2024/07/29 by Zhao, Yiding, Hu, D., Shao, M. +7
#FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det)
paper · doi:10.48550/arxiv.2407.19720
To meet the need for a high counting rate and high time resolution in future high-energy physics experiments, a prototype of a gas photodetector with an RPC structure was developed. Garfield++ simulated the detector's performance, and the single photoelectron performance of different mixed gases was tested with an ultraviolet laser. The detector uses a low resistivity (∼1.4⋅ 1010 Ω⋅ cm) float glass so that its rate capability is significantly higher than that of ordinary float glass(1012∼1014 Ω⋅ cm), the laser test results show that in MRPC gas(R134a/iC4H10/SF6(85/10/5)), the single photoelectron time resolution is best to reach 20.3 ps at a gas gain of 7⋅ 106. Increasing the proportion of iC4H10 can effectively reduce the probability of photon feedback, without changing the time resolution and maximum gain. In addition to being applied to high-precision time measurement scenarios (eg:T0, TOF), the detector can also quantitatively test the single photoelectron performance of different gases and will be used to find eco-friendly MRPC gases.