Operational range and transport barrier of the H-mode in the stellarator W7-AS

M. Hirsch, P. Amadeo, M. Anton, J. Baldzuhn, R. Brakel, J. Bleuel, S. Fiedler, T. Geist, P. Grigull, H. J. Hartfuß, E. Holzhauer, R. Jaenicke, M. Kick, J. Kisslinger, J. Koponen, F. Wagner, A. Weller, H. Wobig, S. Zoletnik

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

In W7-AS the H-mode is characterized by an edge transport barrier localized in the first 3-4 cm inside the separatrix. In the ELMy H-mode preceding the quiescent state ELMs appear as a sudden breakdown of the edge transport barrier in coincidence with bursts of fluctuations. Between ELMs fluctuations are identical to those of the quiescent H-mode. The operational range of the quiescent H-mode is determined by narrow windows of the edge rotational transform and a threshold edge electron density. In contrast, ELM-like events are observed for a variety of plasma conditions by far exceeding the narrow operational windows for the quiescent state.

Original languageEnglish
Pages (from-to)631-634
Number of pages4
JournalPlasma Physics and Controlled Fusion
Volume40
Issue number5
DOIs
Publication statusPublished - Dec 1 1998

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Operational range and transport barrier of the H-mode in the stellarator W7-AS'. Together they form a unique fingerprint.

  • Cite this

    Hirsch, M., Amadeo, P., Anton, M., Baldzuhn, J., Brakel, R., Bleuel, J., Fiedler, S., Geist, T., Grigull, P., Hartfuß, H. J., Holzhauer, E., Jaenicke, R., Kick, M., Kisslinger, J., Koponen, J., Wagner, F., Weller, A., Wobig, H., & Zoletnik, S. (1998). Operational range and transport barrier of the H-mode in the stellarator W7-AS. Plasma Physics and Controlled Fusion, 40(5), 631-634. https://doi.org/10.1088/0741-3335/40/5/012