Seminář ÚFE: doc. Mgr. Tomáš Hoder, Ph.D.

Zveme Vás na přednášku doc. Tomáše Hodera, Ph.D. na téma "Memory propagation in barrier discharge at water interface: suspected Markov states and spatiotemporal memory effects"

Abstrakt:

Barrier discharges are known for strong memory effects which shape their stochastic properties. After short introduction into the problematics of memory effects in plasmas and gas discharges in general, we will present our study on memory propagation in a surface barrier discharge operated at the water interface.

In the study, comprehensive electrical current data sets of seemingly chaotic behaviour are evaluated from thousands of subsequent periods recorded with high temporal resolution and large dynamic range. We confirm known memory effects and identify new ones both in between the half-periods as well as between subsequent pulses within one half-period. We find two states unaffected by any proven memory effect for the first discharges in the positive polarity which are defined by the presence/absence of photoemission-induced collective behaviour. Given the determined probability for entering one of these two suspected Markov states, the system bifurcates and follows one of the two subsequent clearly non-Markovian pathways.

The identification of the collective behaviour in these pathways enables us to recognize the spatially resolved property of the system and to determine its probability of occurrence both solely from the zero-dimensional electrical characterisation.