托卡马克边缘中的输运势垒与旋转Blob动力学
Transport Barrier and Spinning Blob Dynamics in the Tokamak Edge
AI总结：
本文利用含X点几何的full-f陀螺动力学PIC模拟并结合理论分析，揭示托卡马克边缘旋转blob与带状剪切层相互作用导致的稳定、捕获及输运势垒形成机制，成功解释H模径向输运低于L模。
摘要：
在本工作中，我们采用具有X点几何结构的full-f陀螺动力学粒子模拟代码，研究磁约束装置边缘等离子体blob的动力学。在模拟中，追踪一个预置blob在接近分界面附近自然形成的带状剪切层时的演化：该blob因自洽绝热电子响应诱发的强旋转而被稳定，并且在blob的跨磁场传播过程中观察到blob分岔与捕获现象。我们在无带状剪切层和带状剪切层两种情形下构建了一种新的理论解释，其中包含占主导地位的E×B旋转运动。得到了由旋转blob与带状剪切层相互作用诱发输运势垒的理论条件，并通过模拟验证了其标度关系。这一新理论框架，尤其是输运势垒，可用于解释和预测多种实验现象。特别地，采用实验参数计算的输运势垒条件表明，实验中H模的blob径向输运小于L模。
英文摘要：
In this work, we investigate the dynamics of plasma blobs in the edge of magnetic confinement devices using a full-f gyrokinetic particle-in-cell code with X-point geometry. In simulations, the evolution of a seeded blob is followed as it approaches a naturally-forming zonal shear layer near the separatrix, where the blob is stabilized by a large spin induced by the self-consistent adiabatic electron response, and blob bifurcation and trapping are observed during the cross-field propagation of blobs. A new theoretical explanation in both the zonal free and zonal shear layer is constructed, where the dominant ExB spin motion is included. A theoretical condition for a transport barrier induced by the interaction between spinning blobs and the zonal shear layer is obtained, and its scaling is verified with simulations. The new theoretical framework, especially the transport barrier, is applicable to explain and predict various experimental phenomena. In particular, the transport barrier condition calculated with experimental parameters demonstrates that the blob radial transport for H mode is smaller than L mode in experiments.
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