共查询到20条相似文献,搜索用时 31 毫秒
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Siwon Jang Sang Gon Lee Chang Hwy Lim Hyun Ok Kim Sang Yeol Kim Seung Hun Lee Joohwan Hong Juhyeok Jang Taemin Jeon Myung Kook Moon Wonho Choe 《Current Applied Physics》2013,13(5):819-825
An advanced tangential X-ray pinhole camera (TXPC) has been developed for KSTAR by utilizing a 2-D duplex multi-wire proportional counter (MWPC) detector. The KSTAR MWPC employs a 2-D parallel type readout system for high temporal resolution and adopts a duplex type for the capability of electron temperature measurement via the multi-color method. This paper presents the performance test result of the developed MWPC system utilizing a Fe-55 X-ray source. As a preliminary experimental result from the 2012 KSTAR campaign, the clear presentation of sawtooth activities and its frequency change, and 2-D plasma images during the vertical disruption event are given. 相似文献
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介绍了北京正负电子对撞机直线加速器附设e,p试验束多丝室的结构及工作机理。该室间隙6 mm,窗口面积80 mm×80 mm,位置灵敏面积50 mm×50 mm;阳极丝和阴极丝分别采用直径为20 mm和50 mm镀金钨丝,阳极丝距2 mm,阴极丝距0.7 mm,每6根阴极丝并联构成阴极条,阴极条间距4.2 mm。采用阴极条感应重心读出分辨位置,对5.9 keV的γ光子,获得优于0.3 mm (FWHM)的位置分辨;对1.1 GeV电子束流,获得0.224 mm (FWHM)的位置分辨。 相似文献
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Jing-Hui Pan Chang-Li Ma Xue-Yu Gong Zhi-Jia Sun Yan-Feng Wang Chen-Yan Yin Lei Gong 《中国物理C(英文版)》2016,40(9):096201-096201
In a multi-wire proportional chamber detector(MWPC), the anode and signal wires must maintain suitable tension, which is very important for the detector's stable and accurate performance. As a result, wire tension control and measurement is essential in MWPC construction. A high pressure3 He MWPC detector is to be used as the thermal neutron detector of the multi-functional reflectometer at China Spallation Neutron Source, and in the construction of the detector, we have developed a wire tension measurement system. This system is accurate,portable and time-saving. With it, the wire tension on an anode wire plane has been tested. The measurement results show that the wire tension control techniques used in detector manufacture are reliable. 相似文献
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In this report,the stable corona discharge region of multi-wire proportional cham-ber(MWPC)has been measured.In this region we observed double peak pheno- menon in Fe55 pulse amplitude distribution,and establish the fact that,once cornadischarge region is present in MWPC,the spatial resolution power for light partic-les will be lost. 相似文献
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介绍了北京正负电子对撞机直线加速器附设e,p试验束多丝室的结构及工作机理。该室间隙6 mm,窗口面积80 mm×80 mm,位置灵敏面积50 mm×50 mm;阳极丝和阴极丝分别采用直径为20 mm和50 mm镀金钨丝,阳极丝距2 mm,阴极丝距0.7 mm,每6根阴极丝并联构成阴极条,阴极条间距4.2 mm。采用阴极条感应重心读出分辨位置,对5.9 keV的γ光子,获得优于0.3 mm (FWHM)的位置分辨;对1.1 GeV电子束流,获得0.224 mm (FWHM)的位置分辨。 相似文献
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YU CHEN LUO KAI-YUAN PENG HUA-SHOU LI ZHONG-ZHEN TIAN DE-YUAN HU JIA-WEI 《中国物理C(英文版)》1979,3(5):604-609
Delay time distribution of MWPC has been measured systematically,and experi-mental results have roughly analyzed. 相似文献
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WANG De-Wu SHEN Gui-Lin NA Shu-Zhen LI Yun-Shan LI Cheng-Ze LI Zhi-Gang CHEN Kun CHEN Yuan-Bo CHEN Zhi-Ping MA Mei SHEN Miao-He ZHAO Mei LOU Jia-Shu XU Rong-Fen 《中国物理C(英文版)》1988,12(3):289-297
A positron CT camera system using multiwire proportional chambers as detectors is reported.This system is composed of two high density MWPC γ-ray detectors,an electronic readout system and a computer for data processing.The tomography of three dimensions is obtained.The imaging matrix 64×64×16. 相似文献
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描述了为兰州放射性粒子束流线(RIBLL Ⅱ)上测量束流径迹而研制的一种基于LC延迟电路的双层多丝正比室(MWPC)。该探测器的探测灵敏面积为100 mm×80 mm,位置信号由阴极丝引出并通过LC延迟电路读出。探测器由两套完整的多丝正比室组成,每套的阳极丝夹在两层平行的阴极丝之间,阳极丝和阴极丝相互垂直。两套阴极丝相互垂直给出入射粒子的二维位置信息。为了增大感应信号以提高探测效率,将每套位置对应的阴极丝合并成一路接入LC延迟电路。用55Fe-5.9 keV X射线源均匀照射探测器的灵敏区域,测试表明其具有良好的位置灵敏一致性。用X射线源通过准直狭缝扫描整个探测器的灵敏区域,得到X,Y层的位置线性度均好于0.999;其位置分辨(σ)分别为199.9 μm和154.0 μm,目前,该探测器已成功用于RIBLL Ⅱ的实验中。A double-layer Multi-Wire Proportional Chamber (MWPC) with 100 mm×80 mm active area has been developed for Radioactive Ion Beam Line in Lanzhou(RIBLL Ⅱ). The position information has been obtained by a LC delay circuit readout method. Being called of double-layer MWPC, it is composed of two full MWPCs, each consists of an anode plane sandwiched between two parallel cathode planes, anode wires and cathode wires are perpendicular to each other. In order to improve the detection efficiency, the cathode wires of corresponding position are combined to enhance inductive signal. The cathode wires of two full MWPCs are orthogonally placed to give two coordinates of the incident particles. The sensitivity uniformity is also found to be relatively good and the position resolution of X, Y direction are measured to be 199.9 and 154.0 μm using a 55Fe-5.9 keV X ray, respectively. The position linearity of X, Y direction are as good as 0.999 for whole sensitive area of the detector. The detector has been used successfully on the experiment at RIBLL Ⅱ. 相似文献
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为满足中国散裂中子源(CSNS)多功能反射谱仪(MR)主探测器高气压3He多丝正比室探测器(MWPC)的需求,研制了专用的读出电子学系统。该系统主要由核心前放板和触发扇出板构成,其中以前放板为核心,采用了6块前放板实现探测器142路模拟信号的数字化,并通过判选机制甄别中子信息,将有效中子事例打包发送给后端,触发扇出板提供同一时刻到达的T0信号和触发信号,以确保数据的对齐。读出电子学系统分别在实验室和束流条件下,进行了相关指标测试,测试结果表明性能优于设计要求。目前MWPC探测器已经成功安装到MR谱仪现场,并且已经开始稳定运行。 相似文献
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WANG Xiao-Hu ZHU Qi-Ming CHEN Yuan-Bo CHEN Chang LIU Rong-Guang WANG Lan JIN Yan MA Xiao-Yan JIANG Shan 《中国物理C(英文版)》2008,32(11):903-907
A prototype of a two-dimensional position sensitive X-ray detector was designed and constructed for small angle X-ray scattering experiments at BSFR (Beijing Synchrotron Radiation Facility). The detector is based on MWPC with cathode strip readout, and has a sensitive area of 200 mmx200 mm. The spatial resolution (FWHM) of about 210 μm along the anode wire direction was obtained from the 55Fe X-ray test of the detector. 相似文献
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Two couples of low pressure multi-wire proportional chambers (MWPC) were located in the target chamber to detect fission fragments in a hypernuclei producing experiment at Thomas Jefferson National Laboratory (Jlab). In the experiment, a continuous wave (CW) electron beam was applied to form hypernuclei by electromagnetic interaction. In the target chamber, the high energy (1.853 GeV) and high intensity (500 nA) primary electron beam caused a high particle background, which influenced the detection of the fission fragments. This report described the design of the MWPCs and studied the fission-fragment detecting performance of them under such a high background. The efficiency of the MWPCs was given with the help of a high resolution kaon spectrometer. At the same time, the background particles were discussed with a Monte Carlo code based on GEANT4. 相似文献
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The Monte Carlo method is used to simulate the 12C+12C reaction process. Taking into account the size of the incident 12C beam spot and the thickness of the 12C target, the distributions of scattered 12C on the MWPC and the CsI detectors at a detective distance have been simulated. In order to separate elastic scattering from the inelastic scattering with 4.4 MeV excited energy, we set several variables: the kinetic energy of incident 12C, the thickness of the 12C target, the ratio of the excited state, the wire spacing of the MWPC, the energy resolution of the CsI detector and the time resolution of the plastic scintillator. From the simulation results, the preliminary establishment of the experiment system can be determined to be that the beam size of the incident 12C is φ 5 mm, the incident kinetic energy is 200-400 A MeV, the target thickness is 2 mm, the ratio of the excited state is 20%, the ight distance of scattered 12C is 3 m, the energy resolution of the CsI detectors is 1%, the time resolution of the plastic scintillator is 0.5%, and the size of the CsI detectors is 7 cm×7 cm, and we need at least 16 CsI detectors to cover a 0° to 5° angular distribution. 相似文献
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Y.X. Watanabe A. Yoshida T. Fukuda T. Sekine Y. Watanabe H. Ikezoe Y. Nagame T. Ikuta I. Nishinaka Y. Mizoi J. Nakano M. Hirai H. Sakurai H. Kobinata Y. Pu K. Kimura M. Ishihara 《The European Physical Journal A - Hadrons and Nuclei》2001,10(4):373-379
A systematic study of the sub-barrier fusion reactions with neutron-rich projectiles has been carried out for three isotopes
27,29,31Al bombarding a 197Au target. A target chamber equipped with a target stack and sets of MWPC was employed in order to enhance the efficiency
of the radioactive beam experiment. Coupled-channel calculations including the quadrupole excitations do not well fit the
measured fusion excitation functions, whereas flat barrier distributions to represent the coupling to the neutron transfer
largely account for the observed enhancement of the sub-barrier fusion cross-sections.
Received: 13 March 2001 / Accepted: 27 April 2001 相似文献
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Makoto Kobayashi 《Pramana》2007,69(6):981-987
We conducted a series of beam tests of prototype TPCs for the international linear collider (ILC) experiment, equipped with
an MWPC, a MicroMEGAS, or GEMs as a readout device. The prototype operated successfully in a test beam at KEK under an axial
magnetic field of up to 1 T. The analysis of data is now in progress and some of the preliminary results obtained with GEMs
and MicroMEGAS are presented along with our interpretation. Also given is the extrapolation of the obtained spatial resolution
to that of a large TPC expected as the central tracker of the ILC experiment.
on behalf of part of the ILC-TPC Collaboration 相似文献
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TIAN LiChao CHEN YuanBo TANG Bin ZHOU JianRong QI HuiRong LIU RongGuang ZHANG Jian YANG GuiAn XU Hong CHEN DongFeng SUN ZhiJia 《中国科学:物理学 力学 天文学(英文版)》2013,56(10):1882-1886
A 2D neutron detector based on 3 He convertor and MWPC with an active area of 200 mm×200 mm has been successfully designed and fabricated.The detector has been tested with Am/Be neutron source and with collimated neutron beam with the wavelength of =1.37.The best spatial resolution of 1.18 mm(FWHM) and good linearity were obtained.This is in good agreement with theoretical calculations. 相似文献
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《中国物理C(英文版)》2015,(10)
For MWPCs used for X-ray position detection, simulation studies of the anode wire modulation effect of the detector were carried out using the Garfield program. Different gas mixtures were used as the working gas in the simulation, so as to obtain the influence of the X-ray cross section and electron diffusion coefficient of the working gases on the anode wire modulation effect of an MWPC with anode wire spacing of 2 mm. Results show that, though a working gas with higher X-ray cross section implies a larger average drift distance for the ionized electrons, such gas mixtures are of little use in improving the anode wire modulation effect of MWPCs. It is found that the transverse electron diffusion coefficient is the determining factor for the extent of the anode wire modulation effect in the detector. 相似文献
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G. Fidecaro M. Fidecaro L. Lanceri S. Nurushev L. Piemontese Ch. Poyer V. Solovianov A. Vascotto F. Gasparini A. Meneguzzo M. Posocco C. Voci R. Birsa F. Bradamante M. Giorgi A. Penzo P. Schiavon A. Villari H. Stradner 《Nuclear Physics B》1980,173(3):513-545
The polarization parameter in pp elastic scattering at 150 GeV/c, and in the momentum transfer interval 0.4 ? ?t ? 3.0 GeV2, has been measured in an MWPC and scintillation counter experiment at the CERN SPS using a polarized proton target. The polarization is decreasing steadily from zero to ≈ ? 10% in the range 0.4 < ?t < 1.3 GeV2; for higher |t| the data suggests a change of sign. Results are also given for the differential cross section, which exhibits a small dip at ?t = (1.46 ± 0.01) GeV. 相似文献