Collisional Multi-Ion Cross-Field Transport in Magnetized Plasma.
ORAL
Abstract
Impurity transport is important in a number of applications, including nuclear fusion and plasma mass filters. We find out that the presence of multiple ion species enables plasma to exhibit curious effects such as charge incompressibility, heat pump, and ion stratification when plasma is subjected to external forces or temperature gradient. [1,2] We show that the equilibrium state and the direction of impurity transport strongly depend on plasma magnetization, which is characterized by the ion Hall parameter. [3] Moreover, we find out that the Hall parameter of interest is the ratio of light ion gyrofrequency to collision frequency between light and heavy ion species. Finally, we show that multi-ion transport changes its nature in partially ionized plasma, where ions can be in different charge states. In particular, we find out that partially ionized plasma experiences much faster deconfinement than fully ionized plasma due to the fact that combined presence of cross-field transport, ionization, and recombination leads to net ion charge moving across magnetic field lines on ion-ion transport timescale as opposed to electron-ion transport timescale in the case of fully ionized plasma.
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Publication: [1] ``Strategies for advantageous differential transport of ions in magnetic fusion devices" E. J. Kolmes, I. E. Ochs, and N. J. Fisch, Phys. Plasmas 25, 032508 (2018).<br>[2] ``Heat pump via charge incompressibility in a collisional magnetized multi-ion plasma" M. E. Mlodik, E. J. Kolmes, I. E. Ochs, and N. J. Fisch, Phys. Rev. E 102, 013212 (2020)<br>[3] ``Generalized impurity pinch in partially magnetized multi-ion plasma" M. E. Mlodik, E. J. Kolmes, I. E. Ochs, and N. J. Fisch Phys. Plasmas 28, 052702 (2021)
