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

This study presents a simple and powerful technique for multichannel measurements of the density profile in laboratory plasmas by microwave interferometry. This technique uses electromechanical microwave switches to temporally switch the connection between multiple receiver antennas and one phase-detection circuit. Using this method, the phase information detected at different positions is rearranged into a time series that can be acquired from a minimum number of data acquisition channels (e.g., two channels in the case of quadrature detection). Our successfully developed multichannel microwave interferometer that uses the antenna switching method was applied to measure the radial electron density profiles in a magnetized plasma experiment. The advantage of the proposed method is its compactness and scalability to multidimensional measurement systems at low cost.
Authors:
;  [1] ;  [2] ; ;  [1] ;  [3]
  1. Institute of Space and Plasma Sciences, National Cheng Kung University, Tainan 70101, Taiwan (China)
  2. Art, Science and Technology Center for Cooperative Research, Kyushu University, Kasuga 816-8580 (Japan)
  3. (China)
Publication Date:
OSTI Identifier:
22253526
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ANTENNAS; DATA ACQUISITION; ELECTRON DENSITY; INTERFEROMETERS; INTERFEROMETRY; MICROWAVE RADIATION; PLASMA; QUADRATURES; SWITCHES