Dynamic behavior of theL-Htransition
- 10 January 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 72 (2) , 222-225
- https://doi.org/10.1103/physrevlett.72.222
Abstract
The dynamic behavior of the L-H transition in the ASDEX-Upgrade tokamak is described. We focus on the periodic L-H-L transitions known as ‘‘dithering H mode’’ and show that there is an intrinsic time scale 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.Keywords
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