Quasi-Periodic Growth of a Single Helical Instability in a Low-Aspect Ratio RFP
Quasi-Periodic Growth of a Single Helical Instability in a Low-Aspect Ratio RFP
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DOI：
10.1585/pfr.3.029
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发表时间：
2008-05
影响因子：
0.8
通讯作者：
R. Ikezoe;T. Onchi;K. Oki;A. Sanpei;H. Himura;S. Masamune
中科院分区：
文献类型：
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作者：
R. Ikezoe;T. Onchi;K. Oki;A. Sanpei;H. Himura;S. Masamune
在RELAX的低纵横比反向场箍缩实验中观察到了单核共振不稳定性的准周期增长。在圆顶电流放电中，最内层的谐振模m = 1/n = 4随着相邻模m = 1/n = 5，6的抑制而增长。m = 1模的环形模谱类似于具有更高振幅的准单螺旋（QSH）态。这些现象进行了讨论沿着低A特性的RELAX，表明更简单的MHD模式动力学和更容易获得的QSH状态。
Quasi-periodic growth of a single core-resonant instability has been observed in a low-aspect ratio (low-A) reversed field pinch experiment in RELAX. In round-topped current discharges, the innermost core resonant m = 1/n = 4 mode grows with suppression of the neighboring m = 1/n = 5, 6 modes. The resultant toroidal mode spectrum of the m = 1 modes is similar to that of the quasi-single helicity (QSH) state with higher amplitudes. These phenomena are discussed along with the low-A characteristic of RELAX, indicating simpler MHD mode dynamics and easier access to the QSH state.