Toroidal modeling of interaction between resistive wall mode and plasma flow

Liu, Yueqiang; Sun, Yuan

doi:10.1063/1.4793449

Cited by 16 publications

(8 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A number of theoretical NTV approximations and corresponding computational models have been developed to explain and guide experiments, each with a unique physics emphasis. These include large aspect ratio models with detailed collision operators [7,8], collisionality regime models [9,10], Krook collisionality models emphasizing bounce harmonic resonances and general geometry [11,12], and stability models that utilize the kinetic energy equivalency principle [13][14][15]. Extensive efforts have benchmarked these models and the detailed kinetic physics captured therein [8,14,15], providing confidence in the models and a clear understanding of their limits of applicability.…”

Section: Introductionmentioning

confidence: 99%

Dependence of neoclassical toroidal viscosity on the poloidal spectrum of applied nonaxisymmetric fields

et al. 2016

View full text Add to dashboard Cite

This paper presents a single mode model that accurately predicts the coupling of applied nonaxisymmetric fields to the plasma response that induces neoclassical toroidal viscosity (NTV) torque in DIII-D H-mode plasmas. The torque is measured and modeled to have a sinusoidal dependence on the relative phase of multiple nonaxisymmetric field sources, including a minimum in which large amounts of nonaxisymmetric drive is decoupled from the NTV torque. This corresponds to the coupling and decoupling of the applied field to a NTV-driving mode spectrum. Modeling using the perturbed equilibrium nonambipolar transport (PENT) code confirms an effective single mode coupling between the applied field and the resultant torque, despite its inherent nonlinearity. The coupling to the NTV mode is shown to have a similar dependence on the relative phasing as that of the IPEC dominant mode, providing a physical basis for the efficacy of this linear metric in predicting error field correction optima in NTV dominated regimes.

show abstract

Section: Introductionmentioning

confidence: 99%

Dependence of neoclassical toroidal viscosity on the poloidal spectrum of applied nonaxisymmetric fields

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Note that although the numerical results are more general, they take a significantly longer time to compute, such that using the connected formula is more suitable for self-consistently investigating the interaction between NTV rotation braking and plasma stability. The module for NTV torque density evaluation in the NTVTOK code has also been successfully implemented in the full toroidal geometry MHD code, MARS-Q, for plasma response studies [25,26].…”

Section: Introductionmentioning

confidence: 99%

Numerical validation of the refined formula of neoclassical toroidal plasma viscosity in tokamaks

et al. 2013

View full text Add to dashboard Cite

Neoclassical 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. The boundary condition in the superbanana plateau regime has been found to be important in the numerical modelling when the resonant pitch is close to the boundaries of the pitch angle space, but it was not included in the original connected formula. This generates a big discrepancy between the numerical results and those evaluated from the smoothly connected formula as the resonant pitch is close to 0 or 1. Recently, the connected formula was refined. In this paper, we present the method of how to apply this refinement for practical NTV modelling and demonstrate the improvement of this refined formula by comparing the results evaluated from it with the numerical ones. Some techniques are developed to accurately model the NTV with the refined formula. The accuracy of the results modelled from the refined formula is strongly improved over the previous formula as the resonant pitch is close to 0 or 1 and they agree very well with the numerical ones.

show abstract

“…These aspects will be investigated in the near future, using the quasi-linear code MARS-Q. 25 Physics of Plasmas is copyrighted by the American Institute of Physics (AIP). Redistribution of journal material is subject to the AIP online journal license and/or AIP copyright.…”

mentioning

confidence: 99%

Resistive wall tearing mode generated finite net electromagnetic torque in a static plasma

et al. 2014

View full text Add to dashboard Cite

The MARS-F code [Y. Q. Liu et al., Phys. Plasmas 7, 3681 (2000)] is applied to numerically investigate the effect of the plasma pressure on the tearing mode stability as well as the tearing mode-induced electromagnetic torque, in the presence of a resistive wall. The tearing mode with a complex eigenvalue, resulted from the favorable averaged curvature effect [A. H. Glasser et al., Phys. Fluids 18, 875 (1975)], leads to a re-distribution of the electromagnetic torque with multiple peaking in the immediate vicinity of the resistive layer. The multiple peaking is often caused by the sound wave resonances. In the presence of a resistive wall surrounding the plasma, a rotating tearing mode can generate a finite net electromagnetic torque acting on the static plasma column. Meanwhile, an equal but opposite torque is generated in the resistive wall, thus conserving the total momentum of the whole plasma-wall system. The direction of the net torque on the plasma is always opposite to the real frequency of the mode, agreeing with the analytic result by Pustovitov [Nucl. Fusion 47, 1583(2007]. When the wall time is close to the oscillating time of the tearing mode, the finite net torque reaches its maximum. Without wall or with an ideal wall, no net torque on the static plasma is generated by the tearing mode. However, re-distribution of the torque density in the resistive layer still occurs. V C 2014 AIP Publishing LLC.

show abstract

Toroidal modeling of interaction between resistive wall mode and plasma flow

Cited by 16 publications

References 27 publications

Dependence of neoclassical toroidal viscosity on the poloidal spectrum of applied nonaxisymmetric fields

Dependence of neoclassical toroidal viscosity on the poloidal spectrum of applied nonaxisymmetric fields

Numerical validation of the refined formula of neoclassical toroidal plasma viscosity in tokamaks

Resistive wall tearing mode generated finite net electromagnetic torque in a static plasma

Contact Info

Product

Resources

About