Phys. Rev. Lett. 97, 235002 (2006) [4 pages]
Evidence of Relaxation and Spontaneous Transition to a High-Confinement State in High- Steady-State Plasmas Sustained by Rotating Magnetic Fields
Abstract
References (17)
Citing Articles
Received 30 August 2006; published 6 December 2006
Evidence of relaxation has appeared, for the first time, in the extremely high- , 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
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