Dynamic behaviour of the L-H transition
The dynamic behaviour of the L-H transition in the ASDEX-Upgrade tokamak is described. The periodic L-H-L transitions, known as dithering H-mode, are reported and it is shown that there is an intrinsic time scale in this process which is characteristic for the L-H transition. An explanation for the phenomenon is provided using an extension of Itoh's model. According to the 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.
Bibliographic Reference: Article: Physical Review Letters, Vol. 72 (1994) No. 2, pp. 222-225
Record Number: 199410501 / Last updated on: 1994-11-28
Original language: en
Available languages: en