Transverse ionization instability of the elongated dust cloud in the gas discharge uniform positive column under microgravity conditions

31st International Conference on Equations of State for Matter

Zobnin, A.V.^1 ; Usachev, A.D.^1 ; Lipaev, A.M.^1 ; Petrov, O.F.^1 ; Fortov, V.E.^1 ; Pustylnik, M.Yu.^2 ; Thomas, H.M.^2 ; Fink, M.A.^2 ; Thoma, M.H.^4 ; Padalka, G.I.^3

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13 Bldg 2, Moscow

125412, Russia^1

Research Group for Complex Plasmas, German Aerospace Center, Miinchener Straße 20, Weßling

82234, Germany^2

Yuri Gagarin Cosmonaut Training Center, Moscow Region, Star City

141160, Russia^3

I. Physikalisches Institut, Justus-Liebig-Universität Giefien, Heinrich-Buff-Ring 16, Gießen

35392, Germany^4

关键词: Inner diameters;    International Space stations;    Ionization instability;    Microgravity conditions;    Peak to peak amplitudes;    Polarity switching;    Positive column;    Space experiments;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012174/pdf
DOI  :  10.1088/1742-6596/774/1/012174

来源: IOP

【 摘 要 】

A new kind of dusty plasma instability was observed in the joint Russian-European "Plasma Kristall-4" space experiment on board of the International Space Station. An elongated cylindrical dust particle cloud of 0.9 cm diameter with a length of 20 cm was formed in the uniform positive column of a dc discharge operating in a polarity switching mode (dc/ps-mode). The discharge was operated in a glass tube of 3 cm inner diameter with a total length of 85 cm filled by argon at a pressure of 0.5 mbar. The dc/ps discharge was operated at 1 mA with a polarity switching frequency of 500 Hz. During the experiment, all the dust particles vibrated synchronized in the same phase in the direction perpendicular to the tube axis with a frequency of 24 Hz and peak-to-peak amplitude of 0.2 mm. The vibration was attended by discharge glow fluctuation. The nature of the cloud vibration is discussed.