ELM-free stationary H-mode plasmas in the ASDEX Upgrade tokamak

Suttrop, W.; Maraschek, M.; Conway, G. D.; Fahrbach, H.-U.; Haas, G.; Horton, L. D.; Kurki-Suonio, T.; Lasnier, C. J.; Leonard, A. W.; Maggi, C. F.; Meister, H.; Mück, A.; Neu, R.; Nunes, I.; Pütterich, T.; Reich, M.; Sips, A. C. C.; ASDEX Upgrade Team

doi:10.1088/0741-3335/45/8/302

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ELM-free stationary H-mode plasmas in the ASDEX Upgrade tokamak

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Suttrop, W.
Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;

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Maraschek, M.
Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons108881

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

/persons/resource/persons109058

Fahrbach, H.-U.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109263

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

/persons/resource/persons109446

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

/persons/resource/persons109863

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

/persons/resource/persons109929

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

/persons/resource/persons110046

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

/persons/resource/persons110207

Pütterich, T.
Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110234

Reich, M.
Experimental Plasma Physics 1 (E1), 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;

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Citation

Suttrop, W., Maraschek, M., Conway, G. D., Fahrbach, H.-U., Haas, G., Horton, L. D., et al. (2003). ELM-free stationary H-mode plasmas in the ASDEX Upgrade tokamak. Plasma Physics and Controlled Fusion, 45, 1399-1416. doi:10.1088/0741-3335/45/8/302.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-2DC3-8

Abstract

ELM-free H-mode plasmas with stationary plasma density and radiation level are obtained in the ASDEX Upgrade tokamak with large clearance between the last closed flux surface and the wall, and neutral beam injection in a toroidal direction opposite to that of the plasma current. This behaviour is accompanied by a characteristic narrow-band magnetohydrodynamic (MHD) oscillation with clear harmonics up to n = 11 visible. This mode is localized in the plasma edge region. Conditions and properties of the stationary ELM-free phases and the edge MHD oscillation closely resemble that of the `quiescent H-mode' and the `edge harmonic oscillation' found in the DIII-D tokamak (Burrell K H et al 2002 Plasma Phys. Control. Fusion 44 A253). In addition, high-frequency MHD oscillations are found with an amplitude correlated with fluctuations of the divertor D intensity, suggesting a possible relevance of these modes for particle transport.