Erlangen 2018 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 11: Helmholtz Graduate School - Poster

P 11.22: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

Gyrokinetics of electron-positron plasmas — •Daniel Kennedy, Alexey Mishchenko, and Per Helander — Max-Planck-Institut für plasmaphysik

The prospects of creating electron-positron pair plasmas magnetically confined in dipole geometries have been discussed since early 2000*s (Pedersen et al. 2003). In the immediate future, the first experiment aiming at this goal will be constructed (Pedersen et al. 2012). Recently, efficient injection and trapping of a cold positron beam in a dipole magnetic field configuration has been demonstrated by Saitoh et al. (2015). This result is a key step towards the ultimate aim of creating and studying of the first man-made magnetically-confined pair plasma in the laboratory.

It has been shown by Helander (2014) and Helander and Connor (2016) that the pair plasmas possess unique gyrokinetic stability properties due to the mass symmetry between the particle species. For example, drift instabilities are completely absent in pure pair plasma in a slab geometry.

However, in creating and confining a pair plasma experimentally, there will be a timescale, during the positron injection, on which plasma quasineutrality has not yet been established. This could lead to interesting behaviour in the plasma. Here we will present the first steps in the analytical theory of non-neutral pair plasma stability.

We will also present the first steps towards the first numerical simulations of pair plasmas in a dipole geometry using the GENE code.