长脉冲高功率托卡马克上低能中性粒子产生机制研究

低能中性粒子对第一壁材料的腐蚀直接影响未来国际热核聚变装置ITER第一壁寿命及氚滞留速率，是ITER非常关心的热点问题之一。针对长脉冲、高功率运行条件下低能中性粒子产生机制不清楚，本申请利用低能中性粒子分析仪，在与ITER结构和功能基本相似的EAST托卡马克上，测量低能中性粒子通量大小、能量分布及其随时间演化过程，深入研究中性束注入、离子回旋波等不同加热方式，充气、弹丸注入、超声分子注入等不同加料方式，不同偏滤器运行模式，低约束模和高约束模转换、边界局域模爆发等对低能中性粒子产生的影响规律，结合边界等离子体输运程序OEDGE对EAST实验结果的模拟，阐明长脉冲、高功率运行条件下低能中性粒子产生物理机制。在此基础上模拟ITER装置低能中性粒子产生及其在第一壁不同极向位置的分布，为ITER和未来聚变堆的运行提供科学依据和数据积累。

The erosion of first wall material by low energy neutral particles which is directly related to first wall material lifetime and tritium retention rate of future international fusion reactor ITER, is one of the hot issues that ITER is very concerned about. In view of that the generation mechanism of low energy neutral particles in long pulse and high power operation mode is unclear, this application uses low energy neutral particle analyzer to measure the flux, energy distribution and their evolution over time of low energy neutral particles on EAST tokamak which has similar structure and function with ITER, studying the generation law of low-energy neutral particle based on different heating modes such as neutral beam injection, ion cyclotron resonance heating and etc., different feeding modes such as air inflation, pellet injection, supersonic molecular beam injection and etc., different divertor operation modes, L-H transition and ELMs burst, illustrating the generation physical mechanism of low energy neutral particle in long pulse and high power operation mode combining EAST experimental results simulation by the boundary plasma transport program OEDGE. On the basis of this, the generation and distribution of low energy neutral particles at different poloidal positions on the first wall in ITER will be simulated and this research can provide scientific basis and experience accumulation for the operation of ITER and future fusion reactors.