Bifurcation behaviour of resonant magnetic perturbation control of edge localized modes in tokamaks: nonlinear simulation results. (20th February 2023)

• Record Type: Journal Article
• Authors: Thyagaraja, Anantanarayanan; Sen, Abhijit; Chandra, Debasis
• Is Part Of: Philosophical transactions. Volume 381:Number 2242(2023)
• Publication Date: 2023-02-20
• Subjects: Type I ELMs -- bifurcation -- mitigation -- suppression; Physical sciences -- Periodicals; Engineering -- Periodicals; Mathematics -- Periodicals; 500
• DOI: 10.1098/rsta.2022.0161
• Languages: English
• ISSNs: 1364-503X

Abstract

Abstract : In this article, some novel results of two fluid nonlinear simulations on the control of edge localized modes (ELMs) in tokamaks by resonant magnetic perturbations (RMPs) are presented. Many experiments around the world have demonstrated that RMPs are effective in possibly mitigating or even completely suppressing strong (type I) ELMs that would seriously degrade confinement and could cause other heat-flux problems in both present (e.g. JET) and planned future tokamaks (ITER). Our simulations demonstrate that non-axisymmetric RMPs with toroidal mode numbers n = 2, 3, 4 and suitable field-strengths (kAturns) at the plasma wall imply significant bifurcations in their ability to mitigate or even suppress type-I ELMs, qualitatively similar to RMP effects on ELMs reported in experiments. This article is part of a discussion meeting issue 'H-mode transition and pedestal studies in fusion plasmas'.