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.Con-sidering that there will be a large number(～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 require-ments of the readout electronics are explored,the down-selection 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 proto-type readout electronics,and the results indicate that the time resolution is better than～1 ns(RMS)when the input charge is greater than～12 fC based on the APV25 chip,while the time resolution is better than～1 ns(RMS)at an input charge of over～48 fC based on the AGET and STCF ASIC chips,and the equivalent noise charge is better than～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.

State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China,Hefei 230026,China;Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China;School of Information Engineering,Southwest University of Science and Technology,Mianyang 621010,China

[1]Bao-Lin Hou;Lei Zhao;Jia-Jun Qin;Ye-Qun Qi;Jia-Ming Li;Zi-Yu Yang;Shu-Bin Liu;Qi An-.Prototype of the readout electronics for the RICH PID detector in the STCF)[J].核技术（英文版）,2022(06):148-160

RICH,STCF,micromegas,APV25,AGET

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