title: Observation of the fast potential change at L-H transition by a heavy-ion-beam probe on JFT-2M.
abstract: The fast potential change near the separatrix is measured directly at the L-H transition by a heavy-ion-beam probe. The potential changes with two different time scales at the L-H transition triggered by a sawtooth crash: it drops at first with the time scale of 10--100 mus just after the arrival of the heat pulse due to the sawtooth crash. Then, it decreases again at a few 100 mus after the first drop at a time scale of about 200 mus.
authors.affiliation: National Institute for Fusion Science, Oroshi, Toki, 509-5292, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ido
authors.forename: K
authors.initials: K
authors.lastname: Kamiya
authors.forename: Y
authors.initials: Y
authors.lastname: Miura
authors.forename: Y
authors.initials: Y
authors.lastname: Hamada
authors.forename: A
authors.initials: A
authors.lastname: Nishizawa
authors.forename: Y
authors.initials: Y
authors.lastname: Kawasumi