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Abstract
Transport barriers at the plasma edge are key elements of high confinement regimes in fusion devices. In typical configurations, such barriers are not stable but exhibit quasi-periodic relaxation oscillations. In the first part of this work, a one dimensional model for such relaxation oscillations is investigated. This model has been derived from three dimensional turbulence simulations in the presence of a transport barrier generated by an imposed shear flow. A proper orthogonal decomposition of the spatio-temporal behavior in this model then leads to a reduced set of ordinary equations for the amplitudes of the relevant modes. These modes are found to be different from linear eigenmodes. The zero dimensional model reproduces barrier oscillations. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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