Numerical simulation of ion cyclotron range of frequencies electron heating in the JET tokamak
An ion cyclotron range of frequencies (ICRF) full-wave code and an anisotropic quasilinear Fokker--Planck code are used to simulate the time-dependent rise in the electron and ion temperatures during a sawtooth period corresponding to initial Ohmic equilibrium conditions in the JET tokamak (in Plasma Physics and Controlled Nuclear Fusion Research, 1986 (IAEA, Vienna, 1987), Vol. 1, p. 44). Results from the 1-D power deposition studies indicate that less than 10% of the launched fast wave energy is directly absorbed by the e1ectrons via transit time damping and mode conversion processes over a wide range of the JET plasma equilibrium parameters and wave spectrum. In contrast, the Fokker--Planck results indicate a very fast time scale for the formation of energetic minority tail ions which slow down primarily on electrons. It is concluded that the process of minority ion tail formation and electron drag best explains the experimentally observed rates of electron heating as seen in JET. To further substantiate this point, numerical Fokker--Planck results are presented that yield time-dependent electron and ion temperature rises, which are in good agreement with central core experimenta1 measurements for the appropriate range of observed ICRF power density, energy confinement time, and plasma and wave parameters.
- Research Organization:
- Department of Electrical and Computer Engineering, University of Wisconsin: Madison, Madison, Wisconsin 53706
- OSTI ID:
- 6550165
- Journal Information:
- Phys Fluids B; (United States), Journal Name: Phys Fluids B; (United States) Vol. 1:1; ISSN PFBPE
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ABSORPTION
DIFFERENTIAL EQUATIONS
ECR HEATING
ELECTRON TEMPERATURE
ENERGY ABSORPTION
EQUATIONS
EQUILIBRIUM
FOKKER-PLANCK EQUATION
HEATING
HIGH-FREQUENCY HEATING
ION TEMPERATURE
JET TOKAMAK
MATHEMATICS
NUMERICAL ANALYSIS
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA
PLASMA HEATING
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS