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A two dimensional multi-wire proportional chamber with delay line readout was developed, which has a large sensitive area of 30 cm× 30 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. 相似文献
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The structure and working principle of Micromegas (MICRO Mesh Gaseous Structure) is discussed. Some radiation sources of α and X rays are used to test this detector. The optimized electric-field intensity of the conversion gap is obtained. The transmission of electrons and the uniformity of the amplification gap are also presented. The energy resolution of the 5.9 keV peak is better than 27%. 相似文献
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The fast luminosity monitor counting the γ photons above a given energy threshold emitted from radiative Bhabha scattering has been operated in the BEPC Ⅱ to measure the relative luminosity bunch by bunch for the first time and used successfully in beam tuning of BEPC Ⅱ. In the relative mode the monitor is able to deliver the relative luminosities with an accuracy of 0.8 %. By steering the electron beam while observing the counting rate changes of the monitor the horizontal and vertical sizes of the bunch spots can be estimated as: Sxe+ =Sxe =0.356 mm, Sye+ =Sye- =0.011 mm. 相似文献
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Micromegas prototypes with thermo-bond film separators 总被引:1,自引:0,他引:1
In this paper we report the results of Micromegas prototypes constructed by attaching micromesh to an anode using thermo-bond films. The excellent metal attaching ability and good dielectical property of this kind of film make it a promising material to be used as avalanche gap spacers. Several prototypes are successfully made. The electron transmission properties are first studied and then the gas gain is measured in argon-isobutane mixtures. The maximum gain of more than 104 is easily obtained. The energy resolutions for 55Fe 5.9 keV Kα ray can be better than 20% over one magnitude in gain for different operational gas mixtures and the best energy resolution of 13.7% (FWHM) can be achieved with the gas mixture of 94% argon concentration. The preliminary test results of the prototypes with sensitive area of 45 mm×45 mm without internal support show good uniformity across the sensitive area. 相似文献
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用蒙特卡罗模拟的方法,研究了影响闪烁光纤时间分辨的物理因素,包括光子在光纤中的发射,传输,吸收和最后在光电倍增管输出端形成电泳冲等过程,并和实验结果进行了比较。 相似文献
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The particle acceptance instead of the G-factors has been introduced for a particle telescope. The particle acceptance of a telescope module TEST is simulated by using the GEANT4 Monte-Carlo package. The results are presented and explained. 相似文献
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The magnetic characteristics of R5610A-01 photomultiplier tubes are studied in this paper. The experimental data shows that the gain of R5610A-01 loses about 53% when the magnetic field is 3 Gs along its +X axis. A cylinder of one-layer permalloy strip is able to reduce the effect of a 3 Gs magnetic field on the PMT gain to less than 1%. 相似文献
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由于低能带电粒子核反应截面直接测量遇到的库仑位垒和电子屏蔽势的困难,基于准自由反应机制的特洛伊木马方法得到特别关注。利用Geant4模拟的结果,与在中国原子能研究院串列加速器上通过三体反应9Be+2H→8Be+2H+n对两体反应9Be+1H→8Be+2H的反应截面做的间接测量实验数据进行了比较,这是Geant4模拟在特洛伊木马方法中的首次应用。通过对模拟数据研究,提高了对实验数据的理解,也检验了模拟系统的可靠性,对今后的实验设计和改进提供了有益的意见。 相似文献