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High Spatial Resolution Temperature Measurements in the JET Plasma Using Electron Cyclotron Emission
by Neil Anthony Salmon
A thesis submitted for the degree of Doctor of Philosophy in the University of London
JET Joint Undertaking Abingdon Oxfordshire OX14 SEA Department of Plasma Physics The Blackett Laboratory Imperial College of Science, Technology and Medicine South Kensington London SW7 2BZ 1
November 1989
Abstract The development and application of a high spatial resolution electron temperature diagnostic for the JET plasma is described. The technique chosen uses a microwave heterodyne radiometer to make spectrally resolved measurements of the electron cyclotron emission (ECE). Measurements made by this system in the plasma edge region and around the rational magnetic flux surfaces are presented and their significance discussed. ECE is a powerful diagnostic tool for the measurement of electron temperature in tokamak plasmas. However, its potential for high spatial resolution measurements in the main plasma and as a diagnostic for the edge region has not previously been exploited. The edge region is of importance for the understanding of boundary phenomena but is difficult to diagnose using other techniques. An investigation of the physics of the electron cyclotron emission reveals the potential spatial resolution in JET to be a few percent of the minor radius. Furthermore, it is shown that such measurements are possible within -0.1 m of the plasma edge. To exploit this potential, a heterodyne radiometer with a fixed frequency local oscillator and a wide intermediate frequency (IF) bandwidth was designed and constructed. This instrument uses an array of multiple narrow-band filters in the IF section to provide temperature measurements at eight different spatial locations simultaneously over a -0.25 m region of plasma. Temperature measurements with a signal-to-noise ratio of >50:1 are achieved in a signal bandwidth of
