UKAEA Papers

"Gyrokinetic applications in electron-positron and non-neutral plasmas"

• Alexey Mishchenko
• Daniel Kennedy
• Per Helander
• Axel Konies
• Gabriel Plunk
• Pavlos Xanthopoulos
• Alessandro Zocco

In this paper, we summarize our recent work on gyrokinetic applications in electron- positron and non-neutral plasma. The electrostatic stability of electron-positron plasmas was investigated in dipole and slab geometry, with and without ion admixture. The gyrokinetic dispersion relation was derived and, for the slab case, extended to non-neutra…

"Ion Landau Damping and Drift Tearing Modes"

• J W Connor
• C J Ham
• R J Hastie
• A Zocco

Kinetic treatments of drift tearing modes that match an inner, resonant layer solution to an external MHD solution, can fail to match the ideal MHD boundary condition on the parallel electric field. In this paper we demonstrate how consideration of ion sound and ion Landau damping effects achieves this, placing the theory on a firm footing. The …

"Global gyrokinetic particle-in-cell simulations of internal kink instabilities"

• Alexey Mishchenko
• Alessandro Zocco

"Reduced fluid-kinetic equations for low-frequency dynamics, magnetic reconnection, and electron heating in low-beta plasmas"

• Alessandro Zocco
• Alexander A. Schekochihin

A minimal model for magnetic reconnection and, generally, low-frequency dynamics in low-beta plasmas is proposed. The model combines analytical and computational simplicity with physical realizability: it is a rigorous limit of gyrokinetics for plasma beta of order the electron-ion mass ratio. The model contains collisions and can be used both in t…