Observation of plasma toroidal-momentum dissipation by neoclassical toroidal viscosity

Dissipation of plasma toroidal angular momentum is observed in the National Spherical Torus Experiment due to applied nonaxisymmetric magnetic fields and their plasma-induced increase by resonant field amplification and resistive wall mode destabilization. The measured decrease of the plasma toroida...

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Bibliographic Details
Published in:Physical review letters 2006-06, Vol.96 (22), p.225002-225002, Article 225002
Main Authors: Zhu, W, Sabbagh, S A, Bell, R E, Bialek, J M, Bell, M G, LeBlanc, B P, Kaye, S M, Levinton, F M, Menard, J E, Shaing, K C, Sontag, A C, Yuh, H
Format: Article
Language:English
Subjects:
AMPLIFICATION
ANGULAR MOMENTUM
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DRAG
MAGNETIC FIELDS
NEOCLASSICAL TRANSPORT THEORY
PLASMA
TORQUE
VISCOSITY
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Summary:Dissipation of plasma toroidal angular momentum is observed in the National Spherical Torus Experiment due to applied nonaxisymmetric magnetic fields and their plasma-induced increase by resonant field amplification and resistive wall mode destabilization. The measured decrease of the plasma toroidal angular momentum profile is compared to calculations of nonresonant drag torque based on the theory of neoclassical toroidal viscosity. Quantitative agreement between experiment and theory is found when the effect of toroidally trapped particles is included.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.96.225002