Suppression of vertical instability in elongated current-carrying plasmas by applying stellarator rotational transforma)
Suppression of vertical instability in elongated current-carrying plasmas by applying stellarator rotational transforma)
复制标题
通过应用仿星器旋转变换抑制细长载流等离子体中的垂直不稳定性
DOI：
10.1063/1.4878615
复制
发表时间：
2014
影响因子：
2.2
通讯作者：
P. Traverso
中科院分区：
文献类型：
--
作者：
M. C. ArchMiller;M. Cianciosa;D. Ennis;J. Hanson;G. Hartwell;J. Hebert;J. Herfindal;S. Knowlton;X. Ma;D. Maurer;M. Pandya;P. Traverso
The passive stability of vertically elongated current-carrying toroidal plasmas has been investigated in the Compact Toroidal Hybrid, a stellarator/tokamak hybrid device. In this experiment, the fractional transform f, defined as the ratio of the imposed external rotational transform from stellarator coils to the total rotational transform, was varied from 0.04 to 0.50, and the elongation κ was varied from 1.4 to 2.2. Plasmas that were vertically unstable were evidenced by motion of the plasma in the vertical direction. Vertical drifts are measured with a set of poloidal field pickup coils. A three chord horizontally viewing interferometer and a soft X-ray diode array confirmed the drifts. Plasmas with low fractional transform and high elongation are the most susceptible to vertical instability, consistent with analytic predictions that the vertical mode in elongated plasmas can be stabilized by the poloidal field of a relatively weak stellarator equilibrium.
