Radial interchange motions of plasma filaments

摘要: Radial convection of isolated filamentary structures due to interchange motions in magnetized plasmas is investigated. Following a basic discussion vorticity generation, ballooning, and the role sheaths, two-field model studied by means numerical simulations on biperiodic domain perpendicular magnetic field. It demonstrated that blob-like plasma structure develops dipolar electrostatic potential fields, resulting rapid radial acceleration formation steep front trailing wake. While dynamical evolution strongly depends amount collisional diffusion viscosity, travels distance many times its initial size all parameter regimes absence sheath dissipation. In ideal limit, there an inertial scaling for maximum velocity filaments. This scales as acoustic speed square root relative length scale The filament eventually decelerates mixing Finally, dissipation When included simulations, it significantly reduces results are discussed context convective transport scrape-off layer plasmas, comprising both low confinement modes edge localized mode filaments unstable high regimes.