Dynamics of ambipolarity

The ambipolar electric field in a tokamak with a magnetic field ripple, in the superbanana regime of collision frequency, is studied dynamically. Gauss's law, charge conservation, and a known formula from neoclassical theory reveal the relaxation of the radial electric field to its ambipolar va...

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Bibliographic Details
Published in:Physics of plasmas 2019-03, Vol.26 (3)
Main Author: Hazeltine, R. D.
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Collision dynamics
Electric fields
Magnetic fields
Magnetic induction
physics
Plasma physics
Time constant
Tokamak devices
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Summary:The ambipolar electric field in a tokamak with a magnetic field ripple, in the superbanana regime of collision frequency, is studied dynamically. Gauss's law, charge conservation, and a known formula from neoclassical theory reveal the relaxation of the radial electric field to its ambipolar value, with a time constant that is nearly independent of the magnetic field. The relaxation rate is close to the frequency of various drift instabilities.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.5091685