液体闪烁体衰减长度和光产额的测量

简要介绍了用于反应堆中微子实验的液体闪烁体的成分, 描述了液闪衰减长度和光产额的测量原理、方法、装置及过程, 给出了不同配比的液闪的光产额和衰减长度的测量结果, 并对液闪光产额和衰减长度的性能及影响因素进行了研究. 测量结果表明, 这些液闪可以满足中微子实验的需求.     

“活性炭表面改性及对苯的吸附研究”综合性实验设计

为加强学生对吸附单元操作基础知识的理解、提升实验研究技能,设计了“活性炭表面改性及其苯吸附性能研究”综合性实验项目。该项目设立了吸附剂基本性质分析、表面改性、吸附性能表征及动态吸附等内容,分别训练学生实验研究、实验操作、仪器表征、图谱解析及实验结果总结分析的能力。经过实验训练,学生掌握了N2吸/脱附仪、傅里叶变换红外光谱仪(FTIR)和扫描电子显微镜(SEM)的仪器操作与图谱解析方法;学会了表面改性实验及活性炭碘吸附值、亚甲基蓝吸附值和动态吸附性能测试的实验方法与结果的归纳分析;还结合所学吸附单元操作基本原理,研究揭示实验研究的规律性结果。本综合性实验在加强学生对吸附单元操作相关知识掌握的同时,能激发学生的学习兴趣、提升专业综合能力。     

Design and preliminary test results of Daya Bay RPC modules

Resistive Plate Chamber (RPC) modules will be used as one part of the cosmic muon veto system in the Daya Bay reactor neutrino experiment. A total of 189 RPC modules will cover the three water pools in the experiment. To achieve track reconstruction and high efficiency, each module consists of 4 layers, each of which contains two sizes of bare chambers. The placement of bare chambers is reversed in different layers to reduce the overlapping dead areas. The module efficiency and patch efficiency were studied both in simulation and test of the data analysis. 143 modules have been constructed and tested. The preliminary study shows that the module and patch 3 out of 4 layers efficiency reaches about 98%.     

反应堆中微子实验中的光电倍增管性能研究

介绍了对EMI公司两种8英寸光电倍增管D642KB和9350KA的研究情况; 测量了相对量子效率、线性、增益、暗电流、后脉冲和对入射光的角度响应等光电倍增管的几项主要性能, 其中相对量子效率和角度响应使用了特制的试验装置来达到测量目的; 描述了这两种光电倍增管的各单项性能.     

Study of Tyvek reflectivity in water

Tyvek is widely used as the inner lining material of water Cherenkov detectors. Therefore, information about its optical properties plays an important role in the simulation and reconstruction of particles passing through water Cherenkov detectors. In this paper, a water tank experiment is performed to study the Tyvek reflectivity in water. The so-called UNIFIED model, which is an optical model of surface reflection in Geant4, is adopted to describe the Tyvek reflectivity. Two key optical parameters are obtained from a comparison between the measured data and a Monte Carlo simulation.