Interaction of an external rotating magnetic field with the tearing mode in a plasma surrounded by a resistive wall

Authors
Citation
Sc. Guo et Ms. Chu, Interaction of an external rotating magnetic field with the tearing mode in a plasma surrounded by a resistive wall, PHYS PLASMA, 8(7), 2001, pp. 3342-3355
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS OF PLASMAS
ISSN journal
1070-664X → ACNP
Volume
8
Issue
7
Year of publication
2001
Pages
3342 - 3355
Database
ISI
SICI code
1070-664X(200107)8:7<3342:IOAERM>2.0.ZU;2-M
Abstract
The nonlinear dynamics of a tearing mode interacting with an externally app lied rotating field and a resistive wall is studied. A pair of coupled equa tions describing the evolution of the amplitude and frequency of a single t earing mode is derived and used in this study. The equations are valid for both tokamaks and reversed field pinches (RFP). Numerical analysis is appli ed on the RFP configuration. Bifurcated stationary states of the tearing mo de are found. Transition between these stationary states is studied by time dependent integration. This investigation shows that the dynamics of the t earing mode is substantially affected by the external applied field. For ex ample, a tearing mode locked to the resistive wall can be unlocked to rotat e with the external field; the required amplitude and frequency of the exte rnal field are presented. Finally, the possibility of utilizing the externa l resonant magnetic field to enhance the amplitude of an unlocked single he licity state in the RFP is discussed. (C) 2001 American Institute of Physic s.