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- W2785654911 abstract "In fusion plasmas, high-energy ions arising from plasma heating as wellas being generated in fusion reactions may lead to the occurrence ofwave micro-instabilities. The basic reason for these instabilities is thedeviation of the high-energy ions distribution function from the thermodynamicequilibrium. The presence of thermonuclear instabilities mayin turn cause anomalous losses of plasma energy and high-energy particlesand consequently may have direct impact on the operation scenariosand ignition conditions. Investigations of the initial phase of these instabilitiesare connected with an identification of the stability thresholdwith respect to wave excitation by fast ions as well as with the studyof nonlinear dynamics of the wave - fast ion system above the stabilitythreshold.The theory describing the nonlinear dynamics of a driven mode nearthe marginal stability threshold has been developed by H. Berk andB. Breizmann et al. in the 90’s and was also verefied to some extendin tokamak experiments. This theory is limited to the case of only asingle plasma mode with a fixed wave number. However, in practicemany plasma modes with different wave numbers may be excited in atokamak plasma.In the present thesis, the single mode theory is extended to the caseof two different, linearly unstable plasma modes driven by fast ions at thelinear stability threshold. Futhermore, based on analogy to mechanicalnonlinear systems, the model equations are reduced to a set of differentialequations of the nonlinear oscillator type. Numerical analysis of the twomode model reveals interesting features of the mode amplitude behavior,depending on the effect of classical relaxation processes represented bythe Krook, diffusive, and dynamical friction collision operators." @default.
- W2785654911 created "2018-02-23" @default.
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- W2785654911 date "2012-01-01" @default.
- W2785654911 modified "2023-09-27" @default.
- W2785654911 title "Nonlinear Evolution of Plasma Modes Driven by Fast Particles in Tokamaks" @default.
- W2785654911 hasPublicationYear "2012" @default.
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