The available experimental information on runaway-driven kinetic instabilities is compared with the existing theories.

The linear growth rate of low-frequency drift instabilities is calculated numerically. The calculations also yield information on the following parameters of the unstable waves: wavelengths, frequency, and phases between the fluctuations in potential, density and temperature. On the basis of the networks of constant growth rate curves it is possible to study how stability is affected by the Debye length, the mass ratio, the temperature anistropy and the temperature gradients.

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A theoretical model of nonthermal emission of radiation at the plasma frequency in a tokamak plasma with runaway electrons is proposed. The amplitude of the radiated field resulting from the nonlinear conversion of two unstable longitudinal waves is calculated.

A scanning Fabry-Perot interferometer for use in the far ir (100 microm < < 2 mm) has been developed capable of scanning a free spectral range in a few milliseconds. A commercial loudspeaker was used as a drive, and mirrors were fabricated from electroformed copper mesh. Primary limitations of the instrument were due to vibrations of the interferometer frame.

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