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Study on the Electron Transmission Efficiency of Gating-GEM Foil in TPC

Author: LiZuo
Tutor: LiYuLan
School: Tsinghua University
Course: Nuclear Science and Technology
Keywords: GEM TPC Soon transmittance Gating
CLC: TL812.3
Type: Master's thesis
Year: 2010
Downloads: 39
Quote: 0
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Abstract


GEM detector is a new type of gas detectors, because of its superior characteristics to be used as track detectors and imaging detector. GEM-based detector readout TPC position resolution, multi-track resolution to meet the measurement accuracy requirements of the ILC experiment is one of the the ILC experimental center track detector choice. GEM detectors have a good positive ion suppression, but still there is a positive ion feedback. Positive ion feedback to the drift region from the GEM detector, caused by the positive ion space charge effect bending affect the drift of electrons in the TPC TPC makes the drift electric field. ILC-TPC GEM enlarged area of ??the end cap detector before setting the layer of gating-GEM film, positive and negative pulse voltage conversion gated closed the Gating-GEM membrane blocking the positive ion feedback back to the drift region. The Gating-GEM film open the door to the primary ionization electrons drift region through the efficiency of the GEM film as a key program of the ILC-TPC experiment gated. How to improve the GEM film electronic transmittance lower voltage difference become the focus of the ILC-TPC gating options. The thesis gives a definition of electronic transmittance from the process of the electron passing hole of the GEM film role in the process will be divided into the collection process and the extracting process, respectively, corresponding to the given collection efficiency and the extraction efficiency is defined. In a theoretical study, from the angle of the flux gives the formula of the collection efficiency and the extraction efficiency. In the simulation study on the Gating-GEM film transmittance for electrons use Maxwell, Garfield, two software. Maxwell used to calculate the electrostatic field distribution, Garfield used to calculate the electron gas properties and electronic transport processes in the gas. The bore hole near the joint use of the two kinds of software can be obtained GEM film delicate electric field structure and the electron hole in the GEM film transfer process. Experimental validation of current measurement methods and spectroscopy methods. In this thesis, the analog electronic transmittance of the GEM film. Analysis of the mixed gas component, the GEM film geometry, the drift electric field, and the transmission electric field three factors, the impact on the the GEM film electronic low voltage differential transmittance improve its operating parameters of the program to optimize the design of gating-GEM film electronic transmittance. The simulation proved the best of circumstances GEM membrane Electronics transmittance of 80% can be achieved.

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CLC: > Industrial Technology > Nuclear technology > Particle detection,radiation detection and nuclear instrumentation > Radiation detection technology and instrumentation > Flicker detection technology and equipment > Gas scintillator
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