guest ::
| Home > Publications database > Drift wave transport and origin of the disruption phenomenon : a theoretical model |
| Home > Publications database > Drift wave transport and origin of the disruption phenomenon : a theoretical model |
| Book/Report | FZJ-2018-02259 |
;
1983
Kernforschungsanlage Jülich, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/17958
Report No.: Juel-1830
Abstract: Nonlinear ion Landau damping of drift waves yields a splitting of the spectrum into a Jong and a short wavelengthbranch. The latter contributes most (> 90 %) of the transport and permits to explain the observed relaxation of Tokamak plasma profiles to a weakly unstable state, in the occurence with regard to the dissipative trapped eleetron mode. The fluxes indeed increase much more rapidly than the linear growth rates. This result and surprising coincidences between the linear theory and empirical laws concerning the high density limit lead us to propose that the slow riss of the sawtooth pulsations of the core occurs whilst the transport in the surrounding layer is insufficient to evacuate the power deposited. The sudden relaxation takes place once the released heat pulses are capable - much as in collisionless shock waves - of exciting the trapped electron mode to a sufficient level to ensure adequate transport. The model explains many experimental Features associated with these sawteeth as well as with the related plasma disruptions: contraction of the current channel, high density limit (both the scaling and the order of magnitude are predicted), etc . .
|
The record appears in these collections: |
PDF
PDF (PDFA)