Abstract
In this paper the new endcap Time-of-Flight system (ETOF) of BESIII experiment at the IHEP is described. The new detector module is composed of multi-gap resistive plate chamber (MRPC) with the gas mixture 90% Freon+5% S[Formula: see text]+5% iso-[Formula: see text]. The whole system including the detectors, the gas system, the high voltage (HV) system, the readout electronics system is described. Finally the installation and commissioning of the whole system is introduced briefly. After the calibration with Bhabha events, the very promising time resolutions of 69 and 60 ps for one-end and two-ends of MRPCs are obtained. The average detection efficiency of two-ends is about 97.5%.
Highlights
The Beijing Spectrometer III (BESIII) experiment[1] studies e+-e− collisions in the τ -charm energy region at the Beijing Electron and Positron Collider II (BEPCII)[2]
The BESIII detector consists of a high precision drift chamber, Time-Of-Flight counters (TOF), a 1 T superconducting solenoid magnet, a CsI crystal Electromagnetic Calorimeter (EMC) and a muon identifier chamber (MUC)
The multi-gap resistive plate chamber (MRPC) for the BESIII endcap time-of-flight (ETOF) are designed as double-stack strips
Summary
The BESIII experiment[1] studies e+-e− collisions in the τ -charm energy region at the Beijing Electron and Positron Collider II (BEPCII)[2]. One significant reason that can worsen the ETOF resolution is the multiple scattering of particles in the thick aluminium This is an Open Access article published by World Scientific Publishing Company. It is possible to apply a very intense electric field and still operate the device in avalanche mode with many advantages in terms of time resolution and rate capability It has been used successfully as TOF detectors in several experiments, such as ALICE at LHC5–6, STAR at RHIC7–8, with the time resolution of 80-90 ps. The effective areas of the MRPC rings have inner radius of 478 mm and outer radius 822 mm
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