Sökning: "bump-on-tail instabilities"

Hittade 5 avhandlingar innehållade orden bump-on-tail instabilities.

1. 1. Fast ions and turbulent particle transport in tokamaks

   Författare :Frida Eriksson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NBI; numerical modelling; turbulence; drift waves; bump-on-tail; density peaking; Fusion plasma physics; wave-particle interaction;

   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

3. 2. Nonlinear dynamics of frequency sweeping energetic particle modes in tokamaks

   Författare :Frida Eriksson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; wave-particle interaction; Fusion plasma physics; bump-on-tail; toroidal Alfvén eigenmode; holes and clumps;

   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

4. 3. The dynamics of Alfvén eigenmodes excited by energetic ions in toroidal plasmas

   Författare :Emmi Tholerus; Thomas Johnson; Torbjörn Hellsten; Duarte Borba; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fusion plasma physics; Tokamak; Wave–particle interactions; Toroidal Alfvén eigenmodes; Bump-on-tail instabilities; Magnetohydrodynamics; Nonlinear dynamics; Quasilinear dynamics; Hamiltonian mechanics; Monte Carlo method; ICRH; FWCD; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : The future fusion power plants that are based on magnetic confinement will deal with plasmas that inevitably contain energetic (non-thermal) particles. These particles come, for instance, from fusion reactions or from external heating of the plasma. LÄS MER

5. 4. The dynamics of Alfvén eigenmodes excited by energetic ions in toroidal plasmas

   Författare :Emmi Tholerus; Torbjörn Hellsten; Thomas Johnson; Lars-Göran Eriksson; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fusion plasma physics; tokamak; wave-particle interactions; toroidal Alfvén eigenmodes; bump-on-tail instabilities; magnetohydrodynamics; nonlinear dynamics; quasilinear dynamics; Hamiltonian mechanics; Monte Carlo method; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : Experiments for the development of fusion power that are based on magnetic confinement deal with plasmas that inevitably contain energetic (non-thermal) particles. These particles come e.g. from fusion reactions or from external heating of the plasma. LÄS MER

7. 5. Synchrotron radiation from runaway electrons in plasmas

   Författare :Adam Stahl; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; runaway electrons; critical electric field; fusion plasma physics; tokamak; synchrotron radiation;

   Sammanfattning : Highly relativistic runaway electrons are of great concern in the area of fusion energy research, since their presence in tokamak plasmas have the potential to hinder the successful and stable operation of the device, and potentially cause severe structural damage. In this thesis, runaway electron generation dynamics is investigated using the newly developed efficient computational tool CODE. LÄS MER