Abstract
The Cooling Storage Ring (CSR) External-target Experiment (CEE) will be the first large-scale nuclear physics experimental device at the CSR of the Heavy-Ion Research Facility in Lanzhou (HIRFL) in China. A new T0 detector has been proposed to measure the multiplicity, angular distribution and timing information of charged particles produced in heavy-ion collisions at the target region. Multi-gap resistive plate chamber (MRPC) technology was chosen as part of the construction of the T0 detector, which provides precision event collision times (T0) and collision geometry information. The prototype was tested with hadron and heavy-ion beams to study its performance. By comparing the experimental results with a Monte Carlo simulation, the time resolution of the MRPCs are found to be better than sim 50 ps. The timing performance of the T0 detector, including both detector and readout electronics, is found to fulfil the requirements of the CEE.
Highlights
The Cooling Storage Ring (CSR) external-target experiment (CEE) has been proposed to study (1) the density dependence of nuclear symmetry energy by measuring the π −/π + ratio for various heavy-ion collision systems, (2) the equation of state (EOS) at supra-saturation density, and (3) the rich quantum chromo dynamics (QCD) phase at high-density and low-temperature
Multi-gap resistive plate chamber (MRPC), the readout electronics, the hadron and heavy ion beam test, and the results obtained from the beam test
The inner and outer layers of the T0 detector are composed of eight MRPCs, which are suitable for high precision timing and fast triggering
Summary
The CSR external-target experiment (CEE) has been proposed to study (1) the density dependence of nuclear symmetry energy by measuring the π −/π + ratio (and other relevant observables) for various heavy-ion collision systems, (2) the EOS at supra-saturation density, and (3) the rich QCD phase at high-density and low-temperature. Track length uncertainties of 0.5 and 2 cm were included in the simulation for particles hitting the iTOF and eTOF, respectively (we will write a paper to illustrate the entire simulation processs.). The simulation results are shown, for both the iTOF and eTOF, with the TOF time resolution setting at 100 ps. A TOF system with an overall time resolution of 100ps is quite adequate for pion/proton identification for the CEE. It’s noted that in Fig. 2 the 100 ps time resolution includes intrinsic contribution from both T0 detector and iTOF and eTOF detectors. In our design the intrinsic time resolution for the T0 detector needed to be < 80 ps
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