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(PDP/01) Fast Potential Changes at H-Mode Transition in the JFT-2M Tokamak

   
Y. Hamada , T. Ido , K. Kamiya , A. Nishizawa , Y. Kawasumi 
National Institute for Fusion Science, Toki, 509-5292, Japan
 
Y. Miura , and JFT-2M Team 
Japan Atomic Energy Research Institute, Ibaraki, 319-1195, Japan

Abstract
The fast potential change at H-mode  transition was measured for the first time by a 500 keV heavy ion beam probe installed on the JFT-2M  tokamak. It is found that in an ordinary sawtooth-triggered L/H-transition, the fast positive potential change is observed near the separatrix in coincidence with the fast $\rm D_\alpha$ rise and the fast density change. The potential goes down at the fall of $\rm D_\alpha$. The structure of the radial electric field about 30 msec after L/H transition agrees with the previous results determined by the poloidal, toroidal rotation speed and the pressure gradient.

   

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