Scattering damping of LH fast waves by density fluctuations in CCT

Conference · Sat Jul 01 04:00:00 EDT 1989 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:6508934

Lai, K F; Fried, B D; Taylor, R J ^[1]

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1. University of California, Los Angeles, CA (USA)

Anomalous damping of the LH fast waves has been observed in the UCLA CCT tokamak over a wide range of frequencies and magnetic fields during high power fast wave current drive experiments. In order to identify the wave damping mechanisms, insertible magnetic dipole antennas have been used to launch test waves locally. The damping coefficients of these waves have been determined using detailed poloidal field maps at various distances from the antennas. Lorentzian shaped sidebands have been excited strongly near the fundamental and harmonics of the driver frequencies and correlated very well with the local density fluctuation spectra. The anomalous damping of the fast waves can be attributed to the wave scattering by density fluctuations. The experimental results show good agreement with an approximate wave scattering theory developed by S.N. Antani and D.J. Kaup. Generalization of the scattering theory to a full-wave calculation will be presented.

• OSTI ID: 6508934
• Report Number(s): CONF-8905120--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Journal Volume: 190:1
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ANNULAR SPACE
ATTENUATION
CLOSED CONFIGURATIONS
CLOSED PLASMA DEVICES
CONFIGURATION
DAMPING
ELECTRON DENSITY
HEATING
HIGH-FREQUENCY HEATING
LOWER HYBRID HEATING
MAGNETIC FIELD CONFIGURATIONS
MICROWAVE SPECTRA
PLASMA HEATING
SPACE
SPECTRA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOROIDAL CONFIGURATION
WAVE PROPAGATION