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Characterization of Quasi-Single-Helicity States in a Low-Aspect-Ratio RFP

机译：低长宽比RFP中准单螺旋状态的表征

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Characteristics of quasi-single-helicity (QSH) states have been studied in a low-aspect-ratio reversed field pinch (RFP) machine RELAX mainly by magnetic diagnostics. Internal profiles of the fluctuating radial, poloidal and toroidal magnetic fields have shown good agreement with eigenfunctions of a single helical mode. The edge magnetic fluctuation spectra are somewhat broader than what are expected from internal magnetic field profiles. In spite of these slight discrepancies, the usual measure for the QSH, the spectral index N S lower than 2, still provides a reasonable measure for QSH states in RELAX. The QSH persistence has been improved in RELAX by the reduction of the poloidal resistance of flanges at poloidal gaps, mainly due to the improved axisymmetry of the toroidal magnetic field. QSH persistence more than 30% of the flat-topped current phase has been realized with current density lower than in other RFP, and probability of spontaneous QSH is 12.8 ± 7.3% which is higher than high-aspect-ratio RFP. It suggests the advantage of low-aspect-ratio configuration in attaining to the QSH. Comparison with recent experiments using active resonant perturbation may suggest the importance of further reduction of field errors to improve the quality of QSH.
机译：主要通过磁诊断技术在低纵横比反向场收缩（RFP）机器RELAX中研究了准单螺旋（QSH）状态的特性。波动的径向，多极和环形磁场的内部轮廓与单螺旋模式的本征函数显示出良好的一致性。边缘磁场波动谱比内部磁场分布所期望的谱要宽一些。尽管存在这些细微的差异，但通常对QSH的度量（光谱指数N S 小于2）仍然为RELAX中的QSH状态提供了合理的度量。 RELAX的QSH持久性已通过减小法兰在极向间隙处的极向阻力而得到改善，这主要是由于环形磁场的轴对称性得到了改善。实现了QSH持久性超过平顶电流相位的30％，并且电流密度低于其他RFP，并且自发QSH的概率为12.8±7.3％，高于高纵横比RFP。这表明低纵横比配置在获得QSH方面的优势。与使用主动谐振微扰的最新实验进行比较可能表明，进一步减小场误差对提高QSH质量的重要性。

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