Dynamics of axisymmetric E x B and poloidal flows in tokamaks
Dynamics of axisymmetric E x B and poloidal flows in tokamaks
复制标题
托卡马克中轴对称 E x B 和极向流的动力学
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
M. Rosenbluth
中科院分区：
文献类型：
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作者：
F. Hinton;M. Rosenbluth
由于湍流和有限拉莫尔半径效应，托克马克等离子体中存在随机径向电流，这些电流驱动剪切轴对称极向流。作者模拟这些电流与噪声源与给定的统计特性，并计算线性动力学响应这个源。没有碰撞，这些流动就没有长期阻尼;当包括碰撞时，极向流动被阻尼。与这些流量相关的均方电位是根据它们计算的线性响应函数和电流源的模型相关函数给出的。在没有碰撞的情况下，均方E {times} B流量随时间线性增加，但在有碰撞的情况下，它达到稳定状态。在较长的相关时限内，无碰撞剩余流对确定均方E {times} B流是很重要的。
As a result of turbulence and finite Larmor radius effects, random radial currents are present in a tokamak plasma, and these drive sheared axisymmetric poloidal flows. The authors model these currents with a noise source with given statistical properties and calculate the linear kinetic response to this source. Without collisions, there is no long term damping of these flows; when collisions are included, poloidal flows are damped. The mean square potential associated with these flows is given in terms of the linear response function they calculate and a model correlation function for the current source. Without collisions, the mean square E {times} B flow increases linearly with time, but with collisions, it reaches a steady state. In the long correlation time limit, the collisionless residual flows are important in determining the mean square E {times} B flow.