Hybrid-kinetic simulation of synergy between fishbone/sawtooth and tearing mode induced energetic-ion transport in a tokamak plasma
Hybrid-kinetic simulation of synergy between fishbone/sawtooth and tearing mode induced energetic-ion transport in a tokamak plasma
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托卡马克等离子体中鱼骨/锯齿与撕裂模式诱导高能离子输运协同作用的混合动力学模拟
DOI：
10.1088/1741-4326/acb221
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发表时间：
2023
期刊：
影响因子：
3.3
通讯作者：
Zheng-Xiong Wang
中科院分区：
文献类型：
--
作者：
Xiaolong Zhu;Liming Yu;Wei Chen;Peiwan Shi;Wanling Ge;Feng Wang;Qinbin Luan;Hongen Sun;Zheng-Xiong Wang
抽象的。在HL-2A装置的NBI加热高密度等离子体中，最近观察到m/n = 2/1撕裂模（TM）与m/n = 1/1鱼刺/鱼刺塌缩重分布能量离子的共振相互作用，其中m为极向模数，n为环向模数。该事件本质上是由具有多模式性质的典型协同效应引起的。理解这种实验现象，特别是在使用高功率辅助加热时，对于在未来的热核聚变反应堆中获得高约束、高β N的高性能等离子体是至关重要的。本文基于HL-2A装置上鱼骨/双金属与TM协同作用的典型实验现象，利用协同作用发生前的实验参数和剖面作为程序M3 D-K的输入，进行了自洽非线性混合动力学模拟。特别是，我们主要集中在相空间传输，损失和重新分配的能量离子诱导的两种情况下，一个只有m/n = 2/1 TM和一个与m/n = 1/1鱼骨/双和m/n = 2/1 TM之间的协同作用。结果表明，鱼骨形结构与m/n = 2/1 TM的协同作用对能量离子的输运、损失和再分布具有重要意义，与m/n = 2/1 TM的情况相比，能显著提高能量离子的损失率。这是由于这样的事实，这种协同作用可以打开一个有效的能量离子损失通道，连接等离子体中心和边缘。对这两种情况下能量离子的相空间输运和重分布进行了详细的分析和比较。这些发现表明，协同作用引发的质子崩溃是灾难性的，可以帮助我们了解在未来的反应堆级装置，如国际热核聚变实验堆协同诱导能量离子输运的潜在机制。
Abstract. The resonant interaction between m/n = 2/1 tearing mode (TM) and energetic-ions redistributed by m/n = 1/1 fishbone/sawtooth collapse is evidently observed recently in HL-2A NBI-heated high-density plasmas, where m is poloidal mode number and n is toroidal mode number. This event essentially results from a typical synergistic effect with multiple-mode nature. Understanding such experimental phenomenon, especially when using high-power auxiliary heating, is crucial for achieving the high-performance plasmas with high confinement and high β N in the prospective thermonuclear fusion reactors. In this work, based on the typical experimental phenomenon of synergy between fishbone/sawtooth and TM on HL-2A, a self-consistent nonlinear hybrid-kinetic simulation is conducted utilizing the experimental parameters and profiles before the occurrence of this synergy as the code M3D-K input. In particular, we focus chiefly on the phase-space transport, loss and redistribution of energetic-ions induced by two cases, one with only m/n = 2/1 TM and one with the synergy between m/n = 1/1 fishbone/sawtooth and m/n = 2/1 TM. It is found that the synergy of the fishbone/sawtooth and m/n = 2/1 TM on eneregtic-ion transport, loss and redistribution is significantly important and can dramatically enhance the loss rate of energetic- ions compared with the case with only m/n = 2/1 TM. It is due to the fact that such synergy can open up an efficient energetic-ion loss channel which connects the plasma center and edge. The phase space transport and redistribution of energetic-ions induced by the two different cases are also respectively analyzed and compared in detail. These findings indicate that the synergy triggering the sawtooth collapse is catastrophic and can help us understand the underlying mechanisms of synergy induced energetic-ion transport in the future reactor-grade devices such as International Thermonuclear Experimental Reactor.