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Spontaneous core toroidal rotation in Alcator C-Mod L-mode, H-mode and ITB plasmas

机译:Alcator C-Mod L模式,H模式和ITB等离子体中的自发环形旋转

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摘要

Spontaneous toroidal rotation, self-generated in the absence of an external momentum input, exhibits a rich phenomenology. In L-mode plasmas, the rotation varies in a complicated fashion with electron density, magnetic configuration and plasma current and is predominantly in the counter-current direction. The rotation depends sensitively on the balance between the upper and lower null and plays a crucial role in the H-mode power threshold. Rotation inversion between the counter-and co-current directions has been observed following small changes in the electron density and plasma current, with very distinct thresholds. In contrast, the intrinsic rotation in H-mode plasmas has a relatively simple parameter dependence, with the rotation velocity proportional to the plasma stored energy normalized to the plasma current, and is nearly always directed co-current. In plasmas with internal transport barriers, formed either with off-axis ICRF heating or LHCD, the core rotation velocity increments in the counter-current direction as the barrier evolves.
机译:在没有外部动量输入的情况下自发产生的自发环形旋转具有丰富的现象学。在L型等离子体中,旋转会随着电子密度,磁性结构和等离子体电流而以复杂的方式变化,并且主要沿逆流方向变化。旋转敏感地取决于上下零位之间的平衡,并且在H模式功率阈值中起关键作用。在电子密度和等离子体电流的微小变化下,在非常不同的阈值下,已经观察到逆流和顺流方向之间的旋转反转。相反,H模式等离子体中的固有旋转具有相对简单的参数依赖性,其旋转速度与等离子体存储的能量成正比,且归一化为等离子体电流,并且几乎总是定向并流。在带有内部传输势垒的等离子体中,通过离轴ICRF加热或LHCD形成,随着势垒的发展,核心旋转速度沿逆流方向增加。

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