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Dynamic behaviour of the L-H transition in ASDEX-Upgrade

Authors
  • Zohm, H.
  • team, asdex-upgrade
  • Max-Planck-Institut fuer Plasmaphysik, G...
Publication Date
Jan 01, 1993
Source
OpenGrey Repository
Keywords
Language
English
License
Unknown

Abstract

The dynamic behaviour of the L-H transition in ASDEX-Upgrade is described. We focus on the periodic L-H-L transitions known as 'dithering H-mode' and show that there is an intrinsic timescale in this process which is characteristic for the L-H transition. We give a tentative explanation for the phenomenon using an extension of Itoh's model for the L-H transition and find that this simple bifurcation model can qualitatively explain many of the experimental observations. According to our model, the dithering cycles are a limit cycle oscillation due to a difference in the response of the system to a rise in either T or n. The implications for H-mode theories are discussed. (orig.) / SIGLE / Available from TIB Hannover: RA 71(1/276) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische Informationsbibliothek / DE / Germany

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