We report on the observation of the self-excited dust density waves in the dc discharge complex plasma. The experiments were performed under microgravity conditions in the Plasmakristall-4 facility on board the International Space Station. In the experiment, the microparticle cloud was first trapped in an inductively coupled plasma and then released to drift for some seconds in a dc discharge with constant current. After that, the discharge polarity was reversed. DC plasma containing a drifting microparticle cloud was found to be strongly non-uniform in terms of microparticle drift velocity and plasma emission in accordance with [Zobnin et al., Phys. Plasmas 25, 033702 (2018)]. In addition to that, non-uniformity in the self-excited wave pattern was observed: In the front edge of the microparticle cloud (defined as head), the waves had larger phase velocity than in the rear edge (defined as tail). Also, after the polarity reversal, the wave pattern exhibited several bifurcations: Between each of the two old wave crests, a new wave crest has formed. These bifurcations, however, occurred only in the head of the microparticle cloud. We show that spatial variations of electric field inside the drifting cloud play an important role in the formation of the wave pattern. Comparison of the theoretical estimations and measurements demonstrate the significant impact of the electric field on the phase velocity of the wave. The same theoretical approach applied to the instability growth rate showed agreement between estimated and measured values.
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Dust density waves in a dc flowing complex plasma with discharge polarity reversal
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August 2018
Research Article|
August 07 2018
Dust density waves in a dc flowing complex plasma with discharge polarity reversal
S. Jaiswal;
S. Jaiswal
a)
1
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft-und Raumfahrt (DLR)
, 82234 Weßling, Germany
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M. Y. Pustylnik;
M. Y. Pustylnik
b)
1
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft-und Raumfahrt (DLR)
, 82234 Weßling, Germany
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S. Zhdanov;
S. Zhdanov
1
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft-und Raumfahrt (DLR)
, 82234 Weßling, Germany
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H. M. Thomas;
H. M. Thomas
1
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft-und Raumfahrt (DLR)
, 82234 Weßling, Germany
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A. M. Lipaev;
A. M. Lipaev
2
Joint Institute for High Temperatures, Russian Academy of Sciences
, 125412 Moscow, Russia
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A. D. Usachev;
A. D. Usachev
2
Joint Institute for High Temperatures, Russian Academy of Sciences
, 125412 Moscow, Russia
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V. I. Molotkov;
V. I. Molotkov
2
Joint Institute for High Temperatures, Russian Academy of Sciences
, 125412 Moscow, Russia
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V. E. Fortov;
V. E. Fortov
2
Joint Institute for High Temperatures, Russian Academy of Sciences
, 125412 Moscow, Russia
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M. H. Thoma;
M. H. Thoma
3
I. Physikalisches Institut, Justus-Liebig-Universität Gießen
, 35392 Gießen, Germany
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O. V. Novitskii
O. V. Novitskii
4
Gagarin Research and Test Cosmonaut Training Center
, 141160 Star City, Moscow Region, Russia
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a)
Present address: Physics Department, Auburn University, Auburn, AL 36849, USA.
b)
Electronic mail: mikhail.pustylnik@dlr.de
Phys. Plasmas 25, 083705 (2018)
Article history
Received:
May 17 2018
Accepted:
July 10 2018
Citation
S. Jaiswal, M. Y. Pustylnik, S. Zhdanov, H. M. Thomas, A. M. Lipaev, A. D. Usachev, V. I. Molotkov, V. E. Fortov, M. H. Thoma, O. V. Novitskii; Dust density waves in a dc flowing complex plasma with discharge polarity reversal. Phys. Plasmas 1 August 2018; 25 (8): 083705. https://doi.org/10.1063/1.5040417
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