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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.94: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Local gyrokinetic stability theory of plasmas of arbitrary degree of neutrality — •Daniel Kennedy, Alexey Mishchenko, and Per Helander — Max-Planck-Institut fur plasmaphysik

Dipole (RT-1) and stellarator (CNT) geometries are capable of confining plasmas of arbitrary neutrality, ranging from pure electron plasmas through to quasineutral. The Diocotron mode is known to be important in non-neutral plasmas and has been widely studied. However, drift mode dynamics, dominating quasineutral plasmas, has received very little by way of attention in the non-neutral context. Here, we show that non-neutral plasmas can be unstable with respect to both density-gradient and temperature-gradient driven instabilities. A local shearless slab limit is considered for simplicity. A key feature of non-neutral plasmas is the development of strong electric fields, in this local limit, the effect of the corresponding ExB drift is limited to the Doppler shift of the complex frequency. However, the breaking of the quasineutrality condition still leads to interesting dynamics in non-neutral plasmas. In this paper we address the behaviour of a number of gyrokinetic modes in electron-ion and electron-positron plasmas with arbitrary degree of neutrality. We also examine the cross-field particle transport due to such modes.