Dust as probes: Determining confinement and interaction forces

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dc.contributor.authorHartmann, Peter
dc.contributor.authorRosenberg, Marlene
dc.contributor.authorJuhasz, Z.
dc.contributor.authorMatthews, Lorin
dc.contributor.authorSanford, Dustin
dc.contributor.authorVermillion, Katrina
dc.contributor.authorReyes, Jorge
dc.contributor.authorHyde, Truell
dc.date.accessioned2022-03-21T18:35:55Z
dc.date.available2022-03-21T18:35:55Z
dc.date.issued2020-10
dc.description.abstractThe PK-4 system is a micro-gravity dusty plasma experiment currently in operation on-board the International Space Station. The experiment utilizes a long DC discharge in neon or argon gases. We apply our 2D particle-in-cell with Monte Carlo collisions discharge simulation to compute local plasma parameters that serve as input data for future dust dynamics models. The simulation includes electrons, Ne+ ions, and Ne^m metastable atoms in neon gas and their collisions at solid surfaces including secondary electron emission and glass wall charging. On the time scale of the on-board optical imaging, the positive column appears stable and homogeneous. On the other hand, our simulations show that on microsecond time scales the positive column is highly inhomogeneous: ionization waves with phase velocities in the range between 500 m s−1 and 1200 m s−1 dominate the structure. In these waves, the electric field and charged particle densities can reach amplitudes up to 10 times of their average value. Our experiments on ground-based PK-4 replica systems fully support the numerical findings. In the experiment, the direction of the DC current can be alternated, which has been found to favor dust particle chain formation. We discuss possible mechanisms for how the highly oscillatory plasma environment contributes to the dust particle chain formation.en_US
dc.description.keywordsdusty plasmaen_US
dc.description.keywordsDC discharge plasmaen_US
dc.description.keywordsionization wavesen_US
dc.description.keywordsPIC modelen_US
dc.description.keywordsPK-4 experimenten_US
dc.identifier.citationPlasma Sources Science and Technology, 29(11), 115014, November 2020en_US
dc.identifier.doi10.1088/1361-6595/abb955
dc.identifier.urihttps://hdl.handle.net/2104/11773
dc.language.isoenen
dc.publisherIOP Publishingen_US
dc.titleDust as probes: Determining confinement and interaction forcesen_US
dc.typeArticleen

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