Mechanism of edge localized mode mitigation by resonant magnetic perturbations.
Mechanism of edge localized mode mitigation by resonant magnetic perturbations.
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DOI：
10.1103/physrevlett.113.115001
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发表时间：
2014-09
影响因子：
8.6
通讯作者：
M. Becoulet;F. Orain;Gta Guido Huijsmans;S. Pamela;P. Cahyna;M. Hoelzl;X. Garbet;E. Franck;E. Sonnendrücker;G. Dif-Pradalier;C. Passeron;G. Latu;J. Morales;E. Nardon;A. Fil;B. Nkonga;A. Ratnani;V. Grandgirard
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文献类型：
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作者：
M. Becoulet;F. Orain;Gta Guido Huijsmans;S. Pamela;P. Cahyna;M. Hoelzl;X. Garbet;E. Franck;E. Sonnendrücker;G. Dif-Pradalier;C. Passeron;G. Latu;J. Morales;E. Nardon;A. Fil;B. Nkonga;A. Ratnani;V. Grandgirard
基于Jorek程序的非线性电阻磁流体动力学模拟结果，模拟中采用了真实的类JET等离子体参数和主环数n=2的JET误差场校正线圈（EFCC）的RMP谱，提出了共振磁扰动（RMP）抑制边缘局域模（ELMs）的可能机制.没有RMP，一个大的ELM弛豫主要是由于最不稳定的介质n气球模式。外部施加的RMP非线性地驱动耦合到n=2 RMP的模式，这产生小的多模弛豫，减轻ELMs。由RMP驱动的模式表现出撕裂状结构，并产生额外的岛屿。减轻的ELM将存款能量主要在由n=2个RMP创建的结构（“足迹”）中沉积到偏滤器中，然而，由其他非线性驱动的偶次谐波略微调制。偏滤器功率通量在ELM阶段减轻RMP减少了几乎10倍。ELM缓解的机制，这里提出的RMP再现高碰撞性RMP实验的一般功能，其中大ELMs被替换为小，更频繁的ELMs或磁湍流。在较高RMP幅度下的建模中也证明了总ELM抑制。
A possible mechanism of edge localized modes (ELMs) mitigation by resonant magnetic perturbations (RMPs) is proposed based on the results of nonlinear resistive magnetohydrodynamic modeling using the jorek code, realistic JET-like plasma parameters and an RMP spectrum of JET error-field correction coils (EFCC) with a main toroidal number n=2 were used in the simulations. Without RMPs, a large ELM relaxation is obtained mainly due to the most unstable medium-n ballooning mode. The externally imposed RMP drives nonlinearly the modes coupled to n=2 RMP which produce small multimode relaxations, mitigated ELMs. The modes driven by RMPs exhibit a tearinglike structure and produce additional islands. Mitigated ELMs deposit energy into the divertor mainly in the structures ("footprints") created by n=2 RMPs, however, slightly modulated by other nonlinearly driven even harmonics. The divertor power flux during a ELM phase mitigated by RMPs is reduced almost by a factor of 10. The mechanism of ELM mitigation by RMPs proposed here reproduces generic features of high collisionality RMP experiments, where large ELMs are replaced by small, much more frequent ELMs or magnetic turbulence. Total ELM suppression was also demonstrated in modeling at higher RMP amplitude.