Symmetry breaking effects of density gradient on parallel momentum transport: A new ρs* effect

R Singh, R Singh, P Kaw, ÖD Gürcan… - Physics of …, 2012 - pubs.aip.org
Symmetry breaking effects of density gradient on parallel momentum transport is studied via
quasilinear theory. It is shown that finite ρ s*(≡ ρ s/L n)⁠, where ρ s is ion sound radius and
L n is density scale length, leads to symmetry breaking of the ion temperature gradient (ITG)
eigenfunction. This broken symmetry persists even in the absence of mean poloidal (from
radial electric field shear) and toroidal flows. This effect, as explained in the text, originates
from the divergence of polarization particle current in the ion continuity equation. The form of …
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