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Transition from drift to interchange instabilities in an open magnetic field line configuration

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Poli, F. M. (Francesca), Ricci, P., Fasoli, A. and Podesta, M. (2008) Transition from drift to interchange instabilities in an open magnetic field line configuration. Physics of Plasmas, Vol.15 (No.3). Article No.032104. doi:10.1063/1.2899303

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Official URL: http://dx.doi.org/10.1063/1.2899303

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Abstract

The transition from a regime dominated by drift instabilities to a regime dominated by pure interchange instabilities is investigated and characterized in the simple magnetized toroidal device TORPEX [TORoidal Plasma EXperiment, A. Fasoli et al., Phys. of Plasmas 13, 055906 (2006)]. The magnetic field lines are helical, with a dominant toroidal component and a smaller vertical component. Instabilities with a drift character are observed in the favorable curvature region, on the high field side with respect to the maximum of the background density profile. For a limited range of values of the vertical field they coexist with interchange instabilities in the unfavorable curvature region, on the plasma low field side. With increasing vertical magnetic field magnitude, a gradual transition between the two regimes is observed on the low field side, controlled by the value of the field line connection length. The observed transition follows the predictions of a two-fluid linear model. (C) 2008 American Institute of Physics.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physics of Plasmas
Publisher: American Institute of Physics
ISSN: 1070-664X
Official Date: March 2008
Dates:
DateEvent
March 2008Published
Volume: Vol.15
Number: No.3
Number of Pages: 10
Page Range: Article No.032104
DOI: 10.1063/1.2899303
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

Data sourced from Thomson Reuters' Web of Knowledge

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