Comparative study on charging-up of single, double and triple Gas Electron Multipliers (GEM)

Abstract

In this paper, a detailed investigation has been carried out to understand the physics behind GEM charging-up and its effects on gain. Experiments have been performed on both double and triple GEM with the help of 55 Fe x-ray source and a comparative study of these configurations along with the single GEM results observed in our previous work, has been reported. The increase in gain due to polarization of GEM foil dielectric and reduction in gain due to charge accumulation on dielectric are studied in detail with variation in parameters, like field configuration and radiation rate.