Resistive wall stabilization of high-beta plasmas in DIII-D

E. J. Strait, J. Bialek, N. Bogatu, M. Chance, M. S. Chu, D. Edgell, A. M. Garofalo, G. L. Jackson, T. H. Jensen, L. C. Johnson, J. S. Kim, R. J. La Haye, G. Navratil, M. Okabayashi, H. Reimerdes, J. T. Scoville, A. D. Turnbull, M. L. Walker

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)

Abstract

Recent DIII-D experiments show that ideal kink-modes can be stabilized at high beta by a resistive wall, with sufficient plasma rotation. However, the resonant response to static magnetic field asymmetries by a marginally stable resistive wall mode can lead to strong damping of the rotation. Careful reduction of such asymmetries has allowed plasmas with beta well above the ideal MHD no-wall limit, and approaching the ideal-wall limit, to be sustained for durations exceeding 1 s. Feedback control can improve plasma stability by direct stabilization of the resistive wall mode or by reducing magnetic field asymmetry. Assisted by plasma rotation, direct feedback control of resistive wall modes with growth rates more than five times faster than the characteristic wall time has been observed. These results open a new regime of tokamak operation above the free-boundary stability limit, accessible by a combination of plasma rotation and feedback control.

Original languageEnglish
Pages (from-to)430-440
Number of pages11
JournalNuclear Fusion
Volume43
Issue number6
DOIs
Publication statusPublished - 2003 Jun

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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