THGEM for Multi-Proposal 2-D Image Detection

Abstract

A GEM (Gas Electron Multiplier) based detector, which consists of the drift area, the electron multiplication area, and the induction area, was proposed by Fabio Sauli in 1977 [1]. A GEM is made of a thin polymer film that is perforated with a periodic array and is coated with a thin metallic film on both sides [2]. Electron multiplication in a GEM based detector is performed by the electron avalanche inside the holes of a GEM [2]. However, the standard GEM has problems of low electron multiplication and a high fabrication cost. The thick GEM-like (THGEM) was developed to compensate for such problem. When compared with a standard GEM, the electron gain is higher and the manufacturing cost is lower due to using a general purpose PCB (printed circuit board) [3,4]. In this study, we describe the signal response of the THGEM based detector that has THGEMs with holes of various sizes.h a periodic array and is coated with a thin metallic film on both sides [2]. Electron multiplication in a GEM based detector is performed by the electron avalanche inside the holes of a GEM [2]. However, the standard GEM has problems of low electron multiplication and a high fabrication cost. The thick GEM-like (THGEM) was developed to compensate for such problem. When compared with a standard GEM, the electron gain is higher and the manufacturing cost is lower due to using a general purpose PCB (printed circuit board) [3,4]. In this study, we describe the signal response of the THGEM based detector that has THGEMs with holes of various sizes.