Suppression of Neoclassical Tearing Modes Towards Stationary High-Beta Plasmas in JT-60U  

作　　者：A.ISAYAMA 

机构地区：[1]Japan Atomic Energy Agency,Naka,Ibaraki 311-0193,JapantheJT-60Team

出　　处：《Plasma Science and Technology》2006年第1期36-40,共5页等离子体科学和技术（英文版）

基　　金：supported in part by the JSPS-CAS Core University Program in the field of Plasma and NucIear Fusion;also supported by the Grant-in-Aid for Young Scientists(B)of MEXT Japan

摘　　要：Results from stabilization of neoclassical tearing modes （NTMs） in JT-60U are described. NTM stabilization and confinement improvement have been demonstrated by employing a real-time NTM stabilization system, where the identification of the location of an NTM and the optimization of the injection angle of the electron cyclotron wave are performed in real time. Also, a high-beta plasma with the normalized beta of 3 has been sustained by suppressing NTM by applying the electron cyclotron current drive （ECCD） before the onset （＇preemptive ECCD＇）. In addition, a simulation code for analysis of the NTM evolution has been developed by combining the modified Rutherford equation with the transport code TOPICS. It is found that the simulation well reproduces the NTM behavior in JT-60U. The simulation also shows that the ECCD width is also important for NTM stabilization, and that the EC wave power for complete stabilization can be reduced by narrowing the ECCD profile.Results from stabilization of neoclassical tearing modes （NTMs） in JT-60U are described. NTM stabilization and confinement improvement have been demonstrated by employing a real-time NTM stabilization system, where the identification of the location of an NTM and the optimization of the injection angle of the electron cyclotron wave are performed in real time. Also, a high-beta plasma with the normalized beta of 3 has been sustained by suppressing NTM by applying the electron cyclotron current drive （ECCD） before the onset （＇preemptive ECCD＇）. In addition, a simulation code for analysis of the NTM evolution has been developed by combining the modified Rutherford equation with the transport code TOPICS. It is found that the simulation well reproduces the NTM behavior in JT-60U. The simulation also shows that the ECCD width is also important for NTM stabilization, and that the EC wave power for complete stabilization can be reduced by narrowing the ECCD profile.

关 键 词：neoclassical tearing mode electron cyclotron current drive TOKAMAK 

分 类 号：O53[理学—等离子体物理] TL631.24[理学—物理]