Simulations of fast component and slow component of SMBI on HL-2A tokamak
Simulations of fast component and slow component of SMBI on HL-2A tokamak
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DOI：
10.1088/1674-1056/26/5/055201
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发表时间：
2017-05
影响因子：
1.7
通讯作者：
Yong Shi;Zhanhui Wang;Q. Ren;A. Sun;D. Yu;Wenfeng Guo;Min Xu
中科院分区：
文献类型：
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作者：
Yong Shi;Zhanhui Wang;Q. Ren;A. Sun;D. Yu;Wenfeng Guo;Min Xu
提高超声分子束注入的穿透深度和燃料加注效率对于下一代聚变装置如ITER具有重要意义。在HL-2A的SMBI实验中，已经观察到快组分（FC）和慢组分（SC）两种组分，其中快组分的穿透深度远大于普通SMBI，这引起了人们对更好的加料方法的关注。本文首次利用BOUT++程序中的trans-neut模块对SMBI的FC和SC进行了理论和仿真分析。仿真结果与实验结果一致，清晰可辨。对于FC和SC的主要机理，研究发现，虽然注入速度的差异对FC和SC的穿透深度差异有一定的影响，但这主要是由第一电离SMB的自阻塞效应引起的。讨论了初始等离子体密度对FC和SC的影响，以及SC穿透深度随注入速度的变化。
It is very important to improve the penetration depth and fueling efficiency of supersonic molecular beam injection (SMBI) especially for the next generation fusion devices such as ITER. Two components, a fast component (FC) and a slow component (SC), have been observed in the HL-2A SMBI experiments for several years, and the FC can penetrate much more deeply than the common SMBIs which draws a great deal of attention for a better fueling method. It is the first time to the FC and SC of SMBI have been simulated and interpreted in theory and simulation in this paper with the trans-neut module of the BOUT++ code. The simulation results of the FC and SC are clear and distinguishable in the same way as the observation in experiment. For the major mechanism of the FC and SC, it is found that although the difference in the injection velocity has some effect on the penetration depth difference between the FC and SC, it is mainly caused by the self-blocking effect of the first ionized SMB. We also discuss the influence of the initial plasma density on the FC and SC, and the variation of the SC penetration depth with its injection velocity.