Browse > Article

Calculation of Primary Electron Collection Efficiency in Gas Electron Multipliers Based on 3D Finite Element Analysis  

Kim, Ho-Kyung (School of Mechanical Engineering, Pusan National University)
Cho, Min-Kook (School of Mechanical Engineering, Pusan National University)
Cheong, Min-Ho (School of Mechanical Engineering, Pusan National University)
Shon, Cheol-Soon (School of Mechanical Engineering, Pusan National University)
Hwang, Sung-Jin (School of Mechanical Engineering, Pusan National University)
Ko, Jong-Soo (School of Mechanical Engineering, Pusan National University)
Cho, Hyo-Sung (Department of Radiological Science, BAERI, Yonsei University)
Publication Information
Journal of Radiation Protection and Research / v.30, no.2, 2005 , pp. 69-75 More about this Journal
Abstract
Gas avalanche microdetectors, such as micro-strip gas chamber (MSGC), micro-gap chamber (MGC), micro-dot chamber (MDOT), etc., are operated under high voltage to induce large electron avalanche signal around micro-size anodes. Therefore, the anodes are highly exposed to electrical damage, for example, sparking because of the interaction between high electric field strength and charge multiplication around the anodes. Gas electron multiplier (GEM) is a charge preamplifying device in which charge multiplication can be confined, so that it makes that the charge multiplication region can be separate from the readout micro-anodes in 9as avalanche microdetectors possible. Primary electron collection efficiency is an important measure for the GEM performance. We have defined that the primary electron collection efficiency is the fractional number of electron trajectories reaching to the collection plane from the drift plane through the GEM holes. The electron trajectories were estimated based on 3-dimensional (3D) finite element method (FEM). In this paper, we present the primary electron collection efficiency with respect to various GEM operation parameters. This simulation work will be very useful for the better design of the GEM.
Keywords
Gas electron multiplier; Radiation detector; Electric field; Finite element method;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 M.K. Cho, M.H. Cheong, H.K. Kim, S.J. Hwang, J.S. Ko and H. Cho, 'Electric field simulation of gas electron multipliers with various geometries,' Bulletin of the Korea Physical Society, 22(2), 373(2004)
2 M.K. Cho, H.K. Kim, M.H. Cheong, S.J. Hwang, J.S. Ko and H. Cho, 'Finite element analysis of electric field properties in gas electron multipliers,' Proc. of the Korean Nuclear Society Autumn Meeting, 1143-1144 (2004)
3 R. Bellazzini, A. Brez, G. Gariano, L. Latronico, N. Lumb, G. Spandre, M.M. Massai, R. Raffo and M.A. Spezziga, 'What is the real gas gain of a standard GEM ?,' Nucl. Instr. Meth A, 419, 429-437(1998)   DOI   ScienceOn
4 H.S. Cho, W.S. Hong, N. Palaio, J. Kadyk, K.B. Luk, V. Perez-Mendez, K.S. Joo and J. Vujic, 'Spark damage studies of microgap gas chambers with various anode strip metals,' IEEE Trans. Nucl. Sci, 44(3), 635-639(1997)   DOI   ScienceOn
5 F. Sauli, 'GEM: A new concept for electron amplification in gas detectors,' Nucl. Instr. Meth A, 386, 531-534(1997)   DOI   ScienceOn
6 H.K. Kim, G. Cho, D.K. Kim and H. Cho, 'Gas electron multiplier made by deep-etch X-ray lithography,' J. Kor. Phys. Soc., 40(5), 812-819(2002)
7 G.F. Knoll, Radiation Detection and Measurement, John Wiley & Sons(2000)