Tokar M Z, Evans T E, Gupta A, Singh R, Kaw P, Wolf R C
Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, Association FZJ-Euratom, 52425, Jülich, Germany.
Phys Rev Lett. 2007 Mar 2;98(9):095001. doi: 10.1103/PhysRevLett.98.095001. Epub 2007 Feb 27.
Particle and energy transport in the tokamak edge transport barrier is analyzed in the presence of magnetic field perturbations from external resonant coils. In recent experiments such coils have been verified as an effective tool for mitigation of the edge-localized modes of type I. The observed reduction of the density in plasmas of low collisionality is explained by the generation of charged particle flows along perturbed field lines. The increase of the electron and ion temperatures in the barrier is interpreted by the reduction of perpendicular neoclassical transport with decreasing density and nonlocality of parallel heat transport. The found modification of the pressure gradient implies the stabilization of ballooning-peeling MHD modes responsible for type I ELMs.
在存在来自外部共振线圈的磁场扰动的情况下，对托卡马克边缘输运屏障中的粒子和能量输运进行了分析。在最近的实验中，此类线圈已被证实是缓解I型边缘局域模的有效工具。低碰撞性等离子体中观测到的密度降低，可通过沿扰动磁力线产生的带电粒子流来解释。屏障中电子和离子温度的升高，可通过随着密度降低垂直新经典输运的减少以及平行热输运的非局域性来解释。所发现的压力梯度的改变意味着对导致I型边缘局域模的气球-剥离磁流体动力学模式的稳定作用。
