探测器性能研究

衡月昆++祁鸣++杨长根++张家文++胡涛

摘 要：大亞湾中微子实验是一个异地建设的实验，中心探测器和反符合探测器的运行和维护要采取现场值班监控、远程网络检查相结合的办法，oncall人员要及时跟踪关键监测数据，准备各种配件、部件、仪器和设备，以备有问题时及时更换。大亚湾实验探测器由两部分构成：一是探测反应堆反电子中微子的中微子探测器，即“中心探测器”；二是探测宇宙线本底的μ子探测器，即“反符合系统”。反符合系统包括两个独立的探测器：阻性板探测器（RPC）和水切伦科夫探测器，可以相互检验并联合确定μ 子探测效率。水切伦科夫探测器选择纯净水作为介质，在探测宇宙线μ子的同时作为屏蔽介质，中心探测器置于其中。对于远点有四个中心探测器模块，对于两个近点有两个中心探测器模块。阻性板探测器（RPC）放置于水切仑科夫探测器上方，由多个模块交叠铺放以放置探测死区，每个模块内有4层阻性板探测器。探测器的优异性能是高水平物理研究的基础。为保证高质量的数据，需要长期运行和维护探测器，理解探测器响应，通过数据分析研究并提升探测器性能。关于探测器性能的研究，我们将采取实验获取数据、刻度数据和计算机模拟相结合进行分析的方法。大亚湾的探测器从时间上要运行5～10年，从空间上包括3个厅的多个探测器，所以，我们也将从时间和空间上进行比对研究。关于液闪的研究，我们将把研究对象分为两类进行不同研究：一是已经安装入探测器的液闪，这个我们要跟踪分析其性能的变化；二是安装探测器后剩余的液闪和小模型试验的液闪，我们可以进行独立的物理化学性能研究。

关键词：大亚湾 中心探测器 阻性板探测器 反符合探测器 性能

Detector Performance Research

Heng Yuekun1 Qi Ming2 Yang Changgen1 Zhang Jiawen1 Hu Tao1

（1.Institute of High Energy Physics， Chinese Academy of Sciences； 2.Nanjing University）

Abstract：Daya Bay Reactor Neutrino Experiment is a remote built experiment， so the operation and maintenance of its center detector and coincidence detector need to take the combination of field monitoring， remote network examination on duty， and the oncall personnel have to track the monitoring data in time， prepare all kinds of accessories， components， instruments and equipment to replace timely in case some problems occur. Daya bay detector consists of two parts， one is the detectors to detect the electron neutrino of reactor neutrino， namely "the center detector"； the other one is the detectors of cosmic ray muon background， namely "anticoincidence system". Anticoincidence system consists of two separate detector： impedance plate detector （RPC） and water cerenkov detector， which can check with each other and jointly determine the muon detection efficiency. Pure water is as the medium of water Cerenkov detector， is also as shielding medium in the detection of cosmic ray muonsm， and the center detector is in it. There is four center detector modules to the far point and two to close point. Impedance plate detector （RPC） is placed above the water Cerenkov detector， and multiple modules which each module contains 4 layer resistance plate detector are overlapped in place of the dead detect zone. The excellent properties of the detector are the foundation of the high level of physical research. In order to guarantee the high quality of the data， long-term operation and maintenance of the detector， ideal detector response， data analysis study and improvement of the detector performance are needed. For the research on detector performance， we will analysis the data include the experimental， calibration and computer simulation. Also we will compare research on space and time because the Daya bay detector is from 5 to 10 years to run on time， and includes three hall of multiple detectors on the space. On the research of liquid scintillator， we will put the research object divided into two categories to different studies， one is the liquid scintillator which is installed into the detector and we need to track and analyze the change of its performance； the other one is liquid scintillator which is the rest after the install of detector and small model test of liquid scintillator， this is we can make the physical and chemical properties of independent research.

Key Words：Daya bay； Central detector； Impedance plate detector； Coincidence detector； Performance