Characteristic study of a quadruple GEM detector in different electric field configurations

Abstract A quadruple GEM detector has been assembled and operated using Ar/CO 2 90:10 and 70:30 gas mixtures. Detailed study of the effective gain and energy resolution of the detector are performed using the X-ray spectrum of 55 Fe source. The gain and energy resolution of the detector are measured and compared for two different electric field configurations, the standard field setting and the ion backflow ( IBF ) field setting. It is observed that for the standard field configuration the quadruple GEM detector can operate at lower operating voltages and has better energy resolution compared to IBF field setting.