Low frequency fields driven by the Ergodic Magnetic Limiter at rational surfaces in rotating tokamak plasmas
AUTOR(ES)
Rondán, E. R., Elfimov, A. G., Galvão, R. M. O., Pires, C. J. A.
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2004-12
RESUMO
The rotating low frequency (RLF) field penetration and dissipation and the effect of ponderomotive forces driven by Ergodic Magnetic Limiter (EML) on the poloidal/ toroidal flow in tokamak plasmas are discussed. EML coils are represented as a sheet current expanded in Fourier series with poloidal/toroidal wave numbers M/N depending on coil shape and feeding. The Alfvén wave mode conversion effect in the RLF range is found responsible for wave dissipation at the rational magnetic surfaces qr = -M/N = 3 typical for EML coil design. Analytical and numerical calculations show maximums of LF field dissipation at the local Alfvén wave resonance omega = ½k||cA½ near the rational magnetic surface qr = 3 in Tokamak Chauffage Alfvén Brésilien. The poloidal rotation velocity U, taken into account in the dielectric tensor, can strongly modify the LF field and dissipated power profiles. Even stationary EML fields can dissipate at the local Alfvén wave resonance (UM/rA = k||cA). Preliminary estimations show that the stationary EML fields can decelerate the plasma rotation.
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