中国物理学会高能物理分会第十三届全国粒子物理学术会议（2021）

The under exploring Super tau-Charm facility (STCF) project, which is an electron-position operating at the center-of-mass 2~7 GeV, is a natural extension of the Beijing Spectrometer (BESIII) and will play crucial role in the high density frontier of elementary particle physics field worldwide. The PID detector in STCF located between the tracking detector, main drift chamber and the EMC, which serves an excellent PID capability for charged hadrons ($\pi^{\pm}, K^\pm$, and $p^\pm$). The effective PID over the full kinetics space in the detector acceptance is required to reach a statistical separation power better than 3 sigma to fulfill the desired physics goals. In the conceptual design, RICH detector is one suitable candidate for PID at STCF barrel region. The RICH consist of 12 identical block modules. In each module, C6F14 is chosen as the radiator, followed with light propagation zone, photo-cathode, multiplier and anode. The proximity gap is foreseen to be no larger than ~10 cm. The threshold of the RICH is less than 1 GeV/c to connect to the PID power of tracking system and can reach to 2 GeV/c. Geant4 simulations are performed to study the expected performance. By applying the reconstruction algorithm, > 3 sigma separation capability can be reached. A beam test has also been performed on our prototype.