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以CMS电磁量能器的钨酸铅晶体阵列排布方式为例 ,研究了电磁型粒子入射位置的在桶部的重建方法 ,提出了带参数的对数重心拟合新方法 ,该方法在形式上直观 ,在操作上简单 ,适用于其它电磁量能器 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 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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介绍了新型探测器多气隙电阻板室(Multi-gap Resistive Plate Chamber,MRPC)在中国十多年的发展.伴随着在相对论重离子对撞机(Relativistic Heavy Ion Collider,RHIC)上STAR实验的成功运行和在带电粒子鉴别方面的突出作用,MRPC技术在高能核与粒子物理领域逐渐得到广泛应用,有力地促进了相关物理课题的研究. 相似文献
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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 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