Theoretical studies of lower hybrid current drive and ion-cyclotron heating in tokamaks
A computational model for PLT lower hybrid current drive and ramp-up experiments combines a parallel velocity Fokker-Planck treatment of lower hybrid current drive with minor radius flux diffusion and toroidal ray-tracing wave propagation. Computational and experimental results are in good accord. Analytic solutions of the two-dimensional velocity space (v/sub perpendicular/, v/sub parallel/) diffusion problem give values of the current drive parameter J/P/sub d/ which agree with numerical results, both relativistically and nonrelativistically. Turning to ICRF heating, two new all-metal antenna designs will permit power flux up to 10 kW/cm/sup 2/. A full wave solution to the magnetosonic wave equation, based on the parabolic method, yields cylindrical convergence and treats the diffraction limitation on intensity correctly. Mode conversion with energy absorption has been added to the BALDUR ICRF modeling code. A Fokker-Planck treatment of high energy ion tail formation by ICRF finds that enhanced thermonuclear reactivity can occur.
- Research Organization:
- Princeton Univ., NJ (USA). Plasma Physics Lab.
- OSTI ID:
- 5959385
- Report Number(s):
- PPPL-2144; ON: DE85008712
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ANTENNAS
CURRENT-DRIVE HEATING
DIFFERENTIAL EQUATIONS
ELECTRIC HEATING
ELECTRICAL EQUIPMENT
EQUATIONS
EQUIPMENT
FOKKER-PLANCK EQUATION
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
JOULE HEATING
LOWER HYBRID HEATING
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA HEATING
PLT DEVICES
RESISTANCE HEATING
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
TWO-DIMENSIONAL CALCULATIONS