Experimental studies of thermal and non-thermal electron cyclotron phenomena in tokamaks

Technical Report · Sat Dec 01 04:00:00 EST 1984

OSTI ID:5558087

McDermott, F S

A direct measurement of wave absorption in the ISX-B tokamak at the second harmonic of the electron cyclotron frequency is reported. Measurements of the absorption of a wave polarized in the extraordinary mode and propagating perpendicular to the toroidal magnetic field are in agreement with the absorption predicted by the linearized Vlasov equation for a thermal plasma. Agreement is found both for an analytic approximation to the wave absorption and for a numerical simulation of ray propagation in toroidal geometry. Observations are also reported on a non-linear, three-wave interaction process occurring during high power electron cyclotron resonance heating in the Versator II tokamak. The measured spectra and the threshold power are consistent with a model in which the incident power in the extraordinary mode of polarization decays at the upper hybrid resonance layer into a lower hybrid wave and an electron Bernstein wave. Finally, measurements of non-thermal emission at the second harmonic of the electron cyclotron frequency and below the electron plasma frequency are reported from low density, non-Maxwellian plasma in the Versator II tokamak. The emission spectra are in agreement with a model in which waves are driven unstable at the anomalous Doppler resonance, while only weakly damped at the Cerenkov resonance.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Plasma Fusion Center
• DOE Contract Number: AC02-78ET51013
• OSTI ID: 5558087
• Report Number(s): DOE/ET/51013-140; PFC/RR-84-20; ON: DE85013650
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ABSORPTION
BERNSTEIN MODE
BOLTZMANN-VLASOV EQUATION
BREMSSTRAHLUNG
CLOSED PLASMA DEVICES
CYCLOTRON RADIATION
DIFFERENTIAL EQUATIONS
ECR HEATING
ELECTROMAGNETIC RADIATION
ENERGY TRANSFER
EQUATIONS
HARMONICS
HEATING
HIGH-FREQUENCY HEATING
HYBRID RESONANCE
ISX TOKAMAK
NONLINEAR PROBLEMS
OSCILLATION MODES
OSCILLATIONS
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA HEATING
RADIATIONS
RESONANCE
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
TOKAMAK DEVICES
TOKAMAK TYPE REACTORS