Critical role of current-driven instabilities for ELMs in NSTX

A Kleiner, NM Ferraro, G Canal, A Diallo… - Nuclear …, 2022 - iopscience.iop.org
The impact of different extended-magnetohydrodynamic (MHD) contributions on the stability
thresholds of peeling-ballooning modes in ELMing and ELM-free plasmas in the spherical …

How well can VMEC predict the initial saturation of external kink modes in near circular tokamaks and l= 2 stellarators?

R Ramasamy, M Hoelzl, S Henneberg… - Physics of …, 2023 - pubs.aip.org
The equilibrium code, VMEC, is used to study external kinks in low b tokamaks and l ¼ 2
stellarators. The applicability of the code when modeling nonlinear MHD effects is explored …

[HTML][HTML] Predictive nonlinear MHD simulations of quiescent H-mode plasma in the HL-3 tokamak

Z Liang, M Hoelzl, A Cathey, D Hu, SY Dai, YL Liu… - Physics of …, 2025 - pubs.aip.org
In this article, we investigate the edge localized mode (ELM)-free quiescent H (QH)-mode
regime in the HL-3 tokamak via nonlinear MHD simulations. HL-3 (previously known as HL …

Edge harmonic oscillations in plasmas with a separatrix and the effect of edge magnetic shear

GB Ramirez, JP Graves, D Brunetti - Plasma Physics and …, 2021 - iopscience.iop.org
This work presents an extension of exfernal mode theory, where the effects of edge
magnetic shear and plasma separatrix are investigated and applied to edge harmonic …

Pressure driven long wavelength MHD instabilities in an axisymmetric toroidal resistive plasma

JP Graves, M Coste-Sarguet… - Plasma Physics and …, 2021 - iopscience.iop.org
A general set of equations that govern global resistive interchange, resistive internal kink
and resistive infernal modes in a toroidal axisymmetric equilibrium are systematically …

[HTML][HTML] Modeling of saturated external MHD instabilities in tokamaks: A comparison of 3D free boundary equilibria and nonlinear stability calculations

R Ramasamy, GB Ramirez, M Hoelzl, J Graves… - Physics of …, 2022 - pubs.aip.org
3D free boundary equilibrium computations have recently been used to model external kinks
and edge harmonic oscillations (EHOs), comparing with linear MHD stability codes, and …

Heavy impurity transport in tokamaks subject to plasma rotation, NTV and the influence of saturated ideal MHD perturbations

EL Neto, JP Graves, M Raghunathan… - Plasma Physics and …, 2021 - iopscience.iop.org
Heavy impurity transport in tokamaks subject to plasma rotation, NTV and the influence of
saturated ideal MHD perturbations - IOPscience This site uses cookies. By continuing to use …

Understanding JET-C quiescent phases with edge harmonic magnetohydrodynamic activity and comparison with behaviour under ITER-like wall conditioning

D Brunetti, CJ Ham, JP Graves, E Lazzaro… - Plasma Physics and …, 2022 - iopscience.iop.org
An analysis of edge localised mode-free (quiescent) H-mode discharges exhibiting edge
harmonic magnetoydrodynamic activity in the JET-carbon wall machine is presented. It is …

Nonlinear saturation of resistive tearing modes in a cylindrical tokamak with and without solving the dynamics

J Loizu, D Bonfiglio - Journal of Plasma Physics, 2023 - cambridge.org
We show that the saturation of resistive tearing modes in a cylindrical tokamak, as well as
the corresponding island width, can be directly calculated with a magnetohydrodynamics …

Modelling of non-linear edge harmonic oscillations and the effect of non-axisymmetric magnetic coils

G Bustos Ramirez, J Graves, A Kleiner… - … EPS Conference on …, 2019 - infoscience.epfl.ch
Quiescent H-mode (QH-mode) operation is highly desirable relative to the well known H-
mode operation because it allows for high energy density in the core as well as potentially …