HT-6M和HT-7托卡马克的多发靶丸注入试验研究

MULTI-PELLET INJECTION RESEARCH ON HT-6M AND HT-7 TOKAMAKS

最大发射能力为８ 发的多发 “原位” 靶丸注入装置已在中科院等离子体所建成。在 Ｈ Ｔ－ ７ ，中国第一座超导托卡马克和 Ｈ Ｔ－ ６ Ｍ 上进行了单发及多发试验。其差分单元及控制单元稳定可靠， 试验中测量了靶丸的尺寸和速度， 观察到显著而典型的物理现象， 实现了深度加料。加料效果显著，在单发靶丸注入时中心弦平均密度增长约５０ ％ ，双发注入时约１００ ％ 。实验中也观察到了明显的电子温度中空分布。文章介绍了系统的结构及操作，给出了实验现象及初步的物理分析结果。

One set of multi-shot`in-situ'pellet injection system,with the maximum capacity of 8 pellets during one discharge,has been constructed in the Institute of Plasma Physics,Chinese Academy of Sciences.It has been operated on HT-7 tokamak,the lst superconductive tokamak in China,and HT-6M for the single and multi-shot pellet injection experiments.Its differential section and control unit are proved to be convenient and reliable.The velocity and dimension of the pellets are measured.During the experiments,significant and typical phenomena are observed.Deep fueling is obtained.The line average eletron density in the center is increased by one half in the single pellet injection,and for 100%in the 2-pellet injection.The hollow electron temperature profile is also observed.In this paper,the structure and the operation of the multi-shot pellet injection system are introduced.Some experimental results are provided and the simple physical analysis are given.