Spontaneous toroidal rotation driven by the off-diagonal term of momentum and heat transport in the plasma with the ion internal transport barrier in LHD
Spontaneous toroidal rotation driven by the off-diagonal term of momentum and heat transport in the plasma with the ion internal transport barrier in LHD
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DOI：
10.1088/0029-5515/50/6/064007
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发表时间：
2010-06-01
期刊：
影响因子：
3.3
通讯作者：
Kaneko, O.
中科院分区：
文献类型：
--
作者：
Ida, K.;Yoshinuma, M.;Kaneko, O.
在具有离子内部传输势垒（ITB）的等离子体中观察到同向的自发旋转，其中在LHD中离子温度梯度相对较大（偏导数Ti/偏导数r类似于5 keVm（-1），R/LTi类似于10）。由于大的离子温度梯度，自发的环形流，V-phi（spon）的幅度，变得足够大，以取消由切向注入中性束驱动的环形流和净环形旋转速度几乎为零，在外半部分的等离子体小半径，即使在等离子体与反主导NB注射。由于旋转速度为零，即使存在速度箍缩效应，也被排除在外。自发的环形流动出现在共旋方向上，在ITB形成之后，而不是在ITB形成期间或之前。在该实验中观察到的V-phi（spon）和偏导数T-i/偏导数r的变化之间的因果关系清楚地表明，自发旋转由作为动量和热传输的非对角项的离子温度梯度驱动。
A spontaneous rotation in the co-direction is observed in plasmas with an ion internal transport barrier (ITB), where the ion temperature gradient is relatively large (partial derivative T-i/partial derivative r similar to 5 keVm(-1) and R/LTi similar to 10) in LHD. Because of the large ion temperature gradients, the magnitude of the spontaneous toroidal flow, V-phi(spon), becomes large enough to cancel the toroidal flows driven by tangential injected neutral beams and the net toroidal rotation velocity is almost zero at the outer half of the plasma minor radius even in the plasmas with counter-dominant NB injections. The effect of velocity pinch is excluded even if it exits because of zero rotation velocity. The spontaneous toroidal flow appears in the direction of co-rotation after the formation of the ITB, not during or before the ITB formation. The causality between the change in V-phi(spon) and partial derivative T-i/partial derivative r observed in this experiment clearly shows that the spontaneous rotation is driven by the ion temperature gradient as the off-diagonal terms of momentum and heat transport.