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Gas Electron Multipliers (GEM) are among the more prominent Micro-PatternGaseous Detectors (MPGDs) and widely used in high energy particle physicsexperiments and various related applications. Adoption of different productiontechniques lead to holes of varying geometries in GEM foils. Since the responseof a GEM-based detector is closely related to the hole geometry through theinfluence of the latter on charge sharing and transport through GEM foils,attempts have been made to relate hole configurations to different figures ofmerit of a detector. Numerical simulations have been performed to study theeffects of hole geometry on important parameters such as charge sharing,collection efficiency, extraction efficiency, gain, possibility of transitionfrom avalanche to streamer modes for single, double and triple layer GEMdetectors. The numerical estimates have been compared to available experimentaldata. The comparisons, although not always in agreement, are found to begenerally encouraging.

Effect of hole geometry on charge sharing and other parameters in GEM-based detectors