Bremen 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 3: Dusty Plasmas I

P 3.3: Vortrag

Montag, 13. März 2017, 14:55–15:10, HS 1010

Fine structure of a Mach cone in a zero gravity, 3d complex plasma system — •Erich Zaehringer, Mierk Schwabe, Sergey Zhdanov, Christina A. Knapek, Daniel P. Mohr, Peter Huber, and Hubertus M. Thomas — DLR German Aerospace Center, Research Group Complex Plasmas, Wessling, Germany

For a Complex Plasma, small micrometer sized particles are injected into a low temperature plasma, consisting of electrons, ions and neutral gas. Particles are getting charged by electrons and ion fluxes on their surfaces. These particles form a system with gaseous, liquid and solid properties out of several thousand charged particles. The single particle dynamics can be recorded in direct measurements due to the large size of 1 - 10 µm. Additional to measurements on plasma conditions and the particle system itself, extra particles can generate a lot of extra information about the complex plasma system.
A probe particle with supersonic speed was observed during a zero gravity experiment in the Zyflex chamber of the PlasmaLab / EkoPlasma project, generating a fine structured Mach cone in the 3D complex plasma system. Based on that, a profile of the acoustic velocity across the cloud could be generated and perturbations were analysed. The high resolution of the data offers the application of PTV and PIV methods to measure densities, velocities and displacements, and to characterize the super-sonic motion.
This work and some of the authors are funded by DLR/BMWi (FKZ 50WM1441).