Submillimeter Plasma Diagnostics in Controlled Thermonuclear Fusion Research

The characteristic parameters of plasma in the tokamak, the mirror and the bumpy torus devices used in controlled thermonuclear fusion research are such that submillimeter wavelengths are required for a number of important diagnostics. These diagnostics include measurements of plasma density, electron cyclotron radiation levels, ion temperature, and impurity-concentration. It may also be possible to use sub-millimeter radiation to measure transverse thermal conductivity in a tokamak plasma by local heating and to determine the poloidal magnetic field by cyclotron absorption and measurements.