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Effects of the g factor in semiclassical kinetic plasma theory
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
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2008 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 101, no 24, 245002-245006 p.Article in journal (Refereed) Published
Abstract [en]

A kinetic theory for spin plasmas is put forward, generalizing those of previous authors. In the model, the ordinary phase space is extended to include the spin degrees of freedom. Together with Maxwell's equations, the system is shown to be energy conserving. Analyzing the linear properties, it is found that new types of wave-particle resonances are possible that depend directly on the anomalous magnetic moment of the electron. As a result, new wave modes, not present in the absence of spin, appear. The implications of our results are discussed.

Place, publisher, year, edition, pages
American Physical Society , 2008. Vol. 101, no 24, 245002-245006 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-18708DOI: 10.1103/PhysRevLett.101.245002OAI: oai:DiVA.org:umu-18708DiVA: diva2:174628
Available from: 2009-02-24 Created: 2009-02-24 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Modelling of spin and other quantum effects in plasmas
Open this publication in new window or tab >>Modelling of spin and other quantum effects in plasmas
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The development of quantum mechanics during the 20th century gave rise to a completely new way of describing physics. The interpretation of quantum theory is inherently difficult: for example, many-body systems are described by a so called density matrix which has no straightforward analogue in classical theory. However, in the 30’s Wigner proposed an alternative way of describing many-body systems, using a quasi-probability distribution function. This made the connection between classical and quantum kinetic theory clearer.

This thesis is concerned with modelling of quantum effects in plasmas. The focus lies on describing plasmas containing spin-1/2 particles. For this purpose, new models, based on quantum kinetic theory, are derived. This is achieved by starting from the evolution equation for the density matrix and applying a combination of the Wigner transformation for the position degree of freedom and the Q-transformation for the spin. The properties of the resulting kinetic theory are then investigated and it is shown to satisfy basic necessary criteria such as energy conservation. The kinetic equation is then used to derive a fluid theory for spin-1/2 particles.

In this thesis the kinetic and fluid models are applied to different problems in quantum plasma physics. For example it will be shown that the quantum electrodynamic correction to the electron g-factor can give rise to a wave mode which lacks classical analogue, and that spin may affect the damping rate of Alfvén waves. The models will also be applied to nonlinear problems and it will be shown that they give rise to modifications of the so called spin ponderomotive force.

Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2012. 33 p.
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:umu:diva-53320 (URN)978-91-7459-385-3 (ISBN)
Public defence
2012-04-13, Naturvetarhuset, N430, Umeå Universitet, Umeå, 10:00 (English)
Opponent
Supervisors
Available from: 2012-03-23 Created: 2012-03-20 Last updated: 2012-03-22Bibliographically approved

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