Ion-scale Transition of Plasma Turbulence: Pressure–Strain Effect

Spatial structure of ion-scale plasma turbulence

1 Space Research Institute, Austrian Academy of Sciences, Graz, Austria 2 Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany 3 Institut für Theoretische Physik, Technische Universität Braunschweig, Braunschweig, Germany 4 Institute for Space Sciences, Bucharest-Măgurele, Romania 5 Institut für Planetenforschung, Deutsches Zentrum für...

Suppressed ion-scale turbulence in a hot high-β plasma

An economic magnetic fusion reactor favours a high ratio of plasma kinetic pressure to magnetic pressure in a well-confined, hot plasma with low thermal losses across the confining magnetic field. Field-reversed configuration (FRC) plasmas are potentially attractive as a reactor concept, achieving high plasma pressure in a simple axisymmetric geometry. Here, we show that FRC plasmas have unique...

Cross-Scale Interactions between Electron and Ion Scale Turbulence in a Tokamak Plasma.

Multiscale gyrokinetic turbulence simulations with the real ion-to-electron mass ratio and β value are realized for the first time, where the β value is given by the ratio of plasma pressure to magnetic pressure and characterizes electromagnetic effects on microinstabilities. Numerical analysis at both the electron scale and the ion scale is used to reveal the mechanism of their cross-scale int...

Ion-Scale Sideband Waves and Filament Formation: Alfvénic Impact on Heliospheric Plasma Turbulence

New Characteristics of Zonal Flows in Multi-scale Plasma Turbulence

The evolution of multi-scale plasma turbulence including resistive MHD and micro-instability is studied based on a 5-field gyrofluid simulation aiming to understand complex nonlinear interaction and turbulent transport. Here we report two new findings on the zonal flow (ZF) characteristics: (1) A robust oscillatory ZF with finite frequency is created in slab geometry for the first time due to t...