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首页> 外文期刊>Physical review letters >Nonlinear Evolution of q = 1 Triple Tearing Modes in a Tokamak Plasma
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Nonlinear Evolution of q = 1 Triple Tearing Modes in a Tokamak Plasma

机译：托卡马克等离子体中q = 1三重撕裂模的非线性演化

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摘要

In magnetic configurations with two or three q = 1 (with q being the safety factor) resonant surfaces in a tokamak plasma, resistive magnetohydrodynamic modes with poloidal mode numbers m much larger than 1 are found to be linearly unstable. It is found that these high-m double or triple tearing modes significantly enhance through nonlinear interactions the growth of the m = 1 mode. This may account for the sudden onset of the internal resistive kink, i.e., the fast sawtooth trigger. Based on the subsequent reconnection dynamics that can proceed without formation of the m = 1 islands, it is proposed that high-m triple tearing modes are a possible mechanism for precursor-free partial collapses during sawtooth oscillations.
机译：在托卡马克等离子体中具有两个或三个q = 1（q为安全系数）共振表面的磁性配置中，发现极数模数m远大于1的电阻性磁流体动力学模式是线性不稳定的。发现这些高-m双或三重撕裂模式通过非线性相互作用显着增强了m = 1模式的增长。这可以解释内部电阻扭结的突然发作，即快速的锯齿形扳机。基于可以在不形成m = 1岛的情况下进行的后续重新连接动力学，建议高m的三重撕裂模式是锯齿振荡期间无前驱体部分塌陷的可能机制。

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