R. Schubert, F. Braun, J. Gernhardt, F. Hofmeister, F. Leuterer, M. Münich, J.-M. Noterdaeme, F. Wesner, Controlled Fusion and Plasma Physics, Amsterdam, 1990; pp. 1552-1555
RF heating methods need special diagnostics to help better understand the interaction of the wave with the plasma. Of particular interest is the influence of the wave on the edge plasma in the direct vicinity of the RF heating antenna. One important parameter in this context is the electron density, which can be measured by means of microwave reflectometry. In this paper we describe a fast X-mode reflectometer installed on ASDEX. We present measurements of the edge density profile in the range 1011 cm-3 < ne < 1.5 *1013 cm-3.
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