Experimental study on the performance of a THGEM detector for X-rays

By expanding the applications of GEM detectors, a newer pattern of such detectors was introduced in ۲۰۰۴, named THGEM detectors. In this work, a sample of an X-ray detector was designed and constructed using ۲cm×۲cm THGEMs domestically produced with a thickness of ۲۵۰ μm, a hole diameter of ۳۰۰ μm and a pitch of ۵۰۰ μm, for the first time. The triple THGEM detector working in Ar/CO۲ gas mixture was characterized. Influence of gas pressure and gas mixture on gain of the detector was investigated. Results show the detector operated in a stable mode with no discharges. The gain of the detector increased with high voltage across the THGEM electrodes exponentially. This verified the performance of a detector as a proportional counter. Also, the detector’s gain is maximum at Ar/CO۲ (۸۰/۲۰) gas mixture and voltage of ۷۰۰ V applied to each multiplier. The detector is promising for localization applications such as particle physics experiments.

کلیدواژه ها:

X-ray detection ، Gaseous detector ، Micropattern ، THGEM