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The Gas Electron Multiplier (GEM) detector is one of promising particle andradiation detectors that has been improved greatly from previous gas detectors.The improvement includes better spatial resolutions, higher detection ratecapabilities, and flexibilities in designs. In particular, the 10 cm x 10 cmGEM prototype is designed and provided by the Gas Detectors Development group(GDD) at CERN, Switzerland. With its simplicity in operations and designs,while still maintaining high qualities, the GEM prototype is suitable for bothstart-up and advanced researches. This article aims to report theinvestigations on some important properties of the 10 cm x 10 cm GEM detectorusing current measurement and signal counting. Results have shown that gains ofthe GEM prototype exponentially increase as voltage supplied to the detectorincreases, while the detector reaches full efficiency (plateau region) when thevoltage is greater than 4100 V. In terms of signal sharing between X and Ystrips of the readout, X strips, which is on the top layer of the readout,collect ~57% of the total signal. For the uniformity test, the GEM prototypehas slightly higher efficiencies at the center of the detector and decreases aspositions are closer to edges.

Investigations on Important Properties of the 10 cm x 10 cm GEM Prototype