title: Thermal imaging of plasma with a phased array antenna in QUEST.
abstract: 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.affiliation: IGSES, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: Kishore
authors.initials: K
authors.lastname: Mishra
authors.affiliation: RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Idei
authors.affiliation: RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Zushi
authors.affiliation: IGSES, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nagata
authors.affiliation: IGSES, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Akimoto
authors.affiliation: Research Institute for Sustainable Humanosphere, Kyoto University, Uji 611-0011, Japan.
authors.forename: M K
authors.initials: MK
authors.lastname: Yamamoto
authors.affiliation: RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hanada
authors.affiliation: RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hasegawa
authors.affiliation: RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nakamura
authors.affiliation: RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Fujisawa
authors.affiliation: RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nagashima
authors.affiliation: IGSES, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Banerjee
authors.affiliation: RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Onchi
authors.affiliation: RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Kuzmin