DMCA
Double Internal Transport Barrier Triggering Mechanism (2003)
BibTeX
@MISC{Plasmas03doubleinternal,
author = {In Tokamak Plasmas and Dong Jiaqi and Mou Zongze and Long Yongxing and Mahajan Swadesh M},
title = {Double Internal Transport Barrier Triggering Mechanism},
year = {2003}
}
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Abstract
Sheared flow layers created by energy released in magnetic reconnection processes are studied with the magnetohydrodynamics (MHD), aimed at internal transport barrier (ITB) dynamics. The double tearing mode induced by electron viscosity is investigated and proposed as a triggering mechanism for double internal transport barrier (DITB) observed in tokamak plasmas with non-monotonic safety factor profiles. The quasi-linear development of the mode is simulated and the emphasis is placed on the structure of sheared poloidal flow layers formed in the vicinity of the magnetic islands. For viscosity double tearing modes, it is shown that the sheared flows induced by the mode may reach the level required by the condition for ITB formation. Especially, the flow layers are found to form just outside the magnetic islands. The scaling of the generated velocity with plasma parameters is given. Possible explanation for the experimental observations that the preferential formation of transport barriers in the proximity of low order rational surfaces is discussed. Keywords: internal transport barrier, double internal transport barrier, viscosity tearing mode, double tearing mode, sheared flow, rational surface 1.
Keyphrases
magnetic island double internal transport barrier internal transport barrier flow layer sheared poloidal flow layer itb formation generated velocity rational surface quasi-linear development non-monotonic safety factor profile low order rational surface sheared flow double tearing mode plasma parameter magnetic reconnection process experimental observation transport barrier tokamak plasma preferential formation possible explanation sheared flow layer electron viscosity
