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Abstract

In the limit where the electron drift-wave frequency exceeds the electron-ion collision frequency, drift-tearing modes are found to grow with a linear growth rate independent of resistivity and proportional to the product of the electron inertial skin depth and the ion sound Larmor radius. The stabilisation of these modes in collisionless and semi-collisional regimes is investigated. The stabilisation mechanism is related to the coupling and propagation of drift-acoustic perturbations away from the reconnecting mode-rational surface. Analytic and numerical solutions of the four-field reduced fluid model in the slab geometry approximation with constant electron temperature and negligible ion temperature are presented. The actual stability threshold can occur at values of the normalised tearing mode stability parameter Delta' as high as 10{2}.

Additional information

Authors: GRASSO D, Istituto Nazionale Fisica della Materia, Dipartimento di Energetica, Politecnico di Torino (IT);PORCELLI F, Istituto Nazionale Fisica della Materia, Dipartimento di Energetica, Politecnico di Torino (IT);OTTAVIANI M, Association Euratom-CEA sur la Fusion, CEA/DSM/DRFC, CEA-Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Nuclear Fusion 42 (September 2002) 1067-1074
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://stacks.iop.org/0029-5515/42/1067
Record Number: 200215621 / Last updated on: 2002-12-02
Category: PUBLICATION
Original language: en
Available languages: en