Results 81 to 90 of about 340,606 (99)
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Physics of Plasmas, 2007
A method is illustrated on how to apply existing formulas to the neoclassical toroidal plasma viscosity for an axisymmetric toroidal equilibrium with an arbitrary aspect ratio that has multiple trapping states. The effect of the energy scattering on the viscosity in the ν regime is presented using an approximate collision operator.
K. C. Shaing, S. A. Sabbagh, M. Peng
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A method is illustrated on how to apply existing formulas to the neoclassical toroidal plasma viscosity for an axisymmetric toroidal equilibrium with an arbitrary aspect ratio that has multiple trapping states. The effect of the energy scattering on the viscosity in the ν regime is presented using an approximate collision operator.
K. C. Shaing, S. A. Sabbagh, M. Peng
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Neoclassical toroidal viscosity and error-field penetration in tokamaks
Physics of Plasmas, 2008A model for field error penetration is developed that includes nonresonant as well as the usual resonant field error effects. The nonresonant components cause a neoclassical toroidal viscous torque that tries to keep the plasma rotating at a rate comparable to the ion diamagnetic frequency.
A. J. Cole, C. C. Hegna, J. D. Callen
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Neoclassical toroidal plasma viscosity in the superbanana regime in tokamaks
Plasma Physics and Controlled Fusion, 2009Neoclassical 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
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Neoclassical toroidal plasma viscosity in the superbanana plateau regime for tokamaks
Plasma Physics and Controlled Fusion, 2008Neoclassical 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
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Effects of orbit squeezing on neoclassical toroidal plasma viscosity in tokamaks
Physics of Plasmas, 2008The 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 +4 more
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Neoclassical toroidal plasma viscosity in the low collisionality regime for tokamaks
Plasma Physics and Controlled Fusion, 2008A theoretical model for the neoclassical toroidal plasma viscosity for tokamaks resulting from the symmetry breaking magnetic field perturbation caused by the collisionless detrapping/retrapping mechanism is presented. The results of the model are valid when the width of the collisional boundary layer is narrower than the width of the layer of the ...
K C Shaing, S A Sabbagh, M S Chu
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Effect of Neoclassical Toroidal Viscosity on Error-Field Penetration Thresholds in Tokamak Plasmas
Physical Review Letters, 2007A model for field-error penetration is developed that includes nonresonant as well as the usual resonant field-error effects. The nonresonant components cause a neoclassical toroidal viscous torque that keeps the plasma rotating at a rate comparable to the ion diamagnetic frequency.
A J, Cole, C C, Hegna, J D, Callen
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Nuclear Fusion, 2014
A cooperation framework for analyses and predictions of the neoclassical toroidal viscosity (NTV) and the resultant toroidal flow is developed among the TOPICS, VMEC and FORTEC-3D codes. With the real geometry in JT-60U taken into account, it is found that the NTV is one of the cardinal torque sources especially in the edge region irrespective of the ...
M. Honda +8 more
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A cooperation framework for analyses and predictions of the neoclassical toroidal viscosity (NTV) and the resultant toroidal flow is developed among the TOPICS, VMEC and FORTEC-3D codes. With the real geometry in JT-60U taken into account, it is found that the NTV is one of the cardinal torque sources especially in the edge region irrespective of the ...
M. Honda +8 more
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Numerical validation of the refined formula of neoclassical toroidal plasma viscosity in tokamaks
Nuclear Fusion, 2013Neoclassical toroidal plasma viscosity (NTV) theory in collisionless regimes in tokamaks has been well developed in the past. The NTV evaluated from the connected formula developed by Shaing et al (2010 Nucl. Fusion 50 025020) was in good agreement with the numerical results in most cases.
Y. Sun +4 more
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Collisional boundary layer analysis for neoclassical toroidal plasma viscosity in tokamaks
Physics of Plasmas, 2008It 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
K. C. Shaing +5 more
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