Sökning: "runaway"

Visar resultat 1 - 5 av 32 avhandlingar innehållade ordet runaway.

  1. 1. Kinetic modelling of runaway in plasmas

    Författare :Ola Embréus; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fokker-Planck equation; synchrotron radiation; plasma; runaway; bremsstrahlung; Boltzmann equation;

    Sammanfattning : The phenomenon of runaway occurs in plasmas in the presence of a strong electric field, which overcomes the collisional friction acting on the charged particles moving through the plasma. A subpopulation of particles can then be accelerated to energies significantly higher than the thermal energy. LÄS MER

  2. 2. The role of magnetic perturbations in runaway electron and sawtooth dynamics

    Författare :Gergely Papp; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic perturbation; fusion plasma physics; runaway mitigation; sawtooth oscillation; tokamak; runaway electrons;

    Sammanfattning : As the world's fusion energy program is increasingly focused towards burning plasma experiments, it is important to address the remaining theoretical issues. In this thesis we focus on the effect of magnetic perturbations on the radial plasma transport. LÄS MER

  3. 3. Synchrotron radiation from runaway electrons in plasmas

    Författare :Adam Stahl; [2015]
    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

  4. 4. Runaway electrons and Alfvén eigenmodes in tokamaks

    Författare :Håkan Smith; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; two-way diffusion equation; compressional Alfvén eigenmode; fusion plasma physics; tokamak disruption; runaway electron; Alfvén cascade;

    Sammanfattning : Runaway electrons can be generated as a consequence of the rapid thermal quench of the plasma in a tokamak disruption. If the time scale of this cooling is short compared to the collision time in the tail of the electron velocity distribution, incomplete thermalisation of this tail leads to a burst of runaway production. LÄS MER

  5. 5. Momentum-space dynamics of runaway electrons in plasmas

    Detta är en avhandling från Gothenburg : Chalmers tekniska högskola

    Författare :Adam Stahl; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; synchrotron radiation; tokamak; critical electric field; non-linear collision operator; slide-away; runaway electrons; fusion-plasma physics;

    Sammanfattning : Fast electrons in a plasma experience a friction force that decreases with increasing particle speed, and may therefore be continuously accelerated by sufficiently strong electric fields. These so-called runaway electrons may quickly reach relativistic speeds. LÄS MER