A systematic study of the quasi-coherent mode in the high density H-mode regime of wendelstein 7-AS

E. Belonohy, G. Pokol, K. McCormick, G. Papp, S. Zoletnik

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The High Density H-mode (HDH) is a highly promising ELM-free H-mode on the Wendelstein 7-AS (W7-AS) stellarator exhibiting no impurity accumulation. As future fusion-oriented stellarator devices need to run at high densities, a regime often susceptible to impurity accumulation in the standard H-modes of W7-AS, the HDH is of particular interest. The mechanism responsible for the reduced impurity concentration is still undetected and remains a central question in understanding this H-mode. Preliminary results are presented on a possible candidate, a Quasi-Coherent (QC) mode sometimes observed in the HDH regime. The properties of this mode, such as its frequency modulation, frequency and amplitude dependences are discussed as well as its universality with a viewpoint to its possible role in the HDH physics.

Original languageEnglish
Title of host publicationPlasma 2007 - Proceedings Intl. Conf. on Research and Applications of Plasmas
Subtitle of host publication4th German-Polish Conference on Plasma Diagnostics for Fusion and Applications
Pages39-42
Number of pages4
DOIs
Publication statusPublished - Apr 28 2008
EventInternational Conference PLASMA 2007 on Research and Applications of Plasmas: 4th German-Polish Conference on Plasma Diagnostics for Fusion and Applications - 6th French-Polish Seminar on Thermal Plasma in Space and Laboratory - Greifswald, Germany
Duration: Oct 16 2007Oct 19 2007

Publication series

NameAIP Conference Proceedings
Volume993
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherInternational Conference PLASMA 2007 on Research and Applications of Plasmas: 4th German-Polish Conference on Plasma Diagnostics for Fusion and Applications - 6th French-Polish Seminar on Thermal Plasma in Space and Laboratory
CountryGermany
CityGreifswald
Period10/16/0710/19/07

Keywords

  • Fusion plasma physics
  • H-mode
  • HDH-mode
  • Quasi-coherent mode
  • Stellarator
  • W7-AS

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'A systematic study of the quasi-coherent mode in the high density H-mode regime of wendelstein 7-AS'. Together they form a unique fingerprint.

  • Cite this

    Belonohy, E., Pokol, G., McCormick, K., Papp, G., & Zoletnik, S. (2008). A systematic study of the quasi-coherent mode in the high density H-mode regime of wendelstein 7-AS. In Plasma 2007 - Proceedings Intl. Conf. on Research and Applications of Plasmas: 4th German-Polish Conference on Plasma Diagnostics for Fusion and Applications (pp. 39-42). (AIP Conference Proceedings; Vol. 993). https://doi.org/10.1063/1.2909159