Performance of Gas Electron Multiplier (GEM) detector

  • Han, S.H. (Korea Atomic Energy Research Institute) ;
  • Moon, B.S. (Korea Atomic Energy Research Institute) ;
  • Kim, Y.K. (Korea Atomic Energy Research Institute) ;
  • Chung, C.E. (Korea Atomic Energy Research Institute) ;
  • Kang, H.D. (Department of Physics, Kyungpook National University) ;
  • Cho, H.S. (Department of Medical Engineering, Research Institute of Biomedical Engineering, Yonsei University)
  • Published : 2003.12.30

Abstract

We have investigated in detail the operating properties of Gas Electron Multiplier (GEM) detectors with a double conical and a cylindrical structure in a wide range of external fields and GEM voltages. With the double conical GEM, the gain gradually increased with time by 10%; whereas this surface charging was eliminated with the cylindrical GEM. Effective gains above 1000 were easily observed over a wide range of collection field strengths in a gas mixture of $Ar/CO_2(70/30)$. The transparency and electron collection efficiency were found to depend on the ratio of external field and the applied GEM voltage; the mutual influence of both drift and collection fields was found to be trivial.

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