Role of zonal flow predator-prey oscillations in triggering the transition to H-mode confinement |
| |
| Authors: | Schmitz L Zeng L Rhodes T L Hillesheim J C Doyle E J Groebner R J Peebles W A Burrell K H Wang G |
| |
| Institution: | University of California-Los Angeles, Los Angeles, California 90095, USA. |
| |
| Abstract: | Direct evidence of zonal flow (ZF) predator-prey oscillations and the synergistic roles of ZF- and equilibrium E×B flow shear in triggering the low- to high-confinement (L- to H-mode) transition in the DIII-D tokamak is presented. Periodic turbulence suppression is first observed in a narrow layer at and just inside the separatrix when the shearing rate transiently exceeds the turbulence decorrelation rate. The final transition to H mode with sustained turbulence and transport reduction is controlled by equilibrium E×B shear due to the increasing ion pressure gradient. |
| |
| Keywords: | |
| 本文献已被 PubMed 等数据库收录！ |
