On self-consistent ray-tracing and Fokker--Planck modeling of the hard x-ray emission during lower-hybrid current drive in tokamaks
- Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA, Centre d'Etudes de Cadarache, 13108 St. Paul lez Durance Cedex (France)
A detailed investigation is presented on the ability of combined ray-tracing and Fokker--Planck calculations to predict the hard x-ray (HXR) emission during lower-hybrid (LH) current drive in tokamaks when toroidally induced ray stochasticity is important. A large number of rays is used and the electron distribution function is obtained by self-consistently iterating the appropriate power deposition and Fokker--Planck calculations. It is shown that effects due to radial diffusion of suprathermal electrons and to radiation scattering by the inner wall can be significant. The experimentally observed features of the HXR emission are fairly well predicted, thus confirming that combined ray-tracing and Fokker--Planck codes are capable of correctly modeling the physics of LH current drive in tokamaks.
- OSTI ID:
- 6021940
- Journal Information:
- Physics of Fluids B; (United States), Vol. 5:9; ISSN 0899-8221
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
TOKAMAK DEVICES
FOKKER-PLANCK EQUATION
LOWER HYBRID CURRENT DRIVE
COMPUTER CODES
DISTRIBUTION FUNCTIONS
PLASMA HEATING
X-RAY EMISSION ANALYSIS
CHEMICAL ANALYSIS
CLOSED PLASMA DEVICES
DIFFERENTIAL EQUATIONS
EQUATIONS
FUNCTIONS
HEATING
NON-INDUCTIVE CURRENT DRIVE
NONDESTRUCTIVE ANALYSIS
PARTIAL DIFFERENTIAL EQUATIONS
THERMONUCLEAR DEVICES
700350* - Plasma Production
Heating
Current Drive
& Interactions- (1992-)