Abstract
In a streaming plasma, negatively charged dust particles create complex charge distributions on the downstream side of the particle, which are responsible for attractive forces between the like-charged particles. This wake phenomenon is studied by means of refined linear response theory and molecular dynamics simulations as well as in experiments. Particular attention is paid to non-Maxwellian velocity distributions that are found in the plasma sheath and to situations with strong magnetic fields, which are becoming increasingly important. Non-Maxwellian distributions and strong magnetic fields result in a substantial damping of the oscillatory wake potential. The interaction force in particle pairs is explored with the phase-resolved resonance method, which demonstrates the non-reciprocity of the interparticle forces in unmagnetized and magnetized systems.
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Contribution to the Topical Issue “Fundamentals of Complex Plasmas”, edited by Jürgen Meichsner, Michael Bonitz, Holger Fehske, Alexander Piel.
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Ludwig, P., Jung, H., Kählert, H. et al. Non-Maxwellian and magnetic field effects in complex plasma wakes. Eur. Phys. J. D 72, 82 (2018). https://doi.org/10.1140/epjd/e2017-80413-2
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DOI: https://doi.org/10.1140/epjd/e2017-80413-2