at Peking University.

关键词： HOMs bunch train SRF cavity beam diagnostics

The beam-based calibration of an X-ray pinhole camera at SSRF

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Chinese Physics C 2012年第1期36卷 80-83页

作者：冷用斌黄国庆张满洲陈之初陈杰叶恺容 Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics

A pinhole camera for imaging X-ray synchrotron radiation from a dipole magnet is now in operation at the Shanghai Synchrotron Radiation Facility （SSRF） storage *** electron beam size is derived by unfolding the radiation image and the point spread function （PSF） with deconvolution *** performance of the pinhole is determined by the accuracy of the PSF *** article will focus on a beam-based calibration scheme to measure the PSF system by varying the beam images with different quadrupole settings and fitting them with the corresponding theoretical beam *** this method at SSRF,the PSF value of the pinhole is revised from 37 to 44μ*** deviation in beam size between the theoretical value and the measured value isminimized to 4% after *** optimization allows us to observe the horizontal disturbance due to injection down to as small as 0.5μm.

关键词： beam diagnostics X-ray pinhole camera point spread function beam size measurement

Measurements and characteristics of Al_(2)O_(3):Cr^(3+) coating for the proton beam imaging system

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Radiation Detection Technology and Methods 2017年第1期1卷 54-60页

作者： Zhirong Zeng Quanzhi Yu Shaohong Wei Bin Zhou Quan Ji Tianjiao Liang Yuanbo Chen Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Dongguan Neutron Science Center Dongguan 523803China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of ScienceBeijing 100190China

Introduction To set up an online proton beam diagnostic system near the neutron production target of China Spallation Neutron Source(CSNS),a luminescence coating sprayed on the target windowand a corresponding optic system were *** the work,the fabrication of Al_(2)O_(3):Cr^(3+) coating was *** on the sprayed samples were performed to analyze the characteristics of the Al_(2)O_(3):Cr^(3+) *** and tests of coating samples Three kinds of powders with different Cr concentrations were used to fabricate the luminescence coating *** flame spraying,plasma spraying and D-gun spraying processes were ***(PL),X-ray diffraction(XRD),scanned electron mirror(SEM)and radioluminescence experiment by 300 MeV deuterium beam were carried out to analyze and characterize the *** The emission spectrum excited by 532-nm laser has two obvious peaks at 692.9 nm and 694.3 *** samples by flame spraying process with the powders obtained from melting method show higher luminescence intensity than the samples by plasma spraying *** is observed that the luminescence intensity has some relationships with the alpha phase in the samples,which is deduced from the XRD and photoluminescence tests results.A lower temperature during the flame spraying process will help to keep more alpha phase in the *** selected four samples show successful fluoresced results in the radioluminescence *** The luminescence intensity of the coating is improved greatly by the studies on the fabrication process and the characteristics of the *** luminescence coating used in beam diagnostics will be fabricated by the confirmed technical *** works will be continued to improve the characteristics of the luminescence light by controlling Cr concentration and annealing in 1200∼2000℃ environment in the future.

关键词： Al_(2)O_(3):Cr^(3+)luminescence coating beam diagnostics Spallation target

beam CHARACTERIZATIONS OF THE MINI-LIA

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BEAM CHARACTERIZATIONS OF THE MINI-LIA