Filament velocity scaling laws for warm ions

P. Manz, D. Carralero, G. Birkenmeier, H. W. Müller, S. H. Müller, G. Fuchert, B. D. Scott, U. Stroth

Research output: Contribution to journalArticlepeer-review

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The dynamics of filaments or blobs in the scrape-off layer of magnetic fusion devices are studied by magnitude estimates of a comprehensive drift-interchange-Alfvén fluid model. The standard blob models are reproduced in the cold ion case. Even though usually neglected, in the scrape-off layer, the ion temperature can exceed the electron temperature by an order of magnitude. The ion pressure affects the dynamics of filaments amongst others by adding up to the interchange drive and the polarisation current. It is shown how both effects modify the scaling laws for filament velocity in dependence of its size. Simplifications for experimentally relevant limit regimes are given. These are the sheath dissipation, collisional, and electromagnetic regime.

Original languageEnglish
Article number102307
JournalPhysics of Plasmas
Issue number10
StatePublished - Oct 2013


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