Oscillating field current drive and nonlinear plasma response in bootstrapped tokamaks

Autor:	R. H. Weening
Rok vydání:	1995
Předmět:	Physics Ohm's law Tokamak Plasma Condensed Matter Physics Magnetic flux law.invention Bootstrap current symbols.namesake Nuclear magnetic resonance Physics::Plasma Physics Magnetic helicity law Quantum electrodynamics symbols Plasma stability Dynamo
Zdroj:	Physics of Plasmas. 2:2735-2743
ISSN:	1089-7674 1070-664X
DOI:	10.1063/1.871238
Popis:	The nonlinear response of bootstrapped tokamaks to oscillating field current drive (OFCD) is studied with the aid of a formal mathematical solution. The tokamak plasma response to OFCD is shown to be similar to that of a driven inductor–resistor (LR) circuit, but the effective plasma resistance can be negative. A physical picture is constructed in which the tokamak bootstrap effect is viewed as a nonlinear amplification of the plasma magnetic helicity. The bootstrap amplifier can rectify the toroidal plasma current. The importance of the tokamak thermal instability for peaking the plasma current and creating a plasma dynamo is stressed. Estimates are made which suggest that steady‐state tokamak fusion reactors operating with OFCD may be achievable with moderate amplitude toroidal magnetic flux and loop voltage oscillations and oscillation driving frequencies significantly below the audible frequency range.
Databáze:	OpenAIRE
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