【摘要】 离子玻恩斯坦波调制实验在HT—7超导托卡马克装置上完成了。在实验中观察到了约束改善的现象。在离子玻恩斯坦波调制时,用朗谬探针阵列研究了HT—7托卡马克刮削层的涨落和输运。在离子玻恩斯坦波调制时,密度涨落被明显抑制,同时由静电涨落引起的向外的粒子通量和热通量减少到零。刮削层中的极向扰动传播方向改变了。即在欧姆放电时,极向扰动传播方向是离子逆磁方向 在有离子玻恩斯坦波时,极向扰动传播似乎停止,产生了负的径向电场。杂质辐射被离子玻恩斯坦波调制阻止。大的MHD能能被离子玻恩斯坦波调制所抑制。由撕裂模引起的大破裂能够被延迟或被避免。重复多次的IBW脉冲可以进行扰动的解相关和约束改善的机理研究。更多还原

【Abstract】 The experiment with Ion Berstein Wave modulating (IBWM) was carried out in HT—7 Superconducting Tokamak, in which an improved confinement phase was observed. The fluctuation and transport in the SOL of HT—7 Tokamak have been investigated using a Langmuir probe array with IBW modulation. During the IBW Pulses, the density fluctuation is suppressed markedly in the whole frequency domain and the local outward particle flux and heat flux induced by electrostatic fluctuation decrease to almost zero. The direction of turbulence poloidal propagation changes in SOL. In Ohmic phase turbulence propagates in the ion diamagnetic drift direction, but in IBW phase turbulence seems to stop rotation in the poloidal direction, equivalent to an additional negative radial electric field produced by IBW Pulses. The impurity radiation can be interrupted by modulated IBW. The large MHD m = 2 tearing modes were suppressed by IBWM. The disruption, which was induced by tearing mode instability was delayed or avoided. The repeated application of IBW pulses is found to be an underlying mechanism to explain the observed de-correlation of turbulence and improved confinement.更多还原