排序方式: 共有67条查询结果,搜索用时 15 毫秒
61.
中国散裂中子源将建设一台基于~3He气体的二维多丝室,作为多功能反射谱仪束线的中子探测器.基于已有的研究,为优化选择二维多丝室探测器的丝结构,本文研究了三种不同的丝结构,并采用重心读出方法和数字读出方法进行了探测器的性能测量,得到了满足多功能反射谱仪探测器需求的读出方法.实验结果表明:对同种丝结构的二维多丝室探测器,重心读出方法的位置分辨和成像性能都好于数字读出方法;基于重心法读出的多丝室探测器位置分辨率可以达到约160μm,基于数字读出方法的多丝室探测器位置分辨率可以达到约400μm.优化设计的丝结构为:基于重心读出法的阳极丝间距1.5 mm、读出通道间距4 mm,基于数字读出法的阳极丝间距1.5 mm、读出通道间距2 mm.优化设计的丝结构均能满足谱仪的位置分辨要求. 相似文献
62.
Testing of a triple gas electron multiplier (GEM) with pixel-pads is
described. Images by scanning and suspending radioactive sources
were obtained by using 96 channels digital data acquisition (DAQ)
system which was composed of 96 8× 8~mm2 pads and
associated electronics channels. 相似文献
63.
A method to determine precisely three-dimensional wire positions in the BESⅢ drift chamber using physics events is introduced. In part the proposed technique takes advantage of the possibility that the magnetic field can be turned off, thereby providing a huge sample of straight tracks for which effects due to multiple scattering, energy loss and non-uniformity of the magnetic field are minimized during the calibration process. A toy Monte Carlo study is performed to demonstrate the viability of the method. As a result of the calibration process, the rms of the distribution of wire position deviation is reduced from 35μm to 10μm. 相似文献
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To reduce the discharge of the standard bulk Micromegas and GEM detectors, a GEM-Micromegas detector was developed at the Institute of High Energy Physics. Taking into account the advantages of the two detectors, one GEM foil was set as a preamplifier on the mesh of Micromegas in the structure and the CEM pream- plification decreased the working voltage of Micromegas to significantly reduce the effect of the discharge. At the same gain, the spark probability of the GEM-Micromegas detector can be reduced to a factor 0.01 compared to the standard Micromegas detector, and an even higher gain could be obtained. This paper describes the performance of the X-ray beam detector that was studied at 1W2B Laboratory of Beijing Synchrotron Radiation Facility. Finally, the result of the energy resolution under various X-ray energies was given in different working gases. This indicates that the GEM-Micromegas detector has an energy response capability in an energy range from 6 keV to 20 keV and it could work better than the standard bulk-Micromegas. 相似文献
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CHEN Yuan-Bo DONG Xue-Sheng HUANG Yin-Zhi LI Da-Shi LIN Wei LIU Yue-Jun PAN Zhao-Hui WU Wei-Min YANG Chang-You ZHANG Bing-Yun ZHANG Chang-Chun ZHAO Wei-Ren ZHU Guo-Sheng 《中国物理C(英文版)》1989,13(8):680-688
The paper briefly describes the hardware configuration and software components of the BES (Beijing Spectromenter) on-line data acquisition system,and summarizes the development of this system we completed in the recent two years.A successful run of the on-line system has been performed in the BES'S cosmic ray test. 相似文献