UKAEA Papers

"Non-perturbative modelling of energetic particle effects on resistive wall mode: Anisotropy and finite orbit width"

• Yueqiang Liu
• I. T. Chapman
• J. P. Graves
• G. Z. Hao
• Z. R. Wang
• J. E. Menard
• M. Okabayashi
• E. J. Strait
• A. Turnbull

A non-perturbative magnetohydrodynamic-kinetic hybrid formulation is developed and implemented into the MARS-K code [Liu et al., Phys. Plasmas 15, 112503 (2008)] that takes into account the anisotropy and asymmetry [Graves et al., Nature Commun. 3, 624 (2012)] of the equilibrium distribution of energetic particles (EPs) in particle pitch angle spac…

"Benchmarking kinetic calculations of resistive wall mode stability"

• J. W. Berkery
• Y. Q. Liu
• Z. R. Wang
• S. A. Sabbagh
• N. C. Logan
• J.-K. Park
• J. Manickam
• R. Betti

Validating the calculations of kinetic resistive wall mode (RWM) stability is important for confidently predicting RWM stable operating regions in ITER and other high performance tokamaks for disruption avoidance. Benchmarking the calculations of the Magnetohydrodynamic Resistive Spectrum—Kinetic (MARS-K) [Y. Liu et al., Phys. Plasmas 15, 112503 …

"Theory comparison and numerical benchmarking on neoclassical toroidal viscosity torque"

• Zhirui Wang
• Jong-Kyu Park
• Yueqiang Liu
• Nikolas Logan
• Kimin Kim
• Jonathan E. Menard

Systematic comparison and numerical benchmarking have been successfully carried out among three different approaches of neoclassical toroidal viscosity (NTV) theory and the corresponding codes: IPEC-PENT is developed based on the combined NTV theory but without geometric simplifications [Park et al., Phys. Rev. Lett. 102, 065002 (2009)]; MARS-Q inc…

"Destabilization of low-n peeling modes by trapped energetic particles"

• G. Z. Hao
• Y. Q. Liu
• A. K. Wang
• G. Matsunaga
• M. Okabayashi
• et al.

The kinetic effect of trapped energetic particles (EPs), arising from perpendicular neutral beam injection, on the stable low-n peeling modes in tokamak plasmas is investigated, through numerical solution of the mode’s dispersion relation derived from an energy principle. A resistive-wall peeling mode with m/n = 6/1, with m and n being the poloid…

"Drift kinetic effects on the resistive wall mode stability—Comparison between reversed field pinches and tokamaks"

• Z. R. Wang
• S. C. Guo
• Y. Q. Liu

The physics of kinetic effects on the resistive wall mode (RWM) stability is studied, and a comparison between reversed field pinch (RFP) and Tokamak configurations is made. The toroidal, magnetohydrodynamic (MHD)-kinetic hybrid stability code MARS-K, in which the drift kinetic effects are self-consistently incorporated into the MHD formulation, is…

"Kinetic effects of trapped energetic particles on stability of external kink modes with a resistive wall"

• G. Z. Hao
• Y. Q. Liu
• A. K. Wang
• X. M. Qiu

"Stabilization of the resistive wall mode instability by trapped energetic particles"

• G.Z. Hao
• Y.Q. Liu
• A.K. Wang
• H.B. Jiang
• Gaimin Lu
• H.D. He
• X.M. Qiu

A theoretical model for investigating the effect of the trapped energetic particles EPs on the resistive wall mode RWM instability is proposed. The results demonstrate that the trapped EPs have a dramatic stabilizing effect on the RWM because of resonant interaction between the mode and the magnetic precession drift motion of the trapped EPs. The r…