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Measurement of avalanche size and position resolution of RPCs with different surface resistivities of the high voltage provider

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Chinese Physics C 2010年第5期34卷 565-570页

作者：岳骞李元景叶瑾程建平王义李金吴昱城 Department of Engineering Physics Tsinghua University Key Laboratory of Particle & Radiation Imaging Tsinghua University

The effects of surface resistivity of the high voltage provider on the space dispersion of the induced charge of a prototype Resistive Plate Chamber （RPC） have been studied experimentally and theoretically. The results of both experiment and theory agree and confirm that a two-Gaussian function can be used to fit the dispersion of the induced charge of the RPC. It is shown that the Gaussian function with the narrower width is mainly due to the expansion of the avalanche charge in the gas gap of the RPC, and the Gaussian function with the larger width is due to the charge dispersion when it passes through the resistive carbon film. This will be useful in the RPC design when one wants to make an RPC with high position resolution.

关键词： RPC surface resistivity avalanche size position resolution

Effect of the integrated time of the induced current signal on the position resolution of the RPC detector

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Chinese Physics C 2009年第8期33卷 673-676页

作者：叶瑾岳骞李元景程建平李金王义 Department of Engineering Physics Tsinghua University Key Laboratory of Particle & Radiation Imaging (Tsinghua University) Ministry of Education

A prototype RPC with position resolution less than 1 mm has been produced and studied. Based on this RPC detector, the effect of the width of the integrated FADC time window on the position resolution of a RPC has been studied experimentally and theoretically. The results of theoretical calculation and experimental measurement have shown good agreement.

关键词： RPC FADC Gaussian function position resolution charge distribution

Development and study of an imaging detector based on high-position resolution THGEM

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Radiation Detection Technology and Methods 2017年第1期1卷 40-47页

作者： Hang Zhao Yu-Guang Xie Wen-Qi Yan Tao Hu Jun-Guang Lv Li Zhou Xiao-Shan Jiang Zhe Ning Fei Li Si Ma Feng Shi Zhi-Gang Wang Yu-Lan Li Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China University of Chinese Academy of Sciences Beijing 100049China Guangxi University NanningGuangxi 530004China

Introduction THickGaseous Electron Multiplier(THGEM)has many advantages while the moderate position resolution is regarded as the main inferiority comparing with the traditional GEM,so this limits the applications of THGEM,such as X-ray imaging and charge particle *** and methods By improving the production techniques,THGEMs with smaller pitch and hole diameter can be made,i.e.,0.4 and 0.15 mm by mechanical drilling,and 0.3 and 0.1 mm by laser etching,*** on the new THGEMs,a two-dimensional imaging detector with 50×50mm sensitive area was developed for 0.1∼50 MeVlow-energy electrons detection and reaching better than 100μm position resolution(sigma).At the same time,a set of front-end electronics was developed based on homemade ASIC chips,i.e.,Charge Amplifier and Shaping Amplifier for GEM(CASAGEM),and applied successfully to the *** The X-ray and beam tests results indicate that both detector and Front End Electronics(FEE)worked well,and the position resolution achieved 74.9μm by using the charge center-of-gravity *** indicates that the high-position resolution THGEM is promising for imaging and tracking application.

关键词： THGEM Imaging detector position resolution ASIC Low energy electron

A high-position-resolution trajectory detector system for cosmic ray muon tomography:Monte Carlo simulation

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Radiation Detection Technology and Methods 2022年第2期6卷 244-253页

作者： Jiajia Zhai Haohui Tang Xianchao Huang Shuangquan Liu Yingjie Wang Chong Li Xiuzuo Liang Yi Zhang Meichan Feng Zhiming Zhang Long Wei Beijing Engineering Research Center of Radiographic Techniques and Equipment Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

Purpose The research focuses on the related designing and simulating the high-position-resolution trajectory detector system based on cosmic ray muon *** The energy deposition of muon in the detector varies with the length of the ionization *** The simulation of the submillimeter detector system was designed for muon *** optimal position resolution of the detector reached 0.6 *** The entire research process includes the selection of analysis of parameters affecting system design,designing of two high-position-resolution detectors based on plastic scintillators,implementation of different imaging algorithms and image quality assessment based on different imaging *** provides a solution based on high positional resolution plastic scintillator detectors for cosmic ray muon scattering imaging.

关键词： Cosmic ray Muon tomography Plastic scintillator position resolution PoCA MLSD-EM

Optimization of the cavity beam-position monitor system for the Shanghai soft X-ray free-electron laser user facility

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Nuclear Science and Techniques 2022年第10期33卷 22-32页

作者： Jian Chen Yong-Bin Leng Lu-Yang Yu Long-Wei Lai Ren-Xian Yuan Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

To achieve high-efficiency operation of the highgain free-electron laser(FEL),the electron beams and radiated photon beams need to be overlapped precisely and pass through the entire undulator ***,a high-resolution beam-position monitor(BPM)is required.A cavity BPM(CBPM)with a resonant cavity structure was developed and used in the Shanghai Soft X-ray FEL(SXFEL)test facility and can achieve a position resolution ofposition *** this case,the factors that affect the performance of the CBPM system were further *** included the amplitude and phase stability of the local oscillator,stability of the trigger signal,performance of the radio frequency front-end,signal processing electronics,and signal processing *** on the upgrade and optimization of the system,a beam test platform was built at the end of the linear acceleration section of the SXFEL,and the experimental results show that the position resolution of the system can reach 177 nm at a bunch charge of 500 pC,and the dynamic range is controlled within±300μm,and the relative measurement uncertainty of the bunch charge can reach 0.021%,which are significant improvements compared to the attributes of the previous system.

关键词： Cavity BPM SXFEL System optimization position resolution Measurement uncertainty Algorithm

Large area^(3)He tube array detector with modular design for multi‑physics instrument at CSNS

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Nuclear Science and Techniques 2023年第1期34卷 1-12页

作者： Lin Zhu Jian‑Rong Zhou Yuan‑Guang Xia Liang Xiao Hong Luo Xiao‑Juan Zhou Wen‑Qin Yang Bei‑Ju Guan Xing‑Fen Jiang Yan‑Feng Wang Hong Xu Hai‑Yun Teng Li‑Xin Zeng Jia‑Jie Li Lei Hu Ke Zhou Yong‑Xiang Qiu Pei‑Xun Shen Jun Xu Li‑Jiang Liao Xiao‑Zhuang Wang Gui‑An Yang Huai‑Chan Chen Ju‑Ping Xu Zhi‑Duo Li Song‑Lin Wang Jian Zhuang Yu‑Bin Zhao Jun‑Rong Zhang Wen Yin Zhi‑Jia Sun Yuan‑Bo Chen Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China University of Chinese Academy of Sciences Beijing 100049China

The multi-physics instrument(MPI)is the first user cooperative instrument at the China Spallation Neutron Source(CSNS).It was designed to explore the structures of complex materials at multiple scales based on the neutron total scattering *** imposes the requirements for the detector,including a high detection efficiency to reduce the measurement time and a large solid angle coverage to cover a wide range of momentum *** satisfy these demands,a large-area array of 3He-filled linear position-sensitive detectors(LPSDs)was constructed,each with a diameter of 1 inch and pressure of 20 *** uses an orbicular layout of the detector and an eight-pack module design for the arrangement of 3He LPSDs,covering a range of scattering angles from 3°to 170°with a total detector area of approximately 7 *** detector works in air,which is separated from the vacuum environment to facilitate installation and *** characteristics of the MPI detector were investigated through Monte Carlo(MC)simulations using Geant4 and experimental *** results suggest that the detectors are highly efficient in the wavelength range of the MPI,and an efficiency over 25%is achievable for above 0.1 A neutrons.A minimal position resolution of 6.4 mm full width at half maximum(FWHM)along the tube length was achieved at a working voltage of 2200 V,and a deviation below 2 mm between the real and measured positions was attained in the beam *** detector module exhibited good consistency and an excellent counting rate capacity of up to 80 kHz,which satisfied the requirements of experiments with a high event *** of its operation over the past year have shown that the detector works steadily in sample experiments,which allows the MPI to serve the user program successfully.

关键词： Neutron detector LPSD position resolution Counting rate capacity

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 *** than 65%of neutron instruments at the China Spallation Neutron Source(CSNS)require ^(3)He LPSDs for the building of the detector *** detector of a neutron scattering instrument is normally an array detector composed of a large number of ^(3)He ***,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 *** necessitates the development of ^(3)He LPSDs with different specifications for building and upgrading the detectors of neutron scattering instruments at *** 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 *** 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 *** 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 *** 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 *** 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 *** addition,this ^(3)He

关键词： Counting rate CSNS LPSD Plateau curve position resolution

Delay line readout of a large dimension multi-wire proportional chamber

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Chinese Physics C 2012年第6期36卷 519-524页

作者：黎先利张云龙钱浩许咨宗汪晓莲 University of Science and Technology of China Northwest Institute of Nuclear Technology

A two dimensional multi-wire proportional chamber with delay line readout was developed, which has a large sensitive area of 30 cmx30 cm. Two cathode planes using printed circuit boards are orthogonally placed to give two coordinates of the impact point of the particle. Signals collected from the cathode strips are amplified and discriminated from two ends of the delay line at each cathode board. By recording the time difference between the two discrimination pulses and the common gate pulse from anode wires, a coordinate position was reconstructed, and a position resolution of better than 1 mm could be obtained in the whole sensitive area along the anode wires.

关键词： MWPC delay line position resolution

Test and simulation of a MICROMEGAS detector

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Chinese Physics C 2011年第11期35卷 1033-1036页

作者：鲁辰桂段利敏徐瑚珊杨贺润胡荣江张金霞李祖玉 Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

We report on the recent test results of a MICROMEGAS detector in terms of position resolution, time resolution and efficiency. With a Ar＋CO2 （10%） gas mixture and a strip pitch of 200 μm an accuracy of 80 μm in sigma on the position has been measured. The time resolution is better than 20 ns and a cosmic ray detection efficiency of 94% was obtained. A Monte Carlo simulation indicates that transverse diffusion, gain fluctuation and electronic noise limit the position resolution.

关键词： position resolution time resolution detection efficiency Monte Carlo simulation