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仿星器线圈的构形形变在制造和装配过程中是不可避免的, 这些形变会导致误差场的产生, 仿星器的磁场位形对误差场非常敏感, 严重制约等离子体的约束性能. 因此, 评估线圈形变对仿星器磁拓扑结构的影响是非常重要的研究课题. 本文研究了中国首台准环对称仿星器(CFQS)上非平面模块化线圈(MC)形变对真空场下磁拓扑结构的影响. 利用磁岛宽度变化来衡量线圈形变造成的误差场, 采用3种旋转变换(ι = 2/4, 2/5和2/6)的磁岛位形, 分别考虑了每个模块化线圈的面内扰动和面外扰动. 结果表明, 同一线圈的形变会产生不同的共振误差场, 且这些误差场的幅度各不相同; 共振误差场对每个线圈形变的敏感度不同, 最复杂线圈的面内扰动可能对磁拓扑结构的影响并不明显; 共振误差场对线圈面外扰动的灵敏度高于面内扰动的灵敏度.In stellarators, error fields arise from the inevitable deviations in the fabrication and assembly of complex coil systems. The magnetic configurations of stellarators are predominantly generated by external coils and are highly sensitive to these error fields. Therefore, assessing the impact of coil deformations on stellarator magnetic topology is important. The purpose of this study is to explore the influence of error fields, caused by modular coil (MC) perturbations, on the magnetic topology of the Chinese First Quasi-axisymmetric Stellarator (CFQS). In this work, by changing the Fourier coefficients that represent the current-carrying surface (CCS) and the coil, two types of deformation coils, i.e. “in-surface” and “out-of-surface” disturbance on each MC can be obtained. Subsequently, three kinds of magnetic islands (ι = 2/4, 2/5 and 2/6) are used to identify coil deviations that have a significant influence on the CFQS magnetic configuration. Several important results are obtained as follows. i) The same deformation of a coil gives rise to various resonant error fields with different amplitudes. ii) The sensitivity of a resonant error field to the deformation of each coil is different. The in-surface disturbance of the most complex coil may not have a significant influence on the magnetic topology structure. iii) The sensitivity of the resonant error field to out-of-surface disturbance in the coil is higher than that to in-surface disturbance.
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Keywords:
- quasi-axisymmetric stellarator /
- coil deformations /
- error fields /
- magnetic configuration
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] -
磁岛位形(n/m) 2/4 2/5 2/6 线
圈
电
流IMC/kA MC1 312.5 312.5 406.3 MC2 312.5 312.5 281.6 MC3 312.5 312.5 281.6 MC4 312.5 312.5 281.6 ITFC/kA TFC_10 –60 –24 0 TFC_32 –90 –36 0 TFC_70 –90 –36 0 IPFC/kA PFC_OV 0 0 –82 PFC_IV 0 0 41 
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