Abstract

A 30-GHz Lecher wire interferometer of high sensitivity and spatial resolution is used for the detection of ion acoustic test waves in a magnetized plasma. Coherent density fluctuations of 0.1% for electron densities of 1010 cm−3 can be detected by means of a phase-lock technique. The spatial resolution (minimum measurable wavelength) is given by the 1.5-mm spacing of the Lecher wires, which is large compared to the Debye length.

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