142 citations · 318 across the 18 of their papers we have counts for
18 papers
First reduced model for integrated computations of helicon wave heating and current drive in magnetic fusion plasmas
Zi-Chen Kan, Lei Chang, Zhen-Yu Wang +9
Fast predictive modelling of radio-frequency heating and current drive is important for integrated tokamak scenario design, yet kinetic calculations of helicon-wave absorption rema…
Relaxed magnetohydrodynamics with cross-field flow
Arash Tavassoli, Stuart R. Hudson, Zhisong Qu +1
The phase-space Lagrangian model of Dewar et al. (Phys. Plasmas 27, 062507, 2020) provides a framework for incorporating cross-field flow into relaxed equilibria while retaining id…
Shear Alfvén Waves in Chaotic Magnetic Fields
Matthew Thomas, Zhisong Qu, Matthew Hole
The shear Alfvén spectrum is computed in the presence of symmetry breaking perturbations that introduce chaotic magnetic field trajectories. Quadratic flux minimised surfaces allow…
Sawtooth crash in tokamak as a sequence of Multi-region Relaxed MHD equilibria
Zhisong Qu, Yao Zhou, Arunav Kumar +3
This study examines the sawtooth crash phenomenon in tokamak plasmas by modelling it as a sequence of Multi-region Relaxed Magnetohydrodynamic (MRxMHD) equilibria. Using the Steppe…
Near-ideal relaxed MHD in slab geometry
Arash Tavassoli, Stuart R. Hudson, Zhisong Qu +1
We investigate the solutions of the relaxed MHD model (RxMHD) of Dewar \& Qu [J. Plasma Phys. {\bf 88}, 835880101 (2022)]. This model generalizes Taylor relaxation by including the…
On the relationship between the multi-region relaxed variational principle and resistive inner layer theory
A. Kumar, J. Loizu, M. J. Hole +3
We show that the variational energy principle of multi-region relaxed magnetohydrodynamic (MRxMHD) model can be used to predict finite-pressure linear tearing instabilities. In thi…
Theoretical description of chirping waves using phase-space waterbags
Hooman Hezaveh, Zhisong Qu, Matthew Hole +1
The guiding centre dynamics of fast particles can alter the behaviour of energetic particle driven modes with chirping frequencies. In this paper, the applicability of an earlier t…
Time-dependent relaxed magnetohydrodynamics -- inclusion of cross helicity constraint using phase-space action
R. L. Dewar, J. W. Burby, Z. Qu +2
A new formulation of time-dependent Relaxed Magnetohydrodynamics (RxMHD) is derived variationally from Hamilton's Action Principle using microscopic conservation of mass, and macro…
Sandpile modelling of dual location fuelling in fusion plasmas
C. A. Bowie, M. J. Hole
We modify the Chapman sandpile model (Chapman \textit{et al} \textit{Physical Review Letters} 86, 2814 (2001)) to form comparisons with pellet pacing, which is used to reduce or el…
The impact of anisotropy on ITER scenarios
M. J. Hole, Z. Qu, S. Pinches +4
We report on the impact of anisotropy to tokamak plasma configuration and stability. Our focus is on analysis of the impact of anisotropy on ITER pre-fusion power operation 5~MA, $…
Impact of energetic particle orbits on long range frequency chirping of BGK modes
H. Hezaveh, Z. S. Qu, B. Layden +1
Long range frequency chirping of Bernstein-Greene-Kruskal modes, whose existence is determined by the fast particles, is investigated in cases where these particles do not move fre…
Spectrum of multi-region-relaxed magnetohydrodynamic modes in topologically toroidal geometry
Robert L Dewar, Li Huey Tuen, Matthew J Hole
A general formulation of the problem of calculating the spectrum of stable and unstable eigenmodes of linearized perturbations about a magnetically confined toroidal plasma is pres…
A minimally constrained model of self-organized helical states in reversed-field pinches
G. R. Dennis, S. R. Hudson, D. Terranova +3
We show that the self-organized single-helical-axis (SHAx) and double-helical-axis (DAx) states in reversed field pinches can be reproduced in a minimally constrained equilibrium m…
EFIT tokamak equilibria with toroidal flow and anisotropic pressure using the two-temperature guiding-centre plasma
Michael Fitzgerald, Lynton C. Appel, Matthew J. Hole
A new force balance model for the EFIT magnetohydrodynamic equilibrium technique for tokamaks is presented which includes the full toroidal flow and anisotropy changes to the Grad-…
Computation of multi-region relaxed magnetohydrodynamic equilibria
S. R. Hudson, R. L. Dewar, G. Dennis +4
We describe the construction of stepped-pressure equilibria as extrema of a multi-region, relaxed magnetohydrodynamic (MHD) energy functional that combines elements of ideal MHD an…
Nonaxisymmetric, multi-region relaxed magnetohydrodynamic equilibrium solutions
S. R. Hudson, R. L. Dewar, M. J. Hole +1
We describe a magnetohydrodynamic (MHD) constrained energy functional for equilibrium calculations that combines the topological constraints of ideal MHD with elements of Taylor re…
Relaxed MHD states of a multiple region plasma
M. J. Hole, R. Mills, S. R. Hudson +1
We calculate the stability of a multiple relaxation region MHD (MRXMHD) plasma, or stepped-Beltrami plasma, using both variational and tearing mode treatments. The configuration st…
Magnetohydrodynamic Stability of Plasmas with Ideal and Relaxed Regions
R. L. Mills, M. J. Hole, R. L. Dewar
A unified energy principle approach is presented for analysing the magnetohydrodynamic (MHD) stability of plasmas consisting of multiple ideal and relaxed regions. By choosing an a…