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Onset of turbulence in an autooscillating complex plasma

Schwabe, Mierk and Zhdanov, Sergey and Räth, Christoph (2017) Onset of turbulence in an autooscillating complex plasma. International Conference on the Physics of Dusty Plasmas, 2017-05-20 - 2017-05-25, Prag, Tschechien.

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Turbulence is one of the last unresolved issues of modern theoretical physics. In conventional experiments on turbulence, the carriers of the interaction are not directly observable. Instead, typically tracer particles are used - a method that might not produce reliable results [1]. Here, we present an experiment performed in the PK-3 Plus Laboratory on board the International Space Station [2] which allows investigating the fundamental particles in turbulence directly. First, the complex plasma cloud was stabilized with an alternating electric field. Once the stabilization was switched off, a heartbeat instability developed, and the microparticles started oscillating radially. We show that the kinetic energy spectra develop a double cascade once the cloud becomes unstable, see Figure 1. This double cascade has been predicted by Kraichnan [3] and Leith [4] for forced two-dimensional turbulence, but has only seldomly been observed in experiments [5]. We also show that the reduced rates of energy and enstrophy transfer can be used to infer the excitation wave number kexc, in good agreement with kexc obtained from the energy spectrum. [1] V. Mathai et al. Phys. Rev. Lett. 117, 024501 (2016). [2] H. M. Thomas et al. New J. Phys. 10, 033036 (2008). [3] R. H. Kraichnan. Phys. Fluids 10, 1417 (1967). [4] C. E. Leith. Phys. Fluids 11, 671 (1968). [5] G. Boffetta and R. E. Ecke. Ann. Rev. Fluid Mech. 44, 427{451 (2012)

Item URL in elib:https://elib.dlr.de/112697/
Document Type:Conference or Workshop Item (Speech)
Title:Onset of turbulence in an autooscillating complex plasma
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schwabe, MierkUNSPECIFIEDhttps://orcid.org/0000-0001-6565-5890UNSPECIFIED
Date:May 2017
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:komplexes Plasma, staubiges Plasma, Turbulenz, Instabilität
Event Title:International Conference on the Physics of Dusty Plasmas
Event Location:Prag, Tschechien
Event Type:international Conference
Event Start Date:20 May 2017
Event End Date:25 May 2017
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Komplexe Plasmen / Zero gravity (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Schwabe, Dr. Mierk
Deposited On:19 Jun 2017 08:45
Last Modified:24 Apr 2024 20:17

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