Hamiltonian analysis of fast wave current drive in tokamak plasmas

Journal Article · Thu Sep 01 00:00:00 EDT 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870531· OSTI ID:6693304

Becoulet, A; Fraboulet, D; Giruzzi, G; Moreau, D; Saoutic, B ^[1]; Chinardet, J ^[2]

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1. Association EURATOM-CEA sur la Fusion Controlee, Centre d'Etudes de Cadarache, 13108 Saint-Paul-lez-Durance (France)
2. CISI Ingenierie, Centre d'Etudes de Cadarache, 13108 Saint-Paul-lez-Durance (France)

The Hamiltonian formalism is used to address the problem of the direct resonant interaction between the fast magnetosonic wave and the electrons in a tokamak plasma. The intrinsic stochasticity of the electron trajectories in phase space is first derived. Together with extrinsic decorrelation processes, it assesses the validity of the quasilinear approximation for the kinetic studies of fast wave current drive (FWCD). A full-wave solution of the Maxwell--Vlasov set of equations provides the exact pattern of the wave fields in the tokamak geometry, consistent with a realistic antenna spectrum. The local quasilinear diffusion tensor is then derived from the wave fields and the driven current density profile, the power deposition profile and the current drive efficiency are computed, including possible nonlinear effects in the kinetic equation. Several applications of FWCD on existing and future machines are given, and the combination of FWCD with other noninductive current drive methods is investigated. Finally, an analytical expression for the current drive efficiency is derived in the moderate to high single-pass absorption regime.

• OSTI ID: 6693304
• Journal Information: Physics of Plasmas; (United States), Vol. 1:9; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
TOKAMAK DEVICES
CURRENT-DRIVE HEATING
FAST MAGNETOACOUSTIC WAVES
CURRENT DENSITY
DIFFUSION
ELECTRONS
HAMILTONIAN FUNCTION
HIGH-BETA PLASMA
PHASE SPACE
STOCHASTIC PROCESSES
CLOSED PLASMA DEVICES
ELECTRIC HEATING
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
HEATING
HYDROMAGNETIC WAVES
JOULE HEATING
LEPTONS
MAGNETOACOUSTIC WAVES
MATHEMATICAL SPACE
PLASMA
PLASMA HEATING
RESISTANCE HEATING
SPACE
THERMONUCLEAR DEVICES
700330* - Plasma Kinetics
Transport
& Impurities- (1992-)
700380 - Elementary & Classical Processes in Plasmas- (1992-)
700340 - Plasma Waves
Oscillations
& Instabilities- (1992-)
700350 - Plasma Production
Heating
Current Drive
& Interactions- (1992-)