ELECTRON-CYCLOTRON EMISSION CORRELATION RADIOMETRY IN TOROIDAL PLASMA-CONFINEMENT DEVICES

Very low level plasma density and temperature fluctuations can be resp onsible for anomalous transport in thermonuclear magnetic traps. Elect ron cyclotron emission (ECE) detection has proven to be a very effecti ve diagnostic for monitoring plasma temperature fluctuations at the fr equencies of interest. Diffraction unfortunately limits the space reso lution of this diagnostic with potentially important consequences on e stimates of turbulent transport. This issue will be investigated both theoretically and with regard to technical implications. Experimental results obtained on the TEXT-U tokamak will be used to illustrate the previous point. Recent results obtained on TEXT-U with ECE, and corrob orated by other fluctuation diagnostics, on the anisotropy of the high frequency fluctuations will be presented. (C) 1997 Elsevier Science S .A.