Steady-state solution of a two-dimensional Fokker--Planck equation with strong quasilinear diffusion for lower-hybrid current drive

Journal Article · Fri Feb 01 04:00:00 EST 1985 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.865116· OSTI ID:5916442

Krapchev, V B; Hewett, D W; Bers, A

The two-dimensional Fokker--Planck equation with strong quasilinear diffusion on the tail of the electron distribution function is solved analytically and numerically. The quasilinear diffusion is taken to be parallel to the confining magnetic field of the plasma, as is appropriate for lower-hybrid current drive. The radio frequency fields that produce this quasilinear diffusion are assumed to be imposed by external sources. It is found that an appreciable broadening of the resonant plateau in the direction perpendicular to the toroidal magnetic field leads to more particles carrying the current. As a result both the current (J) and the power dissipated (P/sub d/) are substantially enhanced, compared with the predictions of one-dimensional theory. The figure of merit J/P/sub d/ is three times larger than the one found from the one-dimensional theory.

• Research Organization: Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
• DOE Contract Number: AC02-78ET51013
• OSTI ID: 5916442
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 28:2; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ANALYTICAL SOLUTION
ANNULAR SPACE
CLOSED PLASMA DEVICES
CONFIGURATION
CONFINEMENT
CURRENT-DRIVE HEATING
DIFFERENTIAL EQUATIONS
DIFFUSION
ELECTRIC HEATING
ELECTROMAGNETIC FIELDS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTRA
EQUATIONS
FOKKER-PLANCK EQUATION
HEATING
JOULE HEATING
MAGNETIC FIELDS
NUMERICAL SOLUTION
OPERATION
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA CONFINEMENT
PLASMA HEATING
RADIATIONS
RADIOWAVE RADIATION
RESISTANCE HEATING
RESONANCE
SPACE
SPECTRA
STEADY-STATE CONDITIONS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOROIDAL CONFIGURATION
TWO-DIMENSIONAL CALCULATIONS