期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Background Simulation of a Fission Fragment Chamber in the Experiment of ^(209)Bi(e,e’K^+)^(209)_ ΛPb
1
作者 宋玉收 刘辉兰 +2 位作者 席印印 颜强 胡碧涛 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第5期415-418,共4页
An experiment for measuring the hyperon-related fission rate was carried out with the reaction 209^Bi(e, e'K^+)209^hPb at the Thomas Jefferson National Laboratory (Jlab). In the experiment, the performance of th... An experiment for measuring the hyperon-related fission rate was carried out with the reaction 209^Bi(e, e'K^+)209^hPb at the Thomas Jefferson National Laboratory (Jlab). In the experiment, the performance of the fission fragment detector (FFD) was dramaticlly crashed by the background particles in comparison with that during the test without beam. The scattering of the high intensity (500 nA) primary electrons was the dominant cause. Using the GEANT4 toolkit, this report simulates the experimental situation of the target chamber in which the FFD was located. The simulation results indicate that the background particles were dominantly (~ electrons, and protons and alpha particles were the important heavy background particles. The performance of the multi-wire proportional chambers (MWPCs) depends not only on the background-particle intensity but also the current density, which was also given by the simulation code. Furthermore, the measures to suppress the background particles were also investigated with the simulation code. 展开更多
关键词 fission fragments HYPERON background particles Monte Carlo simulation
下载PDF
Physics design of collimators to reduce lost particle background at the CEPC 被引量:1
2
作者 岳腾 修青磊 +2 位作者 王毅伟 段哲 秦庆 《Chinese Physics C》 SCIE CAS CSCD 2016年第11期166-173,共8页
At the CEPC (Circular Electron Positron Collider), which is proposed by the Chinese high energy physics community, the dominant background comes from radiative Bhabha scattering and the beamstrahlung effect accordin... At the CEPC (Circular Electron Positron Collider), which is proposed by the Chinese high energy physics community, the dominant background comes from radiative Bhabha scattering and the beamstrahlung effect according to preliminary research. Therefore, it is necessary to incorporate a collimator system to intercept particles that may be lost near the interaction region (IR). In this paper, we introduce some limitations in choosing the position and width of the collimators. A certain parameter range is determined which is confined by the β function and the width of the collimators. A suitable choice of the half width is made by exploring this parameter range. A simulation of the particle loss rate in the IR and the hit density in the vertex detector with and without the collimators shows that the set of parameters of the collimators we designed is appropriate and effective. 展开更多
关键词 CEPC lost particle background COLLIMATOR
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部