Annual progress report 1985

The experimental research program has two major themes -the study of hydromagnetic waves and RF heating using the TORTUS tokamak and the development of diagnostic techniques. Some highlights during 1985 were: the completion of an experiment which shows that antennas used in Alfven wave heating should not have current elements parallel to the magnetic field and that they should be operated at frequencies well below the ion cyclotron frequency - otherwise, the antenna directly excites unwanted Alfven waves in the edge plasma; the use of the scanning submillimetre laser inteferometer to determine the radial profile of the electron density in TORTUS; and the completion of the experimental observation of laser induced fluorescence using the SUPPER II plasma