Inertial blob-hole symmetry breaking in magnetised plasma filaments
arXiv:1502.05494 · doi:10.1088/0741-3335/57/4/045012
Abstract
Symmetry breaking between the propagation velocities of magnetised plasma filaments with large positive (blob) and negative (hole) amplitudes, as implied by a dimensional analysis scaling, is studied with global ("full-n") non-Boussinesq gyrofluid computations, which include finite inertia effects through nonlinear polarisation. Interchange blobs on a flat density background have higher inertia and propagate more slowly than holes. In the presence of a large enough density gradient, the effect is reversed: blobs accelerate down the gradient and holes are slowed in their propagation up the gradient. Drift wave blobs spread their initial vorticity rapidly into a fully developed turbulent state, whereas primary holes can remain coherent for many eddy turnover times. The results bear implications for plasma edge zonal flow evolution and tokamak scrape-off-layer transport.
arXiv commentSubmitted to "Plasma Physics and Controlled Fusion"
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- Interchange instability and transport in matter-antimatter plasmas
- Isotope effect on gyro-fluid edge turbulence and zonal flows
- Isotope effect on filament dynamics in fusion edge plasmas
- Interchange transport in electron-positron plasmas with ion impurities
- Isotope effect on blob-statistics in gyrofluid simulations of scrape-off layer turbulence