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Generation and dynamics of plasma blobs in partially ionized tokamak scrape-off-layer
Umeå University, Faculty of Science and Technology, Department of Physics. Institut für Theoretische Physik IV, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany; School of Physics, University of Kwazulu-Natal, Durban 4000, South Africa; Nonlinear Physics Centre & Centre for Plasma Science and Astrophysics, Ruhr-Universität Bochum, D-44780 Bochum, Germany; Max-Planck-Institut für Extraterrestrische Physik, D-85741 Garching, Germany; Grupo de Lasers e Plasmas, Departamento de Física do Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal; CCLRC Centre for Fundamental Physics, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon 0X11 0QX, UK; SUPA Department of Physics, University of Strathclyde, Glasgow G 40NG, UK.
2007 (English)In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 371, no 5-6, 453-456 p.Article in journal (Refereed) PublishedText
Abstract [en]

A theoretical model for the generation and dynamics of plasma blobs in a tokamak scrape-off-layer (SOL) is presented. Specifically, it is suggested that plasma blobs could be generated due to a resistive Rayleigh-Taylor (RRT) instability in partially ionized SOL plasmas that contain equilibrium density and magnetic field inhomogeneities. By using the two-fluid model, a set of nonlinear equations for the low-frequency (in comparison with the ion gyrofrequency) electrostatic modes involved in the RRT instability is derived. In the linear limit, a new dispersion relation is obtained, and analyzed in some limiting cases. The nonlinear equations are useful for studying the dynamics of nonlinearly interacting finite amplitude RRT modes, which are linearly excited due to combined action of ionization as well as of density and magnetic field inhomogeneities in partially ionized SOL plasmas.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2007. Vol. 371, no 5-6, 453-456 p.
Keyword [en]
Equatorial spread-F, convective cells, dusty plasmas, transport, driven, waves, modes
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:umu:diva-118182DOI: 10.1016/j.physleta.2007.06.054ISI: 000251595700017OAI: diva2:920658
Available from: 2016-04-18 Created: 2016-03-14 Last updated: 2016-04-18Bibliographically approved

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Shukla, Padma Kant
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