A GEANT4 Simulation Studyof BESIII endcap TOF Upgrade

TL;DR

This study uses GEANT4 simulations to evaluate and improve the BESIII Endcap TOF detector, demonstrating that MRPC technology significantly reduces multi-hit rates and enhances timing performance for the upgrade.

Contribution

The paper presents a GEANT4 simulation model showing that MRPC detectors outperform scintillator-based ones in reducing multi-hit rates and improving timing for BESIII ETOF upgrade.

Findings

MRPC reduces multi-hit rate from 71.5% to around 17-22%.

MRPC improves timing performance of the ETOF.

Simulation guides the ETOF upgrade at BESIII.

Abstract

A GEANT4-based Monte-Carlo model is developed to study the performance of Endcap Time-Of-Flight (ETOF) at BESIII. It's found that the multiple scattering effects, mainly from the materials at the MDC endcap, can cause multi-hit on the ETOF's readout cell and significantly influence the timing property of ETOF. Multi-gap Resistive Plate Chamber (MRPC) with a smaller readout cell structure is more suitable for ETOF detector due to significantly reduced multi-hit rate, from 71.5% for currently-used scintillator-based ETOF to 21.8% or 16.7% for MRPC-based ETOF, depending on the readout pad size used. The timing performance of a MRPC ETOF is also improved. These simulation results suggest and guide an ETOF upgrade effort at BESIII.