Multichannel microwave interferometer with an antenna switching system for electron density measurement in a laboratory plasma experiment

摘要: This study presents a simple and powerful technique for multichannel measurements of the density profile in laboratory plasmas by microwave interferometry. uses electromechanical switches to temporally switch connection between multiple receiver antennas one phase-detection circuit. Using this method, phase information detected at different positions is rearranged into time series that can be acquired from minimum number data acquisition channels (e.g., two case quadrature detection). Our successfully developed interferometer antenna switching method was applied measure radial electron profiles magnetized plasma experiment. The advantage proposed its compactness scalability multidimensional measurement systems low cost.