Collision broadened resonance localization in tokamaks excited with ICRF waves

Conference · Thu Aug 01 00:00:00 EDT 1985

OSTI ID:5307490

Kerbel, G D; McCoy, M G

Advanced wave models used to evaluate ICRH in tokamaks typically use warm plasma theory and allow inhomogeneity in one dimension. The authors have developed a bounce-averaged Fokker-Planck quasilinear computational model which evolves the population of particles on more realistic orbits. Each wave-particle resonance has its own specific interaction amplitude within any given volume element. These data need only be generated once, and appropriately stored for efficient retrieval. The wave-particle resonant interaction then serves as a mechanism by which the diffusion of particle populations can proceed among neighboring orbits. Collisions affect the absorption of rf energy by two quite distinct processes: In addition to the usual relaxation towards the Maxwellian distribution creating velocity gradients which drive quasilinear diffusion, collisions also affect the wave-particle resonance through the mechanism of gyro-phase diffusion. The local specific spectral energy absorption rate is directly calculable once the orbit geometry and populations are determined. The code is constructed in such fashion as to accommodate wave propagation models which provide the wave spectral energy density on a poloidal cross-section. Information provided by the calculation includes the local absorption properties of the medium which can then be exploited to evolve the wave field.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5307490
• Report Number(s): UCRL-92608; CONF-8509162-1; ON: DE85017829
• Resource Relation: Conference: 3. European workshop on problems in the numerical modeling of plasmas, Varenna, Italy, 10 Sep 1985
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ICR HEATING
TOKAMAK DEVICES
BOLTZMANN STATISTICS
DISTRIBUTION FUNCTIONS
FOKKER-PLANCK EQUATION
INHOMOGENEOUS PLASMA
QUASILINEAR PROBLEMS
RESONANCE
CLOSED PLASMA DEVICES
DIFFERENTIAL EQUATIONS
EQUATIONS
FUNCTIONS
HEATING
HIGH-FREQUENCY HEATING
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA
PLASMA HEATING
THERMONUCLEAR DEVICES
700101* - Fusion Energy- Plasma Research- Confinement
Heating
& Production