Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary

T. E. Evans, R. A. Moyer, P. R. Thomas, J. G. Watkins, T. H. Osborne, J. A. Boedo, E. J. Doyle, M. E. Fenstermacher, K. H. Finken, R. J. Groebner, M. Groth, J. H. Harris, R. J. La Haye, C. J. Lasnier, S. Masuzaki, N. Ohyabu, D. G. Pretty, T. L. Rhodes, H. Reimerdes, D. L. Rudakov, M. J. Schaffer, G. Wang, and L. Zeng
Phys. Rev. Lett. 92, 235003 – Published 10 June 2004

Abstract

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.

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  • Received 10 December 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.235003

©2004 American Physical Society

Authors & Affiliations

T. E. Evans1, R. A. Moyer2, P. R. Thomas3, J. G. Watkins4, T. H. Osborne1, J. A. Boedo2, E. J. Doyle9, M. E. Fenstermacher5, K. H. Finken6, R. J. Groebner1, M. Groth5, J. H. Harris7, R. J. La Haye1, C. J. Lasnier5, S. Masuzaki8, N. Ohyabu8, D. G. Pretty7, T. L. Rhodes9, H. Reimerdes10, D. L. Rudakov2, M. J. Schaffer1, G. Wang9, and L. Zeng9

  • 1General Atomics, San Diego, California, USA
  • 2University of California San Diego, La Jolla, California, USA
  • 3CEA Cadarache Euratom Association, Cadarache, France
  • 4Sandia National Laboratories, Albuquerque, New Mexico, USA
  • 5Lawrence Livermore National Laboratory, Livermore, California, USA
  • 6FZ-Jülich Euratom Association, Jülich, Germany
  • 7Australian National University, Canberra, Australia
  • 8National Institute for Fusion Science, Gifu-ken, Japan
  • 9University of California, Los Angeles, California, USA
  • 10Columbia University, New York, New York, USA

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Vol. 92, Iss. 23 — 11 June 2004

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