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(THP2/35) Effect of the Radial Electric Field, Induced by Alfvén Waves, on Transport Processes in Tokamaks

   
V. S. Tsypin ¹, R. M. O. Galvão ¹, I. C. Nascimento ¹, A.G. Elfimov 1 , M. Tendler ², C. A. de Azevedo ³, A. S. de Assis ^4
 
1 Physics Institute, University of São Paulo, Cx. Postal 20516, Brazil
² The Alfvén Laboratory, EURATOM-NFR, 10044 Stockholm, Sweden
³ Institute of Physics, State University of Rio de Janeiro, 20550-013, Brazil
⁴ Institute of Mathematics, Fluminense Federal University, Niterói, Brazil

Abstract
We demonstrate that Alfvén waves  may be the convenient trigger for the formation and maintenance of edge and internal transport barriers  due to their small radial localizations. Kinetic Alfvén waves can also provide a mechanism for squeezing the banana orbits of ions in weekly collisional plasmas of tokamaks. It is shown that the radial electric field, induced by Alfvén waves, at some conditions has a nonlinear dependence on the radio-frequency absorbed power. The dependence of the ion heat conductivity and of the ion poloidal viscosity on the radio-frequency absorbed power is obtained in this paper for tokamak plasmas with ion banana orbit squeezed by Alfvén waves. Estimations of the proper absorbed power of Alfvén waves in some tokamaks is about the level of absorbed power to be used in early fulfilled experiments.

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