摘要
介绍了在HT 6M托卡马克上 ,利用双低杂波的组合 ,成功地实现了准稳态的高约束模式运行 .能量约束时间提高两倍以上 ,粒子的约束在较高密度下依然改善 3倍以上 .通过应用波扩散及电流径向扩散方程计算低杂波电流传播的方法 ,对一组典型的数据进行数值模拟 .计算表明 ,在HT 6M低杂波实验中 ,由于纵场较低 ,密度较高 ,低杂波的能量沉积在离磁轴较远的位置 ,使等离子体电流密度分布成为反剪切位形 ,内部输运垒地形成 ,大大提高了等离子体的约束状况 .实验数据也给出了反剪切的证据 .
Quasi\|steady\|state H\|mode has been achieved by combination of two lower hybrid waves in HT\|6M tokamak.Plasma energy confinement time increases by two times,and the particle confinement time increases by a factor of three under a high plasma density condition.The wave diffusion and current radial diffusion code is used to simulate the experimental data on HT\|6M.The calculated results show that the off\|axis power deposition of lower hybrid wave is formed due to the low toroidal magnetic field and high plasma density.Reversed sheared(RS) configuration of the plasma current density is formed during H\|mode phase.The RS configuration and internal transport barrier are attributed to the enhanced confinement improvement.The experimental data also gives the evidence for the reversed shear formation.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第12期2414-2419,共6页
Acta Physica Sinica
基金
国家自然科学基金!(批准号 :19885 0 0 5 )资助的课题&&
关键词
托卡马克
低杂波
约束改善
实验
tokamak, lower hybrid wave, confinement improvement
