北京大学4.5 MV静电加速器核反应分析系统

为满足对聚变堆面向等离子体材料中氘氚滞留问题的研究，北京大学4.5 MV静电加速器在原束线基础上新增核反应分析系统，该系统使用能量0.8～3.6 MeV的H⁺、D⁺、³He⁺和⁴He⁺粒子束流，可对核反应微分截面和样品中元素浓度的深度分布进行测量分析。本文对核反应分析原理、核反应分析系统的设备布局和实验方法进行了讨论，并以D(³He,p)⁴He核反应为例，分析了微分截面计算和样品中氘元素浓度深度分布的数据结果，其深度分辨小于1.5 μm，实验误差约为7.5%。

Nuclear Reaction Analysis System of 4.5 MV Electrostatic Accelerator at Peking University

In order to satisfy the research of the deuterium and tritium retention in plasma facing components of fusion reactor, a nuclear reaction analysis system was designed and installed based on the original beam line of 4.5 MV electrostatic accelerator at Peking University. With this nuclear reaction analysis system, H⁺, D⁺, ³He⁺ and ⁴He⁺ beams can be provided in the ion energy range from 0.8 MeV to 3.6 MeV. The differential cross section of the nuclear reaction and the depth distribution of the element concentration in samples can be achieved by this system. The principle of nuclear reaction analysis, the equipment layout and the experiment method were discussed, and the data analysis results of D(³He,p)⁴He nuclear reaction were shown as application examples of this system. In addition, the depth resolution of less than 1.5 μm and the experimental error of 7.5% were achieved with this system.