THGEMs (THick Gas Electron Multiplier) of varying thickness, hole diameter and hole pitch have been studied. For a thinner-THGEM of thickness 0.2 mm, with hole diameter 0.2 mm, pitch 0.2 mm and narrow (5-10 μm) rim, the performance of gain versus high voltage with different gas mixtures have been studied using 5.9 keV X-rays. In general, a gain of around 3×10 3 was obtained with a single board in Ar/iC 4 H 10, and gains higher than 10 4 were obtained in Ne mixture at lower voltage. The dependence of the energy resolution on the drift and induction electric fields was measured and an energy resolution of 15.9% was obtained. A curved thinner-THGEM chamber with one-dimensional readout has been assembled for use in the diffraction studies at the Beijing Synchrotron Radiation Facility (BSRF). A cosmic-ray muon hodoscope based on thinner-THGEM was developed as a teaching experiment for the Graduate University of the Chinese Academy of Sciences (GUCAS).
The performance of thinner-THGEMs (Thick Gaseous Electron Multipliers) with 0.2 mm thickness, 0.2 mm hole diameter, 0.7 mm pitch and a narrow (5 ∼ 20 μm) rim has been studied. In general, the prototype has a gain of 1 × 103 ∼ 4 with one single thinner-THGEM in Ar/iC4H10 (97:3) and works stably at high rates. A curved parallax-free gas detector based on thinner-THGEM has been developed for diffraction studies, and has been tested at the Beijing Synchrotron Radiation Facility (BSRF). The result shows an angular resolution of 0.148 degree can be achieved with direct current data acquisition mode.
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