mTOF performance during mCBM beam time at GSI

TL;DR

This paper reports on the performance testing of multi-gap resistive plate chambers (MRPCs) used in the mCBM system at GSI, demonstrating their suitability for high-rate particle detection in the upcoming FAIR facility.

Contribution

It presents the first performance evaluation of high-rate MRPC prototypes developed at Tsinghua University and USTC in the context of the mCBM system at GSI.

Findings

High-rate MRPC2 prototypes showed excellent timing resolution.

MRPC3 from USTC performed well in lower rate regions.

The tracking method effectively analyzed detector performance.

Abstract

The future Facility for Anti-proton and Ion Research (FAIR), currently in construction in Darmstadt, Germany, is one of the largest research projects worldwide. The Compressed Baryonic Matter (CBM) experiment is one of the main pillars at FAIR, studying the quantum chromodynamics (QCD) phase diagram at high baryon densities with unprecedented interaction rate in heavy ion collisions up to 10 MHz. This requires new data-driven readout chain, new data analysis methods and high-rate capable detector systems. The task of the CBM Time of Flight wall (CBM-TOF) is the charged particle identification. Multi-gap Resistive Plate Chambers (MRPCs) with different rate capabilities will be used at CBM-TOF corresponding regions. To reduce the commissioning time for CBM, a CBM full system test-setup called mini-CBM (mCBM) had been installed and tested with beams at GSI SIS18 facility in 2019. The high-rate MRPC prototypes developed at Tsinghua University, called MRPC2, were selected to be implemented in mTOF modules for mCBM. Additional thin float glass MRPCs from USTC called MRPC3, foreseen for the CBM lower rate region, were also tested in the mCBM experiment. Performance results of the two kinds of MRPCs analyzed by the so called tracking method will be shown.