Hamiltonian analysis of fast wave current drive in tokamak plasmas
The Hamiltonian formalism is used to analyse the direct resonant interaction between the fast magnetosonic wave and the electrons in a tokamak plasma. The intrinsic stochasticity of the electron phase space trajectories is derived and, together with extrinsic decorrelation processes, is used to assess the validity of the quasilinear approximation for the kinetic studies of fast wave current drive (FWCD). A full-wave resolution of the Maxwell-Vlasov set of equations provides the exact pattern of the wave fields in a complete tokamak geometry, for a realistic antenna spectrum. The local quasilinear diffusion tensor is derived from the wave fields, and is used for a computation of the driven current and deposited power profiles, and the current drive efficiency, including possible nonlinear effects in the kinetic equation. Several applications of FWCD on existing and future machines are given, as well as results concerning combination of FWCD with other non-inductive current drive methods. An analytical expression is given for the current drive efficiency in the high single-pass absorption regimes.
Bibliographic Reference: Report: EUR-CEA-FC-1505 EN (1994)
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199410038 / Last updated on: 1994-11-28
Original language: en
Available languages: en