60 / 2024-07-11 22:10:42

Study of MPGD based photon detectors for the STCFRICH system

RICH system,STCF, MPGD

The Super τ-Charm Facility (STCF) is a high-luminosity electron-positron collider under development in China, following the BEPCII. The STCF requires better particle identification for charged hadrons within its energy range, necessitating a ≥3σ resolution for π/K identification at momentum ranges of 2GeV/c and below. To meet these stringent requirements, a Cherenkov detector has been selected as the particle identification detector for the STCF. Our research focuses on a micro-pattern gas detector based on THGEM combined with Micromegas. This setup fulfills the RICH (Ring Imaging Cherenkov) detector's demands for a photon detector, providing high gain, large area coverage, and high counting rate capabilities. The Micromegas component has been specifically developed using a thermal bonding technique, and the THGEM utilizes a copper reduction process in order to enhance voltage resistance and increase the surface area of the photocathode coating. We have successfully developed a 32cm×32cm RICH detector, achieving a gain of up to 10^5 with a gain uniformity better than 20%. Cherenkov radiation photoelectrons can be detected by plating CsI (Cesium Iodide) on the THGEM as a photocathode. Furthermore, we are exploring the development of a novel photon detector based on a double micro-mesh gaseous structure(DMM). This new detector aims to provide better time resolution, lower ion feedback, and higher gain. We have successfully developed a 32cm×32cm DMM detector, and its gain uniformity is better than 20%.