Geodesic acoustic mode induced by toroidal rotation in tokamaks
2008 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 101, no 11, 115003- p.Article in journal (Refereed) Published
The effect of toroidal rotation on the geodesic acoustic mode (GAM) in a tokamak is studied. It is shown that, in addition to a small frequency upshift of the ordinary GAM, another GAM, with much lower frequency, is induced by the rotation. The new GAM appears as a consequence of the nonuniform plasma density and pressure created by the centrifugal force on the magnetic surfaces. Both GAMs in a rotating plasma are shown to exist both as continuum modes with finite mode numbers m and n at the rational surfaces q = m/n as well as in the form of axisymmetric modes with m = n = 0.
Place, publisher, year, edition, pages
2008. Vol. 101, no 11, 115003- p.
IdentifiersURN: urn:nbn:se:uu:diva-107898DOI: 10.1103/PhysRevLett.101.115003ISI: 000259188700025OAI: oai:DiVA.org:uu-107898DiVA: diva2:233498