Transport-driven scrape-off layer flows and the x-point dependence of the L-H power threshold in Alcator C-Mod-猫眼课题宝

DOI：

10.1063/1.1876294

发表时间：

2005-04

期刊：

Physics of Plasmas

影响因子：

2.2

通讯作者：

中科院分区：

物理与天体物理3区

文献类型：

作者：

B. LaBombard;J. Rice;A. Hubbard;J. Hughes;M. Greenwald;R. Granetz;J. Irby;Yu-Ming Lin;B. Lipschultz;E. Marmar;K. Marr;D. Mossessian;R. Parker;W. Rowan;N. Smick;J. Snipes;J. Terry;S. Wolfe;S. Wukitch

Alcator C-Mod [Phys. Plasmas 1，1511（1994）]中具有不利x点拓扑结构的低到高限制模式转变（L-H）的1.25倍的较高功率阈值与由刮除层（SOL）施加的流动边界条件相关联。类螺旋输送驱动流沿沿着磁场线从低场区流向高场区，其环形方向取决于上/下x点平衡;受限等离子体的环形旋转作出响应，当B×环B指向远离x点时，表现出强烈的逆流旋转。当B× π B指向远处时，增加辅助加热功率（rf，无动量输入）会导致L-H跃迁，跃迁速度约为边缘电子压力梯度的两倍。随着转变前梯度上升，环形旋转向并流方向倾斜;当SOL流施加的逆流旋转得到补偿时，就会出现H模式。值得注意的是，下限放电中的L-H阈值与较低的x点放电相同; SOL…

Factor of ∼2 higher power thresholds for low- to high-confinement mode transitions (L-H) with unfavorable x-point topologies in Alcator C-Mod [Phys. Plasmas 1, 1511 (1994)] are linked to flow boundary conditions imposed by the scrape-off layer (SOL). Ballooning-like transport drives flow along magnetic field lines from low- to high-field regions with toroidal direction dependent on upper/lower x-point balance; the toroidal rotation of the confined plasma responds, exhibiting a strong counter-current rotation when B×∇B points away from the x point. Increased auxiliary heating power (rf, no momentum input) leads to an L-H transition at approximately twice the edge electron pressure gradient when B×∇B points away. As gradients rise prior to the transition, toroidal rotation ramps toward the co-current direction; the H mode is seen when the counter-current rotation imposed by the SOL flow becomes compensated. Remarkably, L-H thresholds in lower-limited discharges are identical to lower x-point discharges; SOL...

Transport-driven scrape-off layer flows and the x-point dependence of the L-H power threshold in Alcator C-Mod

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