shear suppression of turbulence in diverted H-mode plasmas; role of edge magnetic shear
نویسندگان
چکیده
s. We show that strong edge magnetic shear which is generic to divertor plasmas makes the shearing of turbulence eddys in toroidal geometry more effective. From calculations of the shearing rates for KSTAR edge parameters, we conclude that the enhanced magnetic shear at the diverted KSTAR plasma edge facilitates shear suppression of turbulence and ensuing H-mode transition.
منابع مشابه
Physics of Turbulence Control and Transport Barrier Formation in Diii-d*
This paper describes the physical mechanisms responsible for turbulence control and transport barrier formation on DIII–D as determined from a synthesis of results from different enhanced confinement regimes, including quantitative and qualitative comparisons to theory. A wide range of DIII–D data support the hypothesis that a single underlying physical mechanism, turbulence suppression via ExB...
متن کاملOne-dimensional modelling of limit-cycle oscillation and H-mode power scaling
To understand the connection between the dynamics of microscopic turbulence and the macroscale power scaling in the L–I–H transition in magnetically confined plasmas, a new time-dependent, one-dimensional (in radius) model has been developed. The model investigates the radial force balance equation at the edge region of the plasma and applies the quenching effect of turbulence via the E × B flo...
متن کاملCoherent structures, intermittent turbulence, and dissipation in high- temperature plasmas
Related Articles Residual turbulence from velocity shear stabilized interchange instabilities Phys. Plasmas 20, 012301 (2013) Freely decaying turbulence in two-dimensional electrostatic gyrokinetics Phys. Plasmas 19, 122305 (2012) Magnetic turbulence suppression by a helical mode in a cylindrical geometry Phys. Plasmas 19, 122304 (2012) Effect of secondary convective cells on turbulence intensi...
متن کاملPotential Fluctuation Associated with Energetic-Particle Induced Geodesic Acoustic Mode in Reversed Magnetic Shear Plasmas on LHD
Geodesic acoustic mode(GAM) driven by energetic particles are observed in the Large Helical Device by a heavy ion beam probe. The GAM frequency shifts upward in plasmas with monotonic magnetic shear. In plasmas with reversed magnetic shear, on the other hand, the observed GAM and the energetic-particle induced mode, which is probably reversed-shear induced Alfvén Eigenmode(RSAE), appears, and t...
متن کاملREVIEW ARTICLES Effects of E3B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices*
One of the scientific success stories of fusion research over the past decade is the development of the E3B shear stabilization model to explain the formation of transport barriers in magnetic confinement devices. This model was originally developed to explain the transport barrier formed at the plasma edge in tokamaks after the L ~low! to H ~high! transition. This concept has the universality ...
متن کامل