Effect of Ambipolar Plasma Flow on the Penetration of Resonant Magnetic Perturbations in a Quasi-axisymmetric Stellarator

Reiman, A. ; Zarnstorff, M. ; Mikkelsen, D. ; Owen, L. ; Mynick, H. ; Hudson, S. ; Monticello, D.

Princeton University. Plasma Physics Laboratory.

关键词: Velocity Magnetic Islands;    Rotating Plasmas;    Magnetic Fields;    Shielding;    70 Plasma Physics And Fusion Technology;   

DOI  :  10.2172/839129
RP-ID  :  PPPL-4064
RP-ID  :  AC02-76CH03073
RP-ID  :  839129

美国|英语

来源: UNT Digital Library

【 摘 要 】

A reference equilibrium for the U.S. National Compact Stellarator Experiment is predicted to be sufficiently close to quasi-symmetry to allow the plasma to flow in the toroidal direction with little viscous damping, yet to have sufficiently large deviations from quasi-symmetry that nonambipolarity significantly affects the physics of the shielding of resonant magnetic perturbations by plasma flow. The unperturbed velocity profile is modified by the presence of an ambipolar potential, which produces a broad velocity profile. In the presence of a resonant magnetic field perturbation, nonambipolar transport produces a radial current, and the resulting j x B force resists departures from the ambipolar velocity and enhances the shielding.