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2014•Max Planck Digital LibraryOpen access

Pedestal properties of mitigated ELMy H-modes at high density at ASDEX Upgrade

E. Wolfrum, M. Wiesinger, M. Dunne, R. Fischer, P. Mänz, P. A. Schneider, W. Suttrop

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Abstract

The application of magnetic perturbations (MP) via coils mounted inside the vessel can lead to mitigated ELMs.At ASDEX Upgrade mitigation of ELMs is reliably achieved at high line averaged electron densities in the pedestal ( 𝑛 𝑒 ��� > 0.65 n GW ) [1,2].Without MPs, however, small ELMs also appear with sufficient fuelling.In this work the pedestal top properties of discharges featuring mitigated ELMs with and without application of MPs are compared.It will be shown that the pedestal top conditions, at which the small, mitigated ELMs appear, are the same with and without the application of MP coils.In addition, high power discharges with mitigated ELMs are analysed.

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The application of magnetic perturbations (MP) via coils mounted inside the vessel can lead to mitigated ELMs.At ASDEX Upgrade mitigation of ELMs is reliably achieved at high line averaged electron densities in the pedestal ( 𝑛 𝑒 ��� > 0.65 n GW ) [1,2].Without MPs, however, small ELMs also appear with sufficient fuelling.In this work the pedestal top properties of discharges featuring mitigated ELMs with and without application of MPs are compared.It will be shown that the pedestal top conditions, at which the small, mitigated ELMs appear, are the same with and without the application of MP coils.In addition, high power discharges with mitigated ELMs are analysed.

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Available abstract

The application of magnetic perturbations (MP) via coils mounted inside the vessel can lead to mitigated ELMs.At ASDEX Upgrade mitigation of ELMs is reliably achieved at high line averaged electron densities in the pedestal ( 𝑛 𝑒 ��� > 0.65 n GW ) [1,2].Without MPs, however, small ELMs also appear with sufficient fuelling.In this work the pedestal top properties of discharges featuring mitigated ELMs with and without application of MPs are compared.It will be shown that the pedestal top conditions, at which the small, mitigated ELMs appear, are the same with and without the application of MP coils.In addition, high power discharges with mitigated ELMs are analysed.

Key concepts: ASDEX Upgrade, Pedestal, Materials science, Tokamak, Plasma, Nuclear engineering, Physics, Nuclear physics

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