Tunable Fermi acceleration in the driven elliptical billiard

We explore the dynamical evolution of an ensemble of non-interacting particles propagating freely in an elliptical billiard with harmonically driven boundaries. The existence of Fermi acceleration is shown thereby refuting the established assumption that smoothly driven billiards whose static counte...

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Bibliographic Details
Published in:arXiv.org 2008-01
Main Authors: Lenz, Florian, Diakonos, Fotis K, Schmelcher, Peter
Format: Article
Language:English
Subjects:
Acceleration
Angular momentum
Angular velocity
Boundaries
Parameter identification
Process parameters
Online Access:Get full text
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Summary:We explore the dynamical evolution of an ensemble of non-interacting particles propagating freely in an elliptical billiard with harmonically driven boundaries. The existence of Fermi acceleration is shown thereby refuting the established assumption that smoothly driven billiards whose static counterparts are integrable do not exhibit acceleration dynamics. The underlying mechanism based on intermittent phases of laminar and stochastic behavior of the strongly correlated angular momentum and velocity motion is identified and studied with varying parameters. The diffusion process in velocity space is shown to be anomalous and we find that the corresponding characteristic exponent depends monotonically on the breathing amplitude of the billiard boundaries. Thus it is possible to tune the acceleration law in a straightforwardly controllable manner.
ISSN:2331-8422
DOI:10.48550/arxiv.0801.0641