Study on Stabilization of Vertical Position of Tokamak Plasma with Local Helical Coils in TOKASTAR-2
Study on Stabilization of Vertical Position of Tokamak Plasma with Local Helical Coils in TOKASTAR-2
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TOKASTAR-2中局部螺旋线圈稳定托卡马克等离子体垂直位置的研究
DOI：
10.1585/pfr.15.1402083
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发表时间：
2020
影响因子：
0.8
通讯作者：
K. Kado
中科院分区：
文献类型：
--
作者：
K. Yasuda;T. Fujita;A. Okamoto;H. Arimoto;R. Ikeda;S. Kimata;K. Kado
为了抑制TOKASTAR-2中的垂直位移事件，我们研究了等离子体垂直位置上的局域螺旋磁场效应(fffi)。在有无螺旋fi场的情况下，研究了垂直等离子体位置和延长等离子体的线圈电流对VDE发生的条件，没有观察到明显的螺旋fi场效应。即使增大了螺旋线圈的电流，调整了等离子体的垂直位置，现有的局部螺旋线圈也不能有效地稳定等离子体的垂直位置，从而导致等离子体电流猝灭。我们利用磁ff线迹计算，评价了预期能稳定等离子体垂直位置的有效径向fi磁场。我们发现，现有螺旋线圈产生的有效径向ff场的分布和大小不适合稳定等离子体的垂直位置。我们设计了新的局部螺旋线圈，由位于等离子体上下两侧的三角形线圈组成。这种新型线圈可以产生有效的径向磁场(ffRadialfield)，有望稳定等离子体垂直位置。
We investigated e ff ects of the local helical magnetic field on the plasma vertical position to suppress Vertical Displacement Event (VDE) in TOKASTAR-2. Conditions for VDE occurrence were investigated on the vertical plasma position and the current of coils for elongating the plasma, with and without the helical field, and no clear e ff ects of the helical field were observed. Even though the helical coil currents were increased and the plasma vertical position were adjusted, the existing local helical coils were not e ff ective to stabilize the plasma vertical position, resulting in the plasma current quench. We evaluated the e ff ective radial field, which is expected to stabilize the plasma vertical position, using magnetic field line trace calculation. We found that the distribution and magnitude of the e ff ective radial field generated by the existing helical coils were not appropriate for stabilization of the plasma vertical position. We designed new local helical coils consisting of triangular coils located on the upper and lower sides of the plasma. The new coils can generate the e ff ective radial magnetic field, which is expected to stabilize the plasma vertical position.