Fast particles-wave interaction in the Alfvén frequency range on the Joint European Torus tokamak
摘要：
Wave-particle interaction phenomena in the Alfvén Eigenmode (AE) frequency range are investigated at the Joint European Torus [P. H. Rebut and B. E. Keen, Fusion Technol.11, 13 (1987)] using active and passive diagnostic methods. Fast particles are generated by neutral beam injection, ion cyclotron resonance heating, and fusion reactions. External antennas are used to excite stable AEs and measure fast particle drive and damping separately. Comparisons with numerical calculations lead to an identification of the different damping mechanisms. The use of the active AE diagnostic system to generate control signals based on the proximity to marginal stability limits for AE and low-frequency magnetohydrodynamic (MHD) modes is explored. Signatures of the different nonlinear regimes of fast particle driven AE instabilities predicted by theory are found in the measured spectra. The diagnostic use of AE measurements to get information both on the plasma bulk and the fast particle distribution is assessed.
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关键词：
Experimental/ plasma beam injection heating plasma diagnostics plasma instability plasma magnetohydrodynamics plasma radiofrequency heating plasma toroidal confinement plasma-beam interactions/ fast particles-wave interaction Alfven eigenmode frequency range Joint European Torus tokamak JET wave-particle interaction phenomena active diagnostic methods passive diagnostic methods neutral beam injection ion cyclotron resonance heating fusion reactions external antennas fast particle drive numerical calculations low-frequency magnetohydrodynamic modes nonlinear regimes instabilities fast particle distribution/ A5255G Plasma in torus (stellarator, tokamak, etc.) A5240M Particle beam interactions in plasma A5250G Plasma heating A5235P Plasma instabilities A5270 Plasma diagnostic techniques and instrumentation
DOI：
10.1063/1.874003
被引量：
年份：
2000
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