Sökning: "wave-particle interaction"
Visar resultat 1 - 5 av 11 avhandlingar innehållade orden wave-particle interaction.
1. O⁺ heating in the high altitude cusp and mantle due to wave-particle interaction
Sammanfattning : This thesis is composed of three articles, which have the common denominator that they are studies of heating of oxygen ions in the high altitude cusp and mantle in the terrestrial magnetosphere. All data analysis are based on observational data from the Cluster satellites. LÄS MER
2. Nonlinear dynamics of frequency sweeping energetic particle modes in tokamaks
Sammanfattning : In a burning plasma, such as the next generation tokamak experiment ITER, significant numbers of highly energetic particles will be produced via nuclear reactions. The presence of energetic particles, be it fusion born alpha particles or ions accelerated by auxiliary heating schemes, may excite kinetic instabilities and thereby affect the heating and transport of all particles in the plasma. LÄS MER
3. Fast ions and turbulent particle transport in tokamaks
Sammanfattning : The presence of highly energetic (fast) ions, be it fusion born alpha particles or ions accelerated by auxiliary heating schemes, can affect the heating and transport of all particles in the plasma through two main mechanisms. First, fast ions may excite fast ion driven instabilities. LÄS MER
4. Nonlinear interaction and propagation of gravitational and electromagnetic waves in plasmas
Sammanfattning : Gravitational waves and electromagnetic waves are important as carriers of energy and information. This thesis is devoted to the study of the propagation and interaction of these waves in plasmas, with emphasis on nonlinear effects and applications within astrophysics. LÄS MER
5. Non-linear dynamics of Alfvén eigenmodes excited by fast ions in tokamaks
Sammanfattning : The tokamak is so far the most promising magnetic configuration for achieving a net production of fusion energy. The D-T fusion reactions result in 3.5 MeV alpha-particles, which may destabilize Alfvén eigenmodes through wave-particle interaction. LÄS MER