Transport of parallel momentum induced by current-symmetry breaking in toroidal plasmas.
Transport of parallel momentum induced by current-symmetry breaking in toroidal plasmas.
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DOI：
10.1103/physrevlett.102.125001
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发表时间：
2009-03
影响因子：
8.6
通讯作者：
Y. Camenen;A. Peeters;C. Angioni;F. Casson;W. Hornsby;A. Snodin;D. Strintzi
中科院分区：
文献类型：
--
作者：
Y. Camenen;A. Peeters;C. Angioni;F. Casson;W. Hornsby;A. Snodin;D. Strintzi
物理系统的对称性对其性质有很大的影响。在环形等离子体中，在没有背景流的情况下，沿沿着磁场线的对称性通常将平行动量的径向通量约束为零。通过打破环形电流的上下对称性，可以放松这种约束。在磁配置的平行不对称，然后导致一个不完整的取消的湍流动量通过通量表面。随后的环向旋转的幅度增加的上下不对称性和其符号取决于方向的环向磁场和等离子体电流。这种机制为当今实验中内在环向旋转的解释和控制提供了新的见解。
The symmetry of a physical system strongly impacts on its properties. In toroidal plasmas, the symmetry along a magnetic field line usually constrains the radial flux of parallel momentum to zero in the absence of background flows. By breaking the up-down symmetry of the toroidal currents, this constraint can be relaxed. The parallel asymmetry in the magnetic configuration then leads to an incomplete cancellation of the turbulent momentum flux across a flux surface. The magnitude of the subsequent toroidal rotation increases with the up-down asymmetry and its sign depends on the direction of the toroidal magnetic field and plasma current. Such a mechanism offers new insights in the interpretation and control of the intrinsic toroidal rotation in present day experiments.