Micro-stability and transport modelling of internal transport barriers on JET

Garbet, X.; Baranov, Y.; Bateman, G.; Benkadda, S.; Beyer, P.; Crisanti, F.; Esposito, B.; Figarella, C.; Fourment, C.; Ghendrih, P.; Imbeaux, F.; Joffrin, E.; Kinsey, J.; Kritz, A.; Litaudon, X.; Maget, P.; Mantica, P.; Moreau, D.; Sarazin, Y.; Pankin, A.; Parail, V.; Peeters, A.; Tala, T.; Tardini, G.; Thyagaraja, A.; Voitsekhovitch, I.; Weiland, J.; Wolf, R.; JET EFDA Contributors,

doi:10.1088/0029-5515/43/9/323

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Micro-stability and transport modelling of internal transport barriers on JET

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Parail, V.
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

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

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Tardini, G.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

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Wolf, R.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Garbet, X., Baranov, Y., Bateman, G., Benkadda, S., Beyer, P., Crisanti, F., et al. (2003). Micro-stability and transport modelling of internal transport barriers on JET. Nuclear Fusion, 43(9), 975-981. doi:10.1088/0029-5515/43/9/323.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-2EBA-5

Abstract

The physics of internal transport barrier (ITB) formation in JET has been investigated using micro-stability analysis, profile modelling and turbulence simulations. The calculation of linear growth rates shows that magnetic shear plays a crucial role in the formation of the ITB. Shafranov shift, ratio of the ion to electron temperature, and impurity content further improve the stability. This picture is consistent with profile modelling and global fluid simulations of electrostatic drift waves. Turbulence simulations also show that rational q values may play a special role in triggering an ITB. The same physics also explains how double internal barriers can be formed.