Sökning: "Fokker-Planck"

Visar resultat 11 - 15 av 28 avhandlingar innehållade ordet Fokker-Planck.

  1. 11. Kinetic modeling of runaway-electron dynamics in partially ionized plasmas

    Författare :Linnea Hesslow; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; runaway electrons; tokamaks; plasma physics; magnetic confinement fusion; electron-ion collisions; Fokker-Planck equation;

    Sammanfattning : An essential result of kinetic plasma physics is the runaway phenomenon, whereby a fraction of an electron population can be accelerated to relativistic energies. Such runaway electrons are formed in astrophysical settings, but are also of great practical relevance to fusion research. LÄS MER

  3. 12. Runaway-electron model development and validation in tokamaks

    Författare :Mathias Hoppe; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic confinement fusion; Fokker--Planck equation; synchrotron radiation; tokamaks; runaway-electrons; plasma physics;

    Sammanfattning : Magnetic confinement fusion (MCF), in which a hot plasma at more than 100 million kelvin is confined using magnetic fields, is the most successful fusion energy concept developed to date. After decades of research, MCF devices designed to demonstrate a positive net energy output are being constructed, completing a crucial milestone on the path to making fusion a commercially viable energy source. LÄS MER

  4. 13. Methods for Stochastic Optimal Control under State Constraints

    Författare :Per Rutquist; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; control theory; optimal control; stochastic systems; Hamilton-Jacobi-Bellmanequation; Fokker-Planck-Kolmogorov equation;

    Sammanfattning : This thesis looks at a few different approaches to solving stochas-tic optimal control problems with state constraints. The motivatingproblem is optimal control of an energy buffer in a hybrid vehicle,although applications are abundant in a number of areas. LÄS MER

  5. 14. Some numerical and analytical methods for equations of wave propagation and kinetic theory

    Författare :Eva Mossberg; Alexander Bobylev; Giovanni Russo; Karlstads universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; wave propagation; finite difference metods high order methods; Landau-Fokker-Planck equation; Monte-Carlo simulations; Boltzmann equation; hard sphere model; eigenvalue problem; MATHEMATICS; MATEMATIK; Matematik; Mathematics;

    Sammanfattning : This thesis consists of two different parts, related to two different fields in mathematical physics: wave propagation and kinetic theory of gases. Various mathematical and computational problems for equations from these areas are treated. LÄS MER

  7. 15. A General Formalism for Continuous Feedback Control in Quantum Systems

    Författare :Björn Annby-Andersson; NanoLund: Centre for Nanoscience; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; quantum measurements; quantum control; stochastic thermodynamics; information thermodynamics; full count- ing statistics; open quantum systems; Quantum measurements; Quantum control; Stochastic thermodynamics; Information thermodynamics; Full counting statistics; Open quantum systems;

    Sammanfattning : This thesis devolops a general formalism for continuous feedback control in quantum systems. The main result is a quantum Fokker-Planck master equation describing the joint dynamics of a quantum system and a detector with finite bandwidth. For a fast detector, this equation can be reduced to a Markovian master equation for the system dynamics. LÄS MER