Record link: 
http://hdl.handle.net/20.500.12708/149980
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Title: 
Magnetic structure and frequency scaling of limit-cycle oscillations close to L- to H-mode transitions
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Citation: 
Birkenmeier, G., Cavedon, M., Conway, G. D., Manz, P., Stroth, U., Fischer, R., Fuchert, G., Happel, T., Laggner, F., Maraschek, M., Medvedeva, A., Nikolaeva, V., Prisiazhniuk, D., Pütterich, T., Ryter, F., Shao, L. M., Willensdorfer, M., Wolfrum, E., & Zohm, H. (2016). Magnetic structure and frequency scaling of limit-cycle oscillations close to L- to H-mode transitions. Nuclear Fusion, 56(8), 086009. https://doi.org/10.1088/0029-5515/56/8/086009
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Publisher DOI: 
10.1088/0029-5515/56/8/086009
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Publication Type: 
Article - Original Research Article
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Language: 
English
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Authors: 
Birkenmeier, G. 
Cavedon, M. 
Conway, G.D. 
Manz, P. 
Stroth, U. 
Fischer, R. 
Fuchert, G. 
Happel, T. 
Laggner, Florian 
Maraschek, M. 
Medvedeva, A. 
Nikolaeva, V. 
Prisiazhniuk, D. 
Pütterich, T. 
Ryter, F. 
Shao, L.M. 
Willensdorfer, Matthias 
Wolfrum, Elisabeth 
Zohm, H. 
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Organisational Unit: 
E134-03 - Forschungsbereich Atomic and Plasma Physics 
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Journal: 
Nuclear Fusion 
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ISSN: 
0029-5515
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Date (published): 
2016
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Number of Pages: 
7740825
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Publisher: 
IOP PUBLISHING LTD
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Peer reviewed: 
Yes
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Keywords: 
Condensed Matter Physics; Nuclear and High Energy Physics; pedestal; magnetic confinement; L-H transition; edge localized modes; high confinement mode; limit-cycle oscillations
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Abstract: 
Limit-cycle oscillations (LCOs) close to the power threshold of L- to H-mode transitions are investigated in plasmas of ASDEX Upgrade. During this phase, referred to as I-phase, a strong magnetic activity in the poloidal magnetic field B˙ with an up-down asymmetry is found. In some cases, the regular LCOs during I-phase transition smoothly into a phase with intermittent bursts which have similar properties to type-III edge localised modes (ELMs). Indications of precursors during the intermittent phase as well as in the regular LCO phase point to a common nature of the I-phase and type-III ELMs. The LCO frequency measured in a set of discharges with different plasma currents and magnetic fields scales as f Bt I nT 1 2 p 3 2 ( / / )/( ).
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Research Areas: 
Materials Characterization: 100%
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Science Branch: 
Physik, Astronomie
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