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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Veröffentlicht in:	Physical review letters 2006-06, Vol.96 (22), p.225002-225002, Article 225002
Hauptverfasser:	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:	Artikel
Sprache:	eng
Schlagworte:	AMPLIFICATION ANGULAR MOMENTUM CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS DRAG MAGNETIC FIELDS NEOCLASSICAL TRANSPORT THEORY PLASMA TORQUE VISCOSITY
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Beschreibung
Zusammenfassung:	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