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Author(s):
K. Ida, S. Hidekuma, Y. Miura, T. Fujita, M. Mori, K. Hoshino, N. Suzuki, T. Yamaguchi and JFT-2M Group
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Title:
Edge Electron Field Profiles of H-mode Plasmas in JFT-2M Tokamak
Date of publication:
Apr. 1990
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Key words:
tokamak H-mode, L/H transition, poloidal rotation, radial electric field
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Abstract:
A structure of an edge radial electric field E_r Inferred from poloidal rotation velocity is compared with that of particle/thermal transport barrier for H-mode plasmas in JFT-2M. Both of E_r and its gradient ( partial E _r/partial r) in the thermal transport barrier are found to become more negative at the L/H transition. The shear of radial electric field and poloidal rotation velocity in H-mode is localized within an ion poloidal gyro radius near the separatrix, in the region of ion collisionality nu_{star i} approx l0-40.
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