Results 61 to 70 of about 1,666,833 (84)

Neoclassical toroidal plasma viscosity with effects of finite banana width for finite aspect ratio tokamaks

Physics of Plasmas, 2016
Theory for neoclassical toroidal plasma viscosity has been developed to model transport phenomena, especially, toroidal plasma rotation for tokamaks with broken symmetry. Theoretical predictions are in agreement with the results of the numerical codes in the large aspect ratio limit.
K C Shaing
exaly   +2 more sources

Collisional boundary layer analysis for neoclassical toroidal plasma viscosity in tokamaks

Physics of Plasmas, 2008
It is demonstrated that the pitch angle integrals in the transport fluxes in the ν regime calculated in K. C. Shang [Phys. Plasmas 10, 1443 (2003)] are divergent as the trapped-circulating boundary is approached. Here, ν is the collision frequency. The origin of this divergence results from the logarithmic dependence in the bounce averaged radial drift
S A Sabbagh, J -K Park, P Cahyna
exaly   +2 more sources

Global kinetic simulations of neoclassical toroidal viscosity in low-collisional perturbed tokamak plasmas

Physics of Plasmas, 2017
The neoclassical toroidal viscosity (NTV) caused by a non-axisymmetric magnetic field perturbation is numerically studied using two global kinetic simulations with different numerical approaches. Both simulations reproduce similar collisionality (νb*) dependencies over wide νb* ranges.
Yasuhiro Idomura, Shinsuke Satake, Seikichi Matsuoka   +2 more
exaly   +2 more sources

Flux–force relation for non-axisymmetric tori in general flux coordinates and neoclassical toroidal plasma viscosity

Nuclear Fusion, 2010
Flux–force relation, a fundamental relation that relates transport fluxes to forces, for non-axisymmetric tori in general magnetic flux coordinates that are not Hamada coordinates, is derived. The derivation is based on kinetic theory instead of fluid theory.
K.C. Shaing, M.S. Chu, S.A. Sabbagh
openaire   +2 more sources

Theory for neoclassical toroidal plasma viscosity in tokamaks

Plasma Physics and Controlled Fusion, 2012
Error fields and magnetohydrodynamic modes break toroidal symmetry in tokamaks. The broken symmetry enhances the toroidal plasma viscosity, which results in a steady-state toroidal plasma flow. A theory for neoclassical toroidal plasma viscosity in the low-collisionality regimes is developed.
K C Shaing, M S Chu, C T Hsu, S A Sabbagh, Jae Chun Seol, Y Sun   +5 more
openaire   +1 more source

Neoclassical toroidal plasma viscosity in the superbanana regime in tokamaks

Plasma Physics and Controlled Fusion, 2009
Neoclassical toroidal plasma viscosity in the superbanana regime resulting from the symmetry breaking magnetohydrodynamic activities or error fields in tokamaks is calculated. The superbanana regime becomes important when the E × B drift frequency is comparable to or smaller than the ∇B drift frequency and when the effective collision frequency is less
K C Shaing, S A Sabbagh, M S Chu
openaire   +1 more source

Effects of neoclassical toroidal viscosity induced by the intrinsic error fields and toroidal field ripple on the toroidal rotation in tokamaks

Physics of Plasmas, 2016
Effects of neoclassical toroidal viscosity ( NTV) induced by intrinsic error fields and toroidal field ripple on cocurrent toroidal rotation in H-mode tokamak plasmas are investigated.
JaeChun Seol, Yongkyoon In, A Y Aydemir
exaly   +2 more sources

Neoclassical toroidal plasma viscosity in the superbanana plateau regime for tokamaks

Plasma Physics and Controlled Fusion, 2008
Neoclassical toroidal plasma viscosity in the superbanana plateau regime induced by the broken toroidal symmetry in |B| resulting from the error fields or magnetohydrodynamic activities in tokamaks is calculated. The transport processes in this regime are dominated by particles that have vanishing bounce averaged precession frequency, i.e.
K C Shaing, S A Sabbagh, M S Chu
openaire   +1 more source

Ideal internal kink stability in presence of plasma flow and neoclassical toroidal viscosity due to energetic particles

Nuclear Fusion, 2021
Abstract The influence of energetic particles (EPs) on the ideal internal kink mode, in rotating tokamak plasmas, is numerically investigated by simultaneously solving MHD-kinetic hybrid equations together with a toroidal momentum balance equation utilizing the MARS-Q code (Liu et al 2013 Phys. Plasmas 20 042503).
N. Zhang, Y.Q. Liu, D.L. Yu, G.Z. Hao, S. Wang, G.Q. Dong, L. Liu, Z.B. Shi, Yi Liu   +8 more
openaire   +1 more source

Effects of orbit squeezing on neoclassical toroidal plasma viscosity in tokamaks

Physics of Plasmas, 2008
The effects of orbit squeezing are important to neoclassical and anomalous transport fluxes in the region where plasma confinement is improved. This occurs in the edge region after the transition from the low confinement mode (L-mode) to the high confinement mode (H-mode) or in the vicinity of low-order rational surfaces.
K. C. Shaing, S. A. Sabbagh, M. S. Chu, M. Becoulet, P. Cahyna   +4 more
openaire   +1 more source