Effect of resonant magnetic perturbations on COMPASS-C tokamak discharges
Effect of resonant magnetic perturbations on COMPASS-C tokamak discharges
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DOI：
10.1088/0029-5515/32/12/i02
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发表时间：
1992-12
期刊：
影响因子：
3.3
通讯作者：
T. Hender;R. Fitzpatrick;A. Morris;P. Carolan;R. Durst;T. Edlington;J. Ferreira;S. Fielding;P. Haynes;J. Hugill;I. Jenkins;R. L. Haye;B. J. Parham;D. Robinson;T. Todd;M. Valovic;G. Vayakis
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文献类型：
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作者：
T. Hender;R. Fitzpatrick;A. Morris;P. Carolan;R. Durst;T. Edlington;J. Ferreira;S. Fielding;P. Haynes;J. Hugill;I. Jenkins;R. L. Haye;B. J. Parham;D. Robinson;T. Todd;M. Valovic;G. Vayakis
COMPASS-C托卡马克装置的实验结果揭示了一个明显的振幅阈值，在该阈值以上，外加静态共振磁扰动（RMP）会诱导出静止磁岛。这样的岛（特别是，m=2，n=1岛）引起能量和粒子约束的显著退化，抑制了杂质离子的振荡和杂质离子环向速度的大的变化。观察到的阈值诱导固定（2，1）岛是一致的现象学的电阻MHD模型，考虑到等离子体旋转（包括极向流阻尼）和外部施加的谐振场。对于除m=2，n=1以外的应用场，发现了广泛类似的结果。RMP实验的其他结果也进行了讨论，如稳定的旋转MHD活动，刺激破坏和扩展的破坏性密度极限。最后，根据COMPASS-C的结果，简要地分析了场误差对大型托卡马克的可能影响
Experimental results from the COMPASS-C tokamak reveal a sharp threshold in amplitude above which externally applied static resonant magnetic perturbations (RMPs) induce stationary magnetic islands. Such islands (in particular, m=2, n=1 islands) give rise to a significant degradation in energy and particle confinement, suppression of the sawtooth oscillation and a large change in the impurity ion toroidal velocity. The observed threshold for inducing stationary (2,1) islands is consistent with a phenomenological resistive MHD model which takes into account plasma rotation (including poloidal flow damping) and externally applied resonant fields. Broadly similar results are found for applied fields other than m=2, n=1. Other results from RMP experiments are also discussed, such as the stabilization of rotating MHD activity, stimulated disruptions and extensions to the disruptive density limit. Finally, the likely effect of field errors on large tokamaks is briefly examined in the light of the COMPASS-C results