Dependence of particle transport on the heating profile in ASDEX Upgrade

Stober, J.; Dux, R.; Gruber, O.; Horton, L.; Maggi, C.; Meo, F.; Neu, R.; Noterdaeme, J.-M.; Lang, P. T.; Lorenzini, R.; Peeters, A.; Pereverzev, G.; Ryter, F.; Sips, A. C. C.; Stäbler, A.; Zohm, H.; ASDEX Upgrade Team,

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Dependence of particle transport on the heating profile in ASDEX Upgrade

MPG-Autoren

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Stober, J.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons108992

Dux, R.
Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109241

Gruber, O.
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109446

Horton, L.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109863

Maggi, C.
Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society;

Meo, F.
Max Planck Society;

/persons/resource/persons110046

Neu, R.
Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110070

Noterdaeme, J.-M.
Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109762

Lang, P. T.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110124

Peeters, A.
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110134

Pereverzev, G.
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110299

Ryter, F.
Tokamak Edge and Divertor Physics (E2), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110520

Sips, A. C. C.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110551

Stäbler, A.
Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110907

Zohm, H.
Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;

ASDEX Upgrade Team,
Max Planck Society;

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Zitation

Stober, J., Dux, R., Gruber, O., Horton, L., Maggi, C., Meo, F., et al. (2003). Dependence of particle transport on the heating profile in ASDEX Upgrade. In Fusion Energy 2002. Vienna: International Atomic Energy Agency.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0027-3B6A-B

Zusammenfassung

The slow peaking of the density profile for high densities with moderate NBI and its disappearance with central ICRH have been reported at the last IAEA conference in Sorrento. Meanwhile a modell asumming D = 0.1 - - 0.15 χ_eff and the Ware-pinch has been used successfully to describe the data. Independently we have proven that the peaking is not due to differences of particle fuelling, since off-axis ICRH also leads to peaked density profiles. With the modification of treating the neoclassical ion-heat-flux separately the model holds also for discharges with lower plasma current and even for the density decay after pellet fuelling. The model is also related to the ECRH density pump-out. The separation of electron and ion chanel at low densities will be addressed. Central heating also increases the anomalous diffusivity of impurity ions which is beneficial for a fusion rector. Also Neoclassical Tearing Modes are more stable with central heating due to the flattening of the density profiles in accordance with the theoretical predictions for the dependence of the bootstrap current on the density gradient.