title: Fast ion measurement using a hybrid directional probe in the large helical device.
abstract: A hybrid directional probe was newly installed in the large helical device for fast ion measurement. The collector of the probe mounts a thermocouple to estimate local power flux and can be also utilized as a collector of a conventional Langmuir probe; therefore, the hybrid directional probe can simultaneously measure both local power density flux and current flux at the same collector surface. The concept and design of the hybrid directional probe, the calibration of the power density measurement, and preliminary result of the fast ion measurement are presented.
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Nagaoka
authors.forename: Kiyomasa Y
authors.initials: KY
authors.lastname: Watanabe
authors.forename: Masaki
authors.initials: M
authors.lastname: Osakabe
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Takeiri
authors.forename: Takashi
authors.initials: T
authors.lastname: Minami
authors.forename: Kazuo
authors.initials: K
authors.lastname: Toi
authors.forename: Mitsutaka
authors.initials: M
authors.lastname: Isobe
authors.forename: Masaki
authors.initials: M
authors.lastname: Nishiura
authors.forename: Takafumi
authors.initials: T
authors.lastname: Ito
authors.forename: Kunihiro
authors.initials: K
authors.lastname: Ogawa