First measurements of line electron density in Uragan-2M plasmas via 140 GHz heterodyne interferometer

摘要

Commissioned a microwave 2 mm (140 GHz) superheterodyne interferometer, which allows to start the measurement of linear (average over the length of the chord passing through the plasma) of the electron density at the Uragan-2M torsatron. Compared with the previously used 8 mm interferometer, this diagnosis will significantly expand the limits of measurement. It is now possible to measure the plasma density up to the 2.43∙10²⁰ m⁻³. New receiving and transmitting waveguide line provided a significant reduction in attenuation of the microwave radiation introduced into the plasma. It ensures that the value of the minimum measured density does not exceed 1.5∙10¹⁶ m⁻³. It is shown that a high signal-to-noise ratio and the temporal efficiency of the detection system allowed to measure the quasi-coherent plasma fluctuations in the range of 3…20 kHz.