Erlangen 2018 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 8: Complex Plasmas and Dusty Plasmas I

P 8.5: Vortrag

Dienstag, 6. März 2018, 11:55–12:10, KI 1.174

effect of discharge polarity reversal on the wave propagation in flowing complex plasma under microgravity condition — •Surabhi Jaiswal, Mikhail Pustylnik, and Sergey Zhdanov — DLR, oberpfaffenhofen, Germany

We presented an experimental investigation of effect of discharge polarity reversal on the wave structure generated in a flowing complex plasma at lower pressure. Experiment has been performed under microgravity conditions on board the International Space Station by using PK-4 facility, which ensured particle levitation inside the chamber up to desired volume. On changing the polarity, direction of dust cloud as a whole has been reverse however direction of associated wave structure remain unchanged with a small shift in the trajectory during polarity reversal. Generation of new crest in between the existing crest and merging of wave crest have been observed. Hilbert transform technique is used to understand the local variation of frequency, wave number and velocity of the crest. A model has been developed to understand the appearance of additional crest and variation in phase speed.