Thermal imaging of plasma with a phased array antenna in QUEST

Journal Article · Sat Nov 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4889903· OSTI ID:22308658

Mishra, Kishore; Nagata, K.; Akimoto, R.; Banerjee, S. ^[1]; Idei, H.; Zushi, H.; Hanada, K.; Hasegawa, M.; Nakamura, K.; Fujisawa, A.; Nagashima, Y.; Onchi, T.; Kuzmin, A. ^[2]; Yamamoto, M. K. ^[3]

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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)

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.

• OSTI ID: 22308658
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

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