Spectrum and propagation of lower-hybrid waves in a tokamak plasma

Waveguide-launched lower-hybrid waves are studied using CO2 laser scattering techniques. These experiments provide the first direct experimental confirmation that the spectrum of the wavelengths inside, but near the edge of, the tokamak plasma is similar to predictions of linear theory for the launched spectrum and varies with waveguide phasing. The spectrum observed farther into the plasma is dominated by longer wavelengths and is much less dependent on phasing. An explanation of these results is presented