Toroidal momentum confinement in neoclassical quasilinear theory in tokamaks

Journal Article · Mon Jan 01 04:00:00 UTC 2001 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.1332986· OSTI ID:40205975

Shaing, K C

The neoclassical quasilinear theory is employed to study the toroidal momentum confinement in tokamaks. The electrostatic fluctuation-induced toroidal stress is calculated. It is found that besides the conventional diffusion term, there is also a convective term in the toroidal momentum equation. In the case of a weak toroidal momentum source, the logarithmic gradient of the toroidal flow is proportional to the linear combination of the logarithmic gradients of the plasma pressure and the temperature. This conclusion is insensitive to both the renormalization procedure and the magnitude of the fluctuations. The theory is applied to explain the changing of the toroidal flow direction after low mode (L-mode) to high mode (H-mode) transition observed in some experiments.

• Sponsoring Organization: (US)
• OSTI ID: 40205975
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 8; ISSN 1070-664X
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONFINEMENT
DIFFUSION
ELECTROSTATICS
FLUCTUATIONS
PHYSICS
PLASMA PRESSURE
RENORMALIZATION