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Neoclassical nature of the radial electric field at the low-to-high confinement transition

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Coster,  D. P.
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

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Schneider,  R.
Stellarator Theory (ST), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Kiviniemi, T. P., Sipilä, S. K., Rozhansky, V. A., Voskoboynikov, S. P., Kaveeva, E. G., Heikkinen, J. A., et al. (2003). Neoclassical nature of the radial electric field at the low-to-high confinement transition. Physics of Plasmas, 10(6), 2604-2607. doi:10.1063/1.1570827.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-3F2A-A
Abstract
The radial electric field Er at the tokamak plasma edge is simulated both with a two-dimensional (2D) fluid code solving the most complete system of transport equations and with five-dimensional (three-dimensional in configuration space and 2D in velocity space) Monte Carlo particle following code. At low to high confinement transition conditions, the Er×B shearing rate is found to be high enough for turbulence suppression even though the field is essentially neoclassical. Here, B is the magnetic field. No bifurcation of Er is found.