Fusion plasma theory: Task 3, Auxiliary heating in tokamaks: Progress report, (1988--1989)

Technical Report · Sat Jul 01 00:00:00 EDT 1989

OSTI ID:5850299

Scharer, J E

The research that we have accomplished during the past year (1988--1989) includes the topics of ICRF fast wave waveguide coupling to H-mode profiles simulating CIT and full wave ICRF field solutions and a power conservation relation based on fundamental principles with JET and CIT heating applications. We have also published work on Fokker-Planck simulations of minority ion ICRF strong core electron sawteeth processes in JET, a publication on the effect of plasma edge density fluctuation and ponderomotive force effects on the coupling of ion Bernstein waves and a publication on the coupling of dielectric filled waveguides to plasmas in the ICRF. The analysis of ICRF H-mode coupling is crucial to the economic success of proposed ignition devices such as CIT and ITER. We have analyzed the coupling of ICRF waveguide launchers to H-mode density profiles modelled by a pedestal width and Gaussian edge variations with gradients comparable to current machines. We find that the launcher aperture spectrum, density gradients and width of the pedestal are important parameters in determining the coupling efficiency. The launcher-plasma admittance spectrum in k/sub y/-k/sub z/ space is utilized to show that the H-mode launcher reflections increase when compared to the L-mode profile, but that they can be handled by launcher matching circuits and modest modifications of the H-mode profile. We plan to analyze the recent successful JET ICRF H-mode operation utilizing our formalism. We have also carried out a full wave ICRF field solution and the associated power conservation relation with expressions evaluated up to the third harmonic. We have implemented this in a computer code which utilizes invariant imbedding to solve the system of equations. 7 refs., 1 tab.

• Research Organization: Wisconsin Univ., Madison, WI (USA). Dept. of Electrical and Computer Engineering
• DOE Contract Number: FG02-86ER53218
• OSTI ID: 5850299
• Report Number(s): DOE/ER/53218-11; ON: DE89017401
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
BERNSTEIN MODE
CLOSED PLASMA DEVICES
DIFFERENTIAL EQUATIONS
DOCUMENT TYPES
EQUATIONS
FOKKER-PLANCK EQUATION
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
INHOMOGENEOUS PLASMA
OSCILLATION MODES
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA
PLASMA HEATING
PROGRESS REPORT
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
WAVE PROPAGATION
WAVEGUIDES