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Turbulence at the transition to the high density H-mode in Wendelstein 7-AS plasmas

MPG-Autoren
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Bäumel,  S.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

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Endler,  M.
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;

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Hirsch,  M.
W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society;

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McCormick,  K.
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;
W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society;

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Werner,  A.
W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society;

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Zitation

Basse, N. P., Zoletnik, S., Bäumel, S., Endler, M., Hirsch, M., McCormick, K., et al. (2003). Turbulence at the transition to the high density H-mode in Wendelstein 7-AS plasmas. Nuclear Fusion, 43, 40-48.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0027-22FE-9
Zusammenfassung
Recently a new improved confinement regime was found in the Wendelstein 7-AS (W7-AS) stellarator (Renner H. et al 1989 Plasma Phys. Control. Fusion 31 1579). The discovery of this high density high confinement mode (HDH-mode) was facilitated by the installation of divertor modules. In this paper, measurements of short wavelength density fluctuations in the HDH-mode using collective scattering of infrared light are presented. These measurements will be contrasted to fluctuations during normal confinement operation (NC-mode). The autopower spectra of the measurements show a consistent increase of the fluctuation level associated with the transition from NC- to HDH-mode. Correlation calculations on a 20 mus timescale between magnetic and density fluctuations lead to the result that the fluctuations are correlated in NC- but not in HDH-mode. Finally, a comparative analysis between the enhanced D-alpha H-mode (EDA H-mode) found in the Alcator C-Mod tokamak and the HDH-mode in W7-AS is carried out.