Intrinsic rotation driven by turbulent acceleration
Intrinsic rotation driven by turbulent acceleration
复制标题
湍流加速驱动的固有旋转
DOI:
10.1088/1361-6587/aaeb69
复制
发表时间:
2019
影响因子:
2.2
通讯作者:
Barnes M
中科院分区:
文献类型:
--
作者:
Barnes M
Differential rotation is induced in tokamak plasmas when an underlying symmetry of the governing gyrokinetic-Maxwell system of equations is broken. One such symmetry-breaking mechanism is considered here: the turbulent acceleration of particles along the mean magnetic field. This effect, often referred to as the'parallel nonlinearity', has been implemented in the δf gyrokinetic code stella and used to study the dependence of turbulent momentum transport on the plasma size and on the strength of the turbulence drive. For JET-like parameters with a wide range of driving temperature gradients, the momentum transport induced by the inclusion of turbulent acceleration is similar to or smaller than the ratio of the ion Larmor radius to the plasma minor radius. This low level of momentum transport is explained by demonstrating an additional symmetry that prohibits momentum transport when the turbulence is driven far above marginal stability.
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