The upgrade system of BESIII ETOF with MRPC technology

Abstract

The Beijing Spectrometer III (BESIII) endcap Time-Of-Filght (ETOF) was proposed to upgrade with Multigap Resistive Plate Chamber (MRPC) technology to substitute the current ETOF of scintillator+PMT for extending time resolutin better than 80 ps and enhance the particle identification capability to satisfy the higher precision requirement of physics. The ETOF system including MRPC modules, front end electronics (FEE), CLOCK module, fast control boards and time to digital modules (TDIG), has been designed, constructed and done some experimental tests seperately. Aiming at examining the quality of entire ETOF system and training the operation of all participated parts, a cosmic ray test system was built at the laboratory and underwent about three months to guarantee performance. In this paper the results will be presented indicating that the entire ETOF system works well and satisfies the requirements of the upgrade.

The BESIII physics programme

“…The TOF system time resolution is 68 ps in the barrel region and 110 ps in the endcaps. In 2015, the endcap TOF scintillators were replaced with a system of multi-layer RPCs that improved the time resolution to 60 ps [204].…”

Study of the decays Ds+→KS0K+ and KL0Ablikim1, Ачасов2, Adlarson3 et al. 2019Phys. Rev. DSelf Cite11030View full textAdd to dashboardCite

“…These subdetectors are immersed in a magnetic field of 1 T, produced by a superconducting solenoid, and are surrounded by a multilayered resistive-plate chamber (RPC) system interleaved in the steel flux return of the solenoid, providing muon identification. In 2015, BESIII was upgraded by replacing the two end-cap TOF systems with multigap RPCs, which achieve a time resolution of 60 ps [18]. A detailed description of the BESIII detector is presented in Ref.…”

Observation of the W -annihilation decay Ds+→ωπAblikim1, Ачасов2, Ahmed3 et al. 2019Phys. Rev. DSelf Cite11050View full textAdd to dashboardCite

“…[10]. Two endcap time-of-flight systems were later upgraded with multigap resistive plate chambers [11]. Simulations of BESIII detector are based on GEANT4 [12].…”