Investigation of Some MHD Events in the SUNIST Spherical Tokamak  

作　　者：曾龙 高喆 谭熠 王文浩 谢会乔 解丽风 冯春华 刘健 王龙 杨宣宗 吴彦斌 钟方川 高翔 

机构地区：[1]Department of Engineering Physics,Tsinghua University [2]Institute of Plasma Physics,Chinese Academy of Sciences [3]Institute of Physics,Chinese Academic of Sciences [4]College of Physics,Donghua University

出　　处：《Plasma Science and Technology》2011年第4期420-423,共4页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.10405014,10990214);MOST of China(Nos.2009GB105002 and 2008GB717804);in part by the JSPS-CAS Core-University program in the field of 'Plasma and Nuclear Fusion'

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.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.

关 键 词：IRES SUNIST singular value decomposition poloidal mode 

分 类 号：TL631.24[核科学技术—核技术及应用]