Model of driven and decaying magnetic turbulence in a cylinder
2011 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, Vol. 84, 56407- p.Article in journal (Refereed) Published
Using mean-field theory, we compute the evolution of the magnetic field in a cylinder with outer perfectly conducting boundaries and imposed axial magnetic and electric fields. The thus injected magnetic helicity in the system can be redistributed by magnetic helicity fluxes down the gradient of the local current helicity of the small-scale magnetic field. A weak reversal of the axial magnetic field is found to be a consequence of the magnetic helicity flux in the system. Such fluxes are known to alleviate so-called catastrophic quenching of the α effect in astrophysical applications. A stronger field reversal can be obtained if there is also a significant kinetic α effect. Application to the reversed field pinch in plasma confinement devices is discussed.
Place, publisher, year, edition, pages
2011. Vol. 84, 56407- p.
Field-reversed configurations, rotamaks, astrons, ion rings, magnetized target fusion, and cusps, Current drive, helicity injection, Magnetohydrodynamic and fluid equation, Sun spots, solar cycles
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-70043DOI: 10.1103/PhysRevE.84.056407ISI: 000297467500005OAI: oai:DiVA.org:su-70043DiVA: diva2:478717
authorCount: 3;2012-01-162012-01-162012-09-30Bibliographically approved