托卡马克等离子体微不稳定性的微扰测定
Perturbative Determination of Plasma Microinstabilities in Tokamaks
摘要：
最近，理论分析已经确定等离子体微不稳定性的主要机制，负责在托卡马克的异常热输运。特别是，微撕裂模式（MTM）已被记入与强烈的电子热通量的生产，最显着的是通过一个薄的自组织边界层称为基座。在这里，我们利用一种新的，随时间变化的分析编译明确的实验证据表明，MTM是活跃的基座区域。基座MTM的预期频率，作为从等离子体轮廓测量的时间的函数计算，示出在一个专门的实验中与观察到的磁湍流波动是非常一致的。此外，快速扰动的等离子体平衡引入解耦的不稳定性驱动和谐振位置，提供了一个令人信服的验证的分析模型。这一分析提供了强有力的证据，验证了现有的理论工作，并强调了MTMs在调节托卡马克中的电子热流的重要作用。
英文摘要：
Recently, theoretical analysis has identified plasma microinstabilities as the primary mechanism responsible for anomalous heat transport in tokamaks. In particular, the microtearing mode (MTM) has been credited with the production of intense electron heat fluxes, most notably through a thin self-organized boundary layer called the pedestal. Here we exploit a novel, time-dependent analysis to compile explicit experimental evidence that MTMs are active in the pedestal region. The expected frequency of pedestal MTMs, calculated as a function of time from plasma profile measurements, is shown in a dedicated experiment to be in excellent agreement with observed magnetic turbulence fluctuations. Further, fast perturbations of the plasma equilibrium are introduced to decouple the instability drive and resonant location, providing a compelling validation of the analytical model. This analysis offers strong evidence of edge MTMs, validating the existing theoretical work and highlighting the important role of MTMs in regulating electron heat flow in tokamaks.
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