Dynamics of low-intermediate-high-confinement transitions in toroidal plasmas.
Phys Rev Lett
; 110(26): 265002, 2013 Jun 28.
Article
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| MEDLINE
| ID: mdl-23848884
ABSTRACT
The dynamic features of the low-intermediate-high-(L-I-H) confinement transitions on HL-2A tokamak are presented. Here we report the discovery of two types of limit cycles (dubbed type-Y and type-J), which show opposite temporal ordering between the radial electric field and turbulence intensity. In type-Y, which appears first after an L-I transition, the turbulence grows first, followed by the localized electric field. In contrast, the electric field leads type-J. The turbulence-induced zonal flow and pressure-gradient-induced drift play essential roles in the two types of limit cycles, respectively. The condition of transition between types-Y and -J is studied in terms of the normalized radial electric field. An I-H transition is demonstrated to occur only from type-J.
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2013
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Article