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国家自然科学基金(10975090)

作品数:3 被引量:2H指数:1
相关作者:李玉兰郑保军邓志勇更多>>
相关机构:清华大学兰州大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:理学更多>>

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TPC探测器内空间电荷电场被引量:2
2012年
为了评估时间投影室探测器内空间电荷对漂移电场的影响,根据Green函数法求解Poisson方程,推导和借鉴了数种适用于TPC的Green函数;给出了计算空间电荷电场的解析形式;计算了单元区域内电荷均匀分布的电势和电场强度;展示了求解TPC空间电场的具体步骤。同时,利用Maxwell软件对单元区域内电荷均匀分布的电场进行了仿真,与Green函数法计算的结果基本一致。结果表明:该文给出的Green函数法适合求解TPC内的空间电场,可以获取正确结果,更加简便和实用。
李玉兰郑保军邓志勇
关键词:空间电荷POISSON方程GREEN函数
Electron transmission ef f iciency of gating-GEM foil for TPC
2012年
In a TPC, ion feedback from the readout detector can cause a space-charge effect and distort the electrical field in the drift region. Gating is one of the effective methods to solve this problem, which can block ions at the expense of losing a certain amount of primary electrons. Compared with the traditional design with a wire structure, gating based on GEM foil is more attractive because of its simplicity. In this paper, the factors influencing the electron transmission efficiency are studied with simulations and experiments. After optimizing all these parameters, an electron transmission efficiency over 80% is obtained.
谢文庆黄孟李婷田阳李玉兰李元景
关键词:GEMGATINGTPC
Drift field improvement and test in a GEM-TPC prototype
2011年
With the help of Maxwell, Ansys and Garfield, a simulation of the electric field and the deviation of electron drift in the drift volume of a GEM-TPC prototype has been accomplished under the following conditions: Field Cages with one-side and double-side strips, with and without a guard ring. The advantage and necessity of a Field Cage with mirror strips and a guard ring were foreseen. According to the simulation results, TU-TPC was modified and tested; a larger effective area and better resolution were achieved.
郑保军李玉兰邓志勇李波
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