Dynamics of resistive double tearing modes with broad linear spectra

Simple item page
dc.creatorBierwage, Andreas
dc.creatorBenkadda, Sadruddin
dc.creatorHamaguchi, Satoshi
dc.creatorWakatani, Masahiro
dc.date2006-09-12
dc.date2007-03-01
dc.date.accessioned2026-07-07T07:49:25Z
dc.date.available2026-07-07T07:49:25Z
dc.descriptionThe nonlinear evolution of resistive double tearing modes (DTMs) with safety factor values q=1 and q=3 is studied in a reduced cylindrical model of a tokamak plasma. We focus on cases where the resonant surfaces are a small distance apart. Recent numerical studies have shown that in such configurations high-m modes are strongly unstable. In this paper, it is first demonstrated that linear DTM theory predicts the dominance of high-m DTMs. A semi-empirical formula for estimating the poloidal mode number of the fastest growing mode, m_peak, is obtained from the existing linear theory. Second, using nonlinear simulations, it is shown that the presence of fast growing high-m modes leads to a rapid turbulent collapse in an annular region, whereby small magnetic island structures form. Furthermore, consideration is given to the evolution of low-m modes, in particular the global m=1 internal kink, which can undergo nonlinear driving through coupling to fast growing linear high-m DTMs. Factors influencing the details of the dynamics are discussed. These results may be relevant for the understanding of the magnetohydrodynamic (MHD) activity near the minimum of q and may thus be of interest to studies concerned with stability and confinement in advanced tokamaks.
dc.description11 pages, 10 figures
dc.identifierhttps://arxiv.org/abs/physics/0609102
dc.identifierhttp://arxiv.org/abs/physics/0609102
dc.identifierPhys. Plasmas 14, 022107 (2007)
dc.identifierdoi:10.1063/1.2446420
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/124840
dc.subjectPlasma Physics
dc.titleDynamics of resistive double tearing modes with broad linear spectra
dc.typetext

Files

Collections

arXiv