Investigation of Some MHD Events in the SUNIST Spherical Tokamak

• 作者: 冯春华 刘健 吴彦斌 曾龙 杨宣宗 潭熠 王文浩 王龙 解丽风 谢会乔 钟方川 高喆 高翔
• 来源期刊: 等离子体科学和技术：英文版
• 学科: 工学
• 关键词: SUNIST 球形托卡马克 事件 MHD IRES 平衡参数 进化过程 等离子体
• 年，卷（期）: 2011,（4）
• 页码范围: 420-423
• 页数: 4页
• 分类号: TN786|TL631.24
• 语种: 英文

摘要

Internal reconnection event （IRE）, which is characterized by a perturbation in plasma current Ip, loop voltage Vloop, Hα radiation and magnetic perturbation dBp, was observed in the SUNIST experiment. It is found that, the fluctuation before IREs is characterized by a structure of m= 2/n = 1, then changes to m = 4/n = 1 during the IREs; and, after IREs, the mode number changes to m = 3/n = 1. An analysis in the evolution of equilibrium parameters during IREs shows that a positive spike appears in the evolution of the plasma＇s elongation and a negative spike in the poloidal beta of plasma. A collapse in the pressure profile, corresponding to the occurrence of IREs, is also found.