UKAEA Papers

"Extended electron tails in electrostatic microinstabilities and the nonadiabatic response of passing electrons"

• M. R. Hardman
• F. I. Parra
• C. Chong
• T. Adkins
• M. S. Anastopoulos-Tzanis
• M. Barnes
• D. Dickinson
• J. F. Parisi
• H. Wilson

Ion-gyroradius-scale microinstabilities typically have a frequency comparable to the ion transit frequency. Hence, it is conventionally assumed that passing electrons respond adiabatically in ion-gyroradius-scale modes, due to the small electron-to-ion mass ratio and the large electron transit frequency. However, in gyrokinetic simulations of io…

"Perturbative 3D Ideal MHD Stability of Tokamak Plasmas"

• M.S. Anastopoulos-Tzanis
• B.D. Dusdson
• C.J. Ham
• C.C. Hegna
• P.B. Snyder
• H.R. Wilson

"Non-Axisymmetric Equilibrium and Stability using the ELITE Stability Code"

• M.S. Anastopoulos-Tzanis
• B.D. Dudson
• C.J. Ham
• C.C. Hegna
• P.B. Snyder
• H.R. Wilson

A linear perturbation theory is used to model the MHD stability of tokamak equilibria under the application of external 3D magnetic perturbations [C.C. Hegna, Physics of Plasmas 21 :072502, 2014]. The symmetry breaking produces the coupling of toroidal n modes. We use ELITE [H.R. Wilson et al., Physics of Plasmas 9 :1277, 2002] to produ…

"The Impact of Symmetry Breaking on Pedestal Stability of Tokamak Plasmas"

• M.S. Anastopoulos-Tzanis
• C.H. Ham
• H.R. Wilson

H-mode tokamak plasmas are typically characterised by quasi-periodic instabilities called edge localised modes (ELMs) driven by unstable peeling-ballooning modes [1]. For large scale fusion power plants, the predicted particle and heat fluxes are unacceptable, and an active ELM control method is required. One promising method relies on t…