Chinese Physics C > 2007, Vol. 31 > Issue(5): 475-480

Study of Gas Properties for GEM-Based TPC

Department of Engineering Physics, Tsinghua University, Beijing 100084, China2 Institute of Chemical Defense, Beijing 102205, China3 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
TPC is widely used as a tracking detector in many colliding beam experiments. A GEM-based TPC is under construction and the working gases are to be considered. The paper summarizes the transport properties of ionization electrons generated in gas mixtures that are suitable to work in TPC with GEM as its endcap detector. The lifetime of electrons, the drift velocity and diffusion are simulated and investigated, with the help of Garfield. With a theoretical analysis, a gas mixture of Argon, CH ₄and CF ₄is proposed. The performance of GEM with the proposed gas is excellent with regard to the gas gain and energy resolution, which makes it a promising candidate for the future GEM-based TPC.

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CAO Liang-Jun, LI Yu-Lan, LAI Yong-Fang, LI Jin and LI Yuan-Jing. Study of Gas Properties for GEM-Based TPC[J]. Chinese Physics C, 2007, 31(5): 475-480.

CAO Liang-Jun, LI Yu-Lan, LAI Yong-Fang, LI Jin and LI Yuan-Jing. Study of Gas Properties for GEM-Based TPC[J]. Chinese Physics C, 2007, 31(5): 475-480. shu

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Received: 2006-07-19
Revised: 2006-08-10

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of Gas Properties for GEM-Based TPC

Corresponding author:CAO Liang-Jun,

Department of Engineering Physics, Tsinghua University, Beijing 100084, China2 Institute of Chemical Defense, Beijing 102205, China3 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Received Date:2006-07-19
Accepted Date:2006-08-10
Available Online:2007-05-05

Abstract:TPC is widely used as a tracking detector in many colliding beam experiments. A GEM-based TPC is under construction and the working gases are to be considered. The paper summarizes the transport properties of ionization electrons generated in gas mixtures that are suitable to work in TPC with GEM as its endcap detector. The lifetime of electrons, the drift velocity and diffusion are simulated and investigated, with the help of Garfield. With a theoretical analysis, a gas mixture of Argon, CH₄and CF₄is proposed. The performance of GEM with the proposed gas is excellent with regard to the gas gain and energy resolution, which makes it a promising candidate for the future GEM-based TPC.