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

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.

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 Creators:
Basse, N. P., Author
Zoletnik, S., Author
Bäumel, S.1, Author           
Endler, M.2, Author           
Hirsch, M.3, Author           
McCormick, K.2, 4, Author           
Werner, A.3, Author           
Affiliations:
1Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
2Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856285              
3W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
4W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856310              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 15589
ISI: 000180953100005
 Degree: -

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Title: Nuclear Fusion
  Alternative Title : Nucl. Fusion
Source Genre: Journal
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Pages: - Volume / Issue: 43 Sequence Number: - Start / End Page: 40 - 48 Identifier: ISSN: 0029-5515