title: Ion-induced gamma-ray detection of fast ions escaping from fusion plasmas.
abstract: A 12 × 12 pixel detector has been developed and used in a laboratory experiment for lost fast-ion diagnostics. With gamma rays in the MeV range originating from nuclear reactions (9)Be(α, nγ)(12)C, (9)Be(d, nγ)(12)C, and (12)C(d, pγ)(13)C, a high purity germanium (HPGe) detector measured a fine-energy-resolved spectrum of gamma rays. The HPGe detector enables the survey of background-gamma rays and Doppler-shifted photo peak shapes. In the experiments, the pixel detector produces a gamma-ray image reconstructed from the energy spectrum obtained from total photon counts of irradiation passing through the detector's lead collimator. From gamma-ray image, diagnostics are able to produce an analysis of the fast ion loss onto the first wall in principle.
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nishiura
authors.affiliation: Graduate School of Science and Engineering, Doshisha University, Kyotanabe 610-0321, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Doi
authors.affiliation: Graduate School of Maritime Sciences, Kobe University, Kobe 658-0022, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Taniike
authors.affiliation: Graduate School of Maritime Sciences, Kobe University, Kobe 658-0022, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Matsuki
authors.affiliation: Graduate School of Engineering, The University of Tokyo, Tokyo 113-8654, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shimazoe
authors.affiliation: Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8561, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Mushiake
authors.affiliation: Furukawa Co. Ltd., Tsukuba, Ibaraki 305-0856, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yoshino
authors.affiliation: National Institute for Fusion Science, Toki, Gifu 509-5292, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nagasaka
authors.affiliation: Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Fujimoto
authors.affiliation: Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Fujioka
authors.affiliation: National Institute for Fusion Science, Toki, Gifu 509-5292, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Tanaka
authors.affiliation: National Institute for Fusion Science, Toki, Gifu 509-5292, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kisaki
authors.affiliation: RIKEN SPring-8 center, RIKEN, Sayo, Hyogo 679-5148, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yamaoka
authors.affiliation: Tokushima Bunri University, Tokushima 770-8514, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumoto
authors.affiliation: Graduate School of Science and Engineering, Doshisha University, Kyotanabe 610-0321, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Wada