Monte Carlo simulation of lower hybrid current drive in tokamaks

In this paper, we present a method for noninductive current drive studies based on three-dimensional simulation of test particle orbits. A Monte Carlo momentum diffusion operator is developed to model the wave-particle interaction. The scheme can be utilized in studies of current drive efficiency as...

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Bibliographic Details
Published in:IEEE transactions on plasma science 1994-06, Vol.22 (3), p.260-266
Main Authors: Sipila, S.K., Heikkinen, J.A.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350 - Plasma Production, Heating, Current Drive, & Interactions- (1992-)
CLOSED PLASMA DEVICES
Current density
Differential equations
ENERGY DEPOSITION
Exact sciences and technology
GUIDING-CENTER APPROXIMATION
LOWER HYBRID CURRENT DRIVE
Magnetic confinement and equilibrium
Magnetic flux
Monte Carlo methods
NON-INDUCTIVE CURRENT DRIVE
Nuclear physics
Orbits
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma heating (beam injection, radio-frequency and microwave, ohmic, icr, ecr and current drive heating)
Plasma production and heating
PLASMA SIMULATION
Shape
SIMULATION
Surface waves
Testing
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
Tokamaks
Toroidal magnetic fields
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Summary:In this paper, we present a method for noninductive current drive studies based on three-dimensional simulation of test particle orbits. A Monte Carlo momentum diffusion operator is developed to model the wave-particle interaction. The scheme can be utilized in studies of current drive efficiency as well as in examining the current density profiles caused by waves with a finite parallel wave number spectrum and a nonuniform power deposition profile in a toroidal configuration space of arbitrary shape. Calculations performed with a uniform power deposition profile of lower hybrid waves for axisymmetric magnetic configurations having different aspect ratios and poloidal cross-section shape confirm the semianalytic estimates for the current drive efficiency based on the solutions of the flux surface averaged Fokker-Planck equation for configurations with circular poloidal cross section. The consequences of the combined effect of radial diffusion, magnetic trapping and radially nonhomogeneous power deposition and background plasma parameter profiles are investigated.< >
ISSN:0093-3813
1939-9375
DOI:10.1109/27.297876