The dynamics of sawtooth phenomena in the Texas experimental Tokamak
Author : Joseph Allan Snipes
Publisher :
Page : 234 pages
File Size : 18,75 MB
Release : 1985
Category : Plasma oscillations
ISBN :
Author : Joseph Allan Snipes
Publisher :
Page : 234 pages
File Size : 18,75 MB
Release : 1985
Category : Plasma oscillations
ISBN :
Author :
Publisher :
Page : 578 pages
File Size : 29,60 MB
Release : 1993-10
Category : Power resources
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Author :
Publisher :
Page : 784 pages
File Size : 31,77 MB
Release : 1998
Category : Dissertation abstracts
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Author : Roger David Durst
Publisher :
Page : 284 pages
File Size : 10,19 MB
Release : 1988
Category : Tokamaks
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Author :
Publisher :
Page : 1288 pages
File Size : 45,41 MB
Release : 1993
Category : Physics
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Author :
Publisher :
Page : 141 pages
File Size : 30,21 MB
Release : 1998
Category :
ISBN :
The sawtooth crash is a hazardous, disruptive phenomenon that is observed in tokamaks whenever the safety factor at the magnetic axis is below unity. Recently, Tokamak Test Fusion Reactor (TFTR) experimental data has revealed interesting features of the dynamical pressure evolution during the crash phase. Motivated by the experimental results, this dissertation focuses on theoretical modeling of the finite pressure effects on the nonlinear stage of the sawtooth crash. The crash phase has been studied numerically employed a toroidal magnetohydrodynamic (MHD) initial value code deduced from the FAR code. For the first time, by starting from a concentric equilibrium, it has been shown that the evolution through an m/n = 1/1 magnetic island induces secondary high-n ballooning instabilities. The magnetic island evolution gives rise to convection of the pressure inside the inversion radius and builds up a steep pressure gradient across the island separatrix, or current sheet, and thereby triggers ballooning instabilities below the threshold for the axisymmetric equilibrium. Due to the onset of secondary ballooning modes, concomitant fine scale vortices and magnetic stochasticity are generated. These effects produce strong flows across the current sheet, and thereby significant modify the m = 1 driven magnetic reconnection process. The resultant interaction of the high-n ballooning modes with the magnetic reconnection process is discussed.
Author :
Publisher :
Page : 854 pages
File Size : 29,77 MB
Release : 2004
Category : Dissertations, Academic
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Author : William Arthur Craven
Publisher :
Page : 312 pages
File Size : 48,48 MB
Release : 1996
Category : Tokamaks
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Author :
Publisher :
Page : 962 pages
File Size : 23,50 MB
Release : 1988
Category : Nuclear energy
ISBN :
Author : Andrew Gaddy Meigs
Publisher :
Page : 550 pages
File Size : 21,31 MB
Release : 1993
Category : Tokamaks
ISBN :