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7 papers · 1 filter
The shear Alfvén continuum with a magnetic island chain in tokamak plasmas
Zhisong Qu, Matthew Hole
The shear Alfvén continuum spectrum is studied for a tokamak with a single island chain using the ideal Magnetohydrodynamics (MHD) theory. We have taken into account the toroidal g…
On the non-existence of stepped-pressure equilibria far from symmetry
Z. S. Qu, S. R. Hudson, R. L. Dewar +2
The Stepped Pressure Equilibrium Code (SPEC) [Hudson et al., Phys. Plasmas 19, 112502 (2012)] has been successful in the construction of equilibria in 3D configurations that contai…
Simulation of convective transport during frequency chirping of a TAE using the MEGA code
Hooman Hezaveh, Yasushi Todo, Zhisong Qu +2
We present a procedure to examine energetic particle phase-space during long range frequency chirping phenomena in tokamak plasmas. To apply the proposed method, we have performed…
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…
Stepped pressure equilibrium with relaxed flow and applications in reversed-field pinch plasmas
Z. S. Qu, R. L. Dewar, F. Ebrahimi +3
The Multi-region Relaxed MHD (MRxMHD) has been successful in the construction of equilibria in three-dimensional (3D) configurations. In MRxMHD, the plasma is sliced into sub-volum…