Observation of the fast potential change at L-H transition by a heavy-ion-beam probe on JFT-2M.
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.
Ido
T
T
National Institute for Fusion Science, Oroshi, Toki, 509-5292, Japan.
Kamiya
K
K
Miura
Y
Y
Hamada
Y
Y
Nishizawa
A
A
Kawasumi
Y
Y