Performance studies of MRPC prototypes for CBM

TL;DR

This paper evaluates the performance of two MRPC prototypes with different configurations for the CBM experiment's ToF detector, focusing on efficiency and time resolution tested with heavy-ion beams.

Contribution

It presents the development and testing results of two novel MRPC prototypes with different stack configurations for the CBM experiment.

Findings

HD-P2 achieved high efficiency and good time resolution.

THU-strip demonstrated comparable performance with a double-stack design.

Both prototypes are suitable candidates for the CBM ToF wall.

Abstract

Multi-gap Resistive Plate Chambers (MRPCs) with multi-strip readout are considered to be the optimal detector candidate for the Time-of-Flight (ToF) wall in the Compressed Baryonic Matter (CBM) experiment. In the R&D phase MRPCs with different granularities, low-resistive materials and high voltage stack configurations were developed and tested. Here, we focus on two prototypes called HD-P2 and THU-strip, both with strips of 27 cm$^2$ length and low-resistive glass electrodes. The HD-P2 prototype has a single-stack configuration with 8 gaps while the THU-strip prototype is constructed in a double-stack configuration with 2 $\times$ 4 gaps. The performance results of these counters in terms of efficiency and time resolution carried out in a test beam time with heavy-ion beam at GSI in 2014 are presented in this proceeding.