Numerical modeling the interaction between externally applied resonant magnetic perturbations and tearing instabilities
作者单位：State Key Laboratory of Advanced Electromagnetic Engineering and TechnologyHuazhong University of Science and Technology Max-Planck-Institut für PlasmaphysikEURATOM association85748 GarchingGermany
会议名称：《第十六届全国等离子体科学技术会议暨第一届全国等离子体医学研讨会》
会议日期：2013年
学科分类：08[工学] 082701[工学-核能科学与工程] 0827[工学-核科学与技术]
摘 要：To compare with resonant magnetic perturbations(RMPs) related experimental results observed in J-TEXT tokamak,nonlinear numerical modeling based on reduced MHD equations has been carried *** experimental parameters as input,both the mode locking and mode stabilization by RMPs are also obtained from numerical modeling. Further calculations have been carried out to study the plasma parameters affecting the mode stabilization by RMPs,including the plasma rotation frequency,viscosity,Alfven velocity and the RMP *** is found that the suppression of the tearing mode by RMPs of moderate amplitude is possible for a sufficiently high ratio of plasma rotation velocity to the Alfven speed.A larger plasma viscosity enhances the mode stabilization. In addition,the non-uniform mode rotation frequency,modulated by electromagnetic force(Fern) and viscous force(Fvs),results in the applied RMPs contributing both net stabilizing and braking effect on *** evaluation based on analytical theory shows the applied RMP contributes a dominant stabilizing effect,which are responsible for the suppression of *** dynamics of the first discovered small locked island(SLI) are *** is found that the island is locked at the stabilizing phase and the saturated island width is less than the linear layer *** simulated Mirnov signal indicates the small locked island is likely to be the complete suppression case observed in experiments. The comparisons between the numerical and experimental results are in good agreement.