Tunable gyrotron develdpmlt and applications to plasma physics

In the course of developing a low-power, cw, tunable, near-millimeter wave source for spectroscopy and plasma scattering, on the University of Sydney's TORTUS tokamak (Cross et a1 1981). we have built and tested four gyrotrons. The most recent of these, GYROTRON I11 (Brand 1985, Brand and Gross 1989) and GYROTRON IV (Brand 1988) can deliver more than 10 U over the frequency range 75 to 330 GHz (wavelengths 4 to 0.9 mm).