Observation of the L-H confinement bifurcation triggered by a turbulence-driven shear flow in a tokamak plasma.
Phys Rev Lett
; 112(12): 125002, 2014 Mar 28.
Article
em En
| MEDLINE
| ID: mdl-24724655
ABSTRACT
Comprehensive 2D turbulence and eddy flow velocity measurements on DIII-D demonstrate a rapidly increasing turbulence-driven shear flow that develops â¼100 µs prior to the low-confinement (L mode) to high-confinement (H mode) transition and appears to trigger it. These changes are localized to a narrow layer 1-2 cm inside the magnetic boundary. Increasing heating power increases the Reynolds stress, the energy transfer from turbulence to the poloidal flow, and the edge flow shearing rate that then exceeds the decorrelation rate, suppressing turbulence and triggering the transition.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2014
Tipo de documento:
Article
País de afiliação:
Estados Unidos