Electron transmission efficiency of gating-GEM foil for TPC

XIE Wen-Qing; HUANG Meng; LI Ting; TIAN Yang; LI Yu-Lan; LI Yuan-Jing

doi:10.1088/1674-1137/36/4/008

Chinese Physics C> 2012, Vol. 36> Issue(4) : 339-343 DOI: 10.1088/1674-1137/36/4/008

Electron transmission efficiency of gating-GEM foil for TPC

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Abstract：
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 in uencing the electron transmission e ciency are studied with simulations and experiments. After optimizing all these parameters, an electron transmission e ciency over 80% is obtained.

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XIE Wen-Qing, HUANG Meng, LI Ting, TIAN Yang, LI Yu-Lan and LI Yuan-Jing. Electron transmission efficiency of gating-GEM foil for TPC[J]. Chinese Physics C, 2012, 36(4): 339-343. doi: 10.1088/1674-1137/36/4/008

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Received: 2011-07-08
Revised: 2011-07-25

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沈阳化工大学材料科学与工程学院沈阳 110142

Electron transmission efficiency of gating-GEM foil for TPC

Corresponding author: LI Yu-Lan,

Received Date: 2011-07-08
Accepted Date: 2011-07-25
Available Online: 2012-04-05

Abstract: 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 in uencing the electron transmission e ciency are studied with simulations and experiments. After optimizing all these parameters, an electron transmission e ciency over 80% is obtained.