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Phys. Rev. Lett. 97, 235002 (2006) [4 pages]

Evidence of Relaxation and Spontaneous Transition to a High-Confinement State in High-beta Steady-State Plasmas Sustained by Rotating Magnetic Fields

H. Y. Guo, A. L. Hoffman, L. C. Steinhauer, K. E. Miller, and R. D. Milroy
Redmond Plasma Physics Laboratory, University of Washington, Seattle, Washington 98195, USA
Received 30 August 2006; published 6 December 2006

Evidence of relaxation has appeared, for the first time, in the extremely high-beta, steady-state field-reversed configuration plasma states driven by rotating magnetic fields (RMF) in the translation, confinement, and sustainment experiment. The plasma self-organizes into a near-force-free state in the vicinity of the magnetic axis, with significant improvement in confinement. Associated with this change in magnetic topology is the appearance of an axial RMF component; this would, in turn, generate a current drive in the poloidal direction, thus sustaining the magnetic helicity. A newly developed two-dimensional “equilibrium-lite” model is employed to analyze the magnetic properties of the final high-confinement state, and shows a large q and a significant magnetic shear in the core.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.97.235002
DOI: 10.1103/PhysRevLett.97.235002
PACS: 52.55.Lf; 52.35.Py; 52.55.Dy; 52.55.Wq
  • 52.55.Lf
    Field-reversed configurations, rotamaks, Astrons, ion rings, magnetized target fusion, and cusps
  • 52.35.Py
    Plasma macroinstabilities (hydromagnetic) e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor instabilities, etc
  • 52.55.Dy
    General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc
  • 52.55.Wq
    Current drive; helicity injection in magnetic plasma confinement
  • YEAR: 2006

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