A high rate and high timing photoelectric detector prototype with RPC structure

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.