@inproceedings{oai:repo.qst.go.jp:00074933,
 author = {Okabayashi, M. and 井上, 静雄 and Strait, E. and Taylor, Z. and C., Paz-Soldan and de Grassie, J. and Ferraro, N. and Hanson, J. and Jardin, S. and La Haye, R. and Logan, N. and Inoe, Shizuo},
 book = {Proceedings of 27th IAEA Fusion Energy Conference},
 month = {Mar},
 note = {As we reported in the IAEA 2016 [1], the application of a slowly-rotating 3D external field with the magnitude comparable to pre-existing error field can avoid tearing mode locking, achieve H-mode recovery and sustain H-mode edge while simultaneously preserving high core confinement configuration, suggesting that there a fundamental process by 3D field contributes to the MHD stability simultaneously from the core to the edge. A possible hypothesis has been proposed based on non-linear resistive reduced MHD simulations that there exists a self-healing stabilized regime with shielding out static resonant error field components by slowly-rotating 3D field [2,3]. Proof-of-principle experiments in the DIII-D device showed that the magnetic mode structure and the internal tearing mode layer radius are qualitatively consistent with the simulation predictions by taking into account of toroidicity and non-circularity. The resonant magnetic perturbation response around q=2 was minimum while the least-stable mode response was maxium around q=3 or 4 together with H-modde edge. This also supports the hypothesis. The non-linear resistive reduced MHD formulation is promising to lead the explorations of tearing mode locking avoidance by 3D external field. New observations have identidied next level of challenges for both experimental and simulation fronts.},
 title = {Critical Physical Process of Locked-Tearing Mode Control by 3D Magnetic Field Entrainment with Static Error Fields},
 year = {2019}
}