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Title: Thermal imaging of plasma with a phased array antenna in QUEST

A thermal imaging system to measure plasma Electron Bernstein Emission (EBE) emanating from the mode conversion region in overdense plasma is discussed. Unlike conventional ECE/EBE imaging, this diagnostics does not employ any active mechanical scanning mirrors or focusing optics to scan for the emission cones in plasma. Instead, a standard 3 × 3 waveguide array antenna is used as a passive receiver to collect emission from plasma and imaging reconstruction is done by accurate measurements of phase and intensity of these signals by heterodyne detection technique. A broadband noise source simulating the EBE, is installed near the expected mode conversion region and its position is successfully reconstructed using phase array technique which is done in post processing.
Authors:
; ; ;  [1] ; ; ; ; ; ; ; ; ;  [2] ;  [3]
  1. IGSES, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan)
  2. RIAM, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan)
  3. Research Institute for Sustainable Humanosphere, Kyoto University, Uji 611-0011 (Japan)
Publication Date:
OSTI Identifier:
22308658
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; 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; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANTENNAS; DETECTION; ELECTRON EMISSION; FOCUSING; MIRRORS; MODE CONVERSION; OPTICS; PLASMA; PROCESSING; SIGNALS; WAVEGUIDES