Jena 2013 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Poster: Niedertemperaturplasmen
P 11.7: Poster
Mittwoch, 27. Februar 2013, 16:30–18:30, Poster EG
Expanding Structures in Unmagnetized Plasmas — •Timo Schröder1, Olaf Grulke1, Thomas Klinger1,2, Rod Boswell3, and Christine Charles3 — 1MPI f. Plasmaphysik, EURATOM Association, Greifswald — 2E.-M.-A. U., Greifswald — 3ANU, Canberra
A double layer (DL) is a localized boundary layer between two plasma regimes of significantly different plasma potential, ΔΦ > kBTe/e. Stationary DLs are commonly observed due to expanding plasmas and have been under investigation for decades. However, they can also be observed as propagating structures, e.g. during a shock-like plasma expansion into a low density ambient plasma. Propagating DL structures bear two channels of particle energy redistribution. Firstly, they effect the particles by acceleration in their electric field and secondly by Fermi acceleration due to their propagation velocity. The influence of the resulting fast particles on the DL electric field and propagation is not yet fully understood. Using 1D-PIC simulation and experiment, the spatio temporal evolution of plasma potential, plasma density, and the ion energy distribution is investigated and provides evidence of the existence of a supersonic ion population.