Book/Report

FZJ-2018-03066

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png On the two time scales of the sawteeth precursors

Rogister, A.FZJ* ; Singh, R.FZJ*

1988
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/18592

Report No.: Juel-2238

Abstract: For current profiles with a slope discontinuity at $\epsilon_{2}$ close to $\epsilon_{1}$ [q($\epsilon_{1}$) = 1] and a small shear $\widehat{s}$ ($\epsilon_{1}$), the jump of the derivative of the magnetohydrodynamic (MHD) solution across the singular q=1 layer is of the form [$\psi$']$_{\epsilon_{1}}$ $\varpropto$ $\widehat{s}$$_{1}$ [1 - 4f($\mu$) $\epsilon^{2}_{1}$ / $\widehat{s}^{2}_{1}$]; $\epsilon$ is the finite inverse aspect ratio; $\mu \equiv \widehat{s}_{1} \epsilon_{1}/8 (\epsilon_{2} - \epsilon_{1})$ measures the ratio of the two small parameters. The growth rate of the sawtooth trigger can accordingly pass fromresistive to MHD values for slight variations either of $\widehat{s}_{1}$ or of ($\epsilon_{2} - \epsilon_{1}$)/$\epsilon_{1}$. The above profile properties have been observed in sawtoothing TEXTOR discharges.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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Database coverage:

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