Dresden 2006 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.46: Poster

Donnerstag, 30. März 2006, 16:00–18:00, P1

Instabilities of spiral wave drift induced by a line–detector feedback — •Jan Schlesner, Vladimir Zykov, and Harald Engel — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

Our experimental and numerical data show that a line–detector feedback can be efficiently used to induce a well-controlled spiral wave drift trough an excitable medium. To this aim a short excitability perturbation is applied globally each time a spiral wave front is tangent to the detector. However, the drift velocity is limited by instabilities which appear under high perturbation strengths or large time–delays in the feedback loop. A theory is developed that describes the spiral wave drift by a high–order iterative map, where the instabilities appear due to a Neimark bifurcation. Possible ways to suppress these instabilities are discussed.