Sökning: "plasma dynamics"

Visar resultat 21 - 25 av 239 avhandlingar innehållade orden plasma dynamics.

1. 21. Effect of Partial Screening on Runaway-Electron Dynamics

   Författare :Linnea Hesslow; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fokker-Planck equation; runaway electrons; tokamak; fusion; plasma physics;

   Sammanfattning : One of the essential results of kinetic plasma physics is the runaway phenomenon: sufficiently large electric fields can accelerate a fraction of an electron population to relativistic energies. While such runaway electrons are fundamentally interesting objects of study in astrophysical settings, they are also of great practical relevance to fusion research. LÄS MER

3. 22. The Jovian Plasma Dynamics and Composition Analyzer (JDC) for ESA's JUICE Mission

   Författare :Philipp Wittmann; Martin Wieser; Stas Barabash; Krister Wiklund; Frédéric Allegrini; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; JUICE mission; positive ions; negative ions; electrons; time-of-flight; time-of-arrival; PEP; JDC; CEM; channel electron multiplier; pressure; instrument development; calibration; TOF; TOA; fysik; Physics; rymd- och plasmafysik; Space and Plasma Physics;

   Sammanfattning : This dissertation covers the development and calibration of the Jovian plasma Dynamics and Composition analyzer (JDC). JDC is together with five other sensors a part of the Particle Environment Package (PEP), one of the payloads of the European Space Agency's JUpiter ICy moons Explorer (JUICE) mission. LÄS MER

4. 23. Kinetic modelling of runaway in plasmas

   Författare :Ola Embréus; Chalmers tekniska högskola; []
   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

5. 24. Kinetic modelling of runaways in plasmas

   Författare :Ola Embréus; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; runaway; Fokker-Planck equation; tokamak; Boltzmann equation; positrons; bremsstrahlung; plasma; synchrotron radiation;

   Sammanfattning : The phenomenon of runaway occurs in plasmas in the presence of a strong electric field, when the accelerating force overcomes the collisional friction acting on the charged particles moving through the plasma. Electron runaway is observed in both laboratory and space plasmas, and is of great importance in fusion-energy research, where the energetic electrons can damage the plasma-facing components of fusion reactors. LÄS MER

7. 25. Collisional effects and attosecond diagnostics in laser-generated plasmas

   Författare :Andréas Sundström; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electrostatic shocks; plasma physics; plasma diagnostics; laser-plasmas; attosecond pulses; extreme-ultraviolet; Coulomb collisions;

   Sammanfattning : When matter is radiated by laser light of extreme intensity, it is rapidly ionized, thereby forming a plasma. Such laser-generated plasmas can be used as sources of energetic particles and radiation, or to study astrophysically relevant phenomena in the laboratory and the behavior of matter under extreme conditions. LÄS MER