Berlin 2005 – scientific programme

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DY: Dynamik und Statistische Physik

DY 30: Spiral Formation and Feedback

DY 30.5: Talk

Monday, March 7, 2005, 11:15–11:30, TU H3010

Latency effects in the feedback-mediated control of spiral waves — •Jan Schlesner, Vladimir Zykov, Harald Engel, and Eckehard Schöll — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

We propose several feedback schemes that allow to stabilize the regime of rigid rotation of spiral waves beyond the meander instability of the uncontrolled system. To study experimentally unavoidable latency effects in the control loop we determine the control domain in the parameter plane spanned by the feedback strength and the latency time. As expected with increasing latency time the control domain shrinks. The account of latency effects reveals an explanation of our recent experimental results obtained for rotating concentration waves in light-sensitive Belousov-Zhabotinsky media.