Prototype of the readout electronics for the RICH PID detector in the STCF

The ring imaging Cherenkov (RICH) detector for particle identification (PID) is being evaluated for the future super tau-charm facility (STCF) complex. In this work, the prototype readout electronics for the RICH PID detector is designed. The prototype RICH PID detector is based on a thick gas electron multiplier combined with a micromegas detector for Cherenkov light detection. Considering that there will be a large number ( similar to 690,000) of detector channels in future RICH detector, the readout electronics faces many challenges to precisely measuring time and charge information, such as reducing the noise, increasing density, and improving precision. The requirements of the readout electronics are explored, the downselection of the ASICs is made and thus a prototype readout electronics is designed and implemented. Tests are also conducted to evaluate the performance of the prototype readout electronics, and the results indicate that the time resolution is better than similar to 1 ns (RMS) when the input charge is greater than similar to 12 fC based on the APV25 chip, while the time resolution is better than similar to 1 ns (RMS) at an input charge of over similar to 48 fC based on the AGET and STCF ASIC chips, and the equivalent noise charge is better than similar to 0.5 fC (RMS) @ 20 pF based on the three ASICs. The test results indicate that the prototype readout electronics design meets the requirement of the future RICH PID detector and thus provides a reference for future engineering.