论文信息 - Suppression of large edge-localized modes in high-confinement DIII-D plasmas with a stochastic magnetic boundary.

Suppression of large edge-localized modes in high-confinement DIII-D plasmas with a stochastic magnetic boundary.

A stochastic magnetic boundary, produced by an applied edge resonant magnetic perturbation, is used to suppress most large edge-localized modes (ELMs) in high confinement (H-mode) plasmas. The resulting H mode displays rapid, small oscillations with a bursty character modulated by a coherent 130 Hz envelope. The H mode transport barrier and core confinement are unaffected by the stochastic boundary, despite a threefold drop in the toroidal rotation. These results demonstrate that stochastic boundaries are compatible with H modes and may be attractive for ELM control in next-step fusion tokamaks.

[1] J. Rice,et al. Double transport barrier experiments on Alcator C-Mod , 2002 .

[2] G. Saibene,et al. Characteristics and scaling of energy and particle losses during Type I ELMs in JET H-modes , 2002 .

[3] W. Treutterer,et al. Type II ELMy H modes on ASDEX Upgrade with good confinement at high density , 2001 .

[4] T. Evans,et al. Modeling of stochastic magnetic flux loss from the edge of a poloidally diverted tokamak , 2002 .

[5] P. Ghendrih,et al. REVIEW ARTICLE: Theoretical and experimental investigations of stochastic boundaries in tokamaks , 1996 .

[6] G. Mindlin,et al. Simple Model of a Stochastically Excited Solar Dynamo , 2001 .

[7] J. Kurths,et al. On stochastic forces in circumplanetary dust dynamics , 2003 .

[8] P. Holmes,et al. Nonlinear Oscillations, Dynamical Systems, and Bifurcations of Vector Fields , 1983, Applied Mathematical Sciences.

[9] A. Loarte,et al. The impact of ELMs on the ITER divertor , 1998 .

[10] S. Wolfe,et al. A new look at density limits in tokamaks , 1988 .

[11] Martin Jakobi,et al. ELM frequency control by continuous small pellet injection in ASDEX upgrade , 2003 .

[12] J. A. Leuer,et al. Anomalies in the applied magnetic fields in DIII-D and their implications for the understanding of stability experiments , 2003 .

[13] B. Albright. The density and clustering of magnetic nulls in stochastic magnetic fields , 1999 .