论文标题
CEE内TOF原型设计和初步测试结果
CEE inner TOF prototype design and preliminary test results
论文作者
论文摘要
冷却存储环（CSR）外部目标实验（CEE）是第一个在中国兰州重型离子研究设施（HIRFL-CSR）在GEV能量范围内运行的多功能核物理实验装置。 CEE的主要目标是研究密集物质的批量特性，并通过测量目标区域的重离子碰撞中产生的带电颗粒，并以大量认可来了解量子铬动态（QCD）相图。已经提出了一个内部飞行时间（ITOF）系统来测量带电粒子的多样性，角度分布和时间信息。在此，我们根据计算和GEANT4模拟介绍ITOF的性能要求。所提出的系统的特征是高粒度和时间性能，因此，ITOF壁的概念设计采用高粒度多间隙电阻板室（MRPC），时间分辨率约为30 ps。为了评估MRPC设计，进行了宇宙射线测试。正如宇宙射线Geant4对时间抖动组件的模拟所解释的那样，MIP的定时分辨率大于28 PS，并且MIP的效率优于98％。
The Cooling Storage Ring (CSR) External-target Experiment(CEE) is the first multi-purpose nuclear physics experimental device to operate in the GeV energy range at the Heavy-Ion Research Facility(HIRFL-CSR) in Lanzhou, China. The primary goals of the CEE are to study the bulk properties of dense matter and to understand the quantum chromo-dynamic (QCD) phase diagram by measuring the charged particles produced in heavy-ion collisions at the target region with a large acceptance. An inner time of flight (iTOF) system has been proposed to measure the multiplicity, angular distribution, and time information of the charged particles. Herein, we introduce the performance requirements of iTOF according to calculations and GEANT4 simulations. The proposed system is characterized by high granularity and time performance, hence, the conceptual design of the iTOF wall adopts high granularity Multi-gap Resistive Plate Chambers (MRPC) with a time resolution of around 30 ps. To evaluate the MRPC design, the cosmic ray test was performed. A timing resolution better than 28 ps and an efficiency better than 98% has been achieved for MIPs, as interpreted by the cosmic ray GEANT4 simulation of time jitter components.
