Anomalous Ion Diffusion and Radial-Electric-Field Generation in a Turbulent Edge Plasma Potential Weakly Correlated in Time and Space

• Published in: Physica scripta Vol. 72; no. 4; pp. 327 - 332
• Main Authors: Pánek, R, Krlín, L, Tendler, M, Jr, D Tskhakaya, Kuhn, S, Svoboda, V, Klíma, R, Pavlo, P, Stöckel, J, Petržílka, V
• Format: Journal Article
• Language: English
• Published: IOP Publishing 2005
• Subjects: electrostatic turbulence; scrape-off layer; transport
• ISSN: 1402-4896; 0031-8949; 1402-4896
• DOI: 10.1238/Physica.Regular.072a00327

Using a simple model of tokamak-edge-plasma turbulence in the form of a spatially periodic and time-independent electrostatic potential, we have found recently a new type of anomalous impurity diffusion in this regime [1], [2]. In the present contribution, we estimate this diffusion in the test-particle approach for a real turbulent potential obtained in an experiment. A significant difference in the impurity dynannics between the Hamiltonian and drift approaches is observed. As an interesting consequence of these dynamics, the possibility of radial-electric-field generation in the turbulence regimes appears. This effect can be of importance in scenarios related to transport barriers.