40 citations · 259 across the 17 of their papers we have counts for
12 papers · 1 filter
Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma
Hongxuan Zhu, T. Stoltzfus-Dueck, R. Hager +2
Ion orbit loss has been used to model the formation of a strong negative radial electric field in the tokamak edge, as well as edge momentum transport and toroidal rotation.…
Effects of collisional ion orbit loss on neoclassical tokamak radial electric fields
Hongxuan Zhu, T. Stoltzfus-Dueck, R. Hager +2
Ion orbit loss is considered important for generating the radially inward electric field in a tokamak edge plasma. In particular, this effect is emphasized in diverted tokama…
Wave-kinetic approach to zonal-flow dynamics: recent advances
Hongxuan Zhu, I. Y. Dodin
Basic physics of drift-wave turbulence and zonal flows has long been studied within the framework of wave-kinetic theory. Recently, this framework has been re-examined from first p…
Theory of the tertiary instability and the Dimits shift within a scalar model
Hongxuan Zhu, Yao Zhou, I. Y. Dodin
The Dimits shift is the shift between the threshold of the drift-wave primary instability and the actual onset of turbulent transport in magnetized plasma. It is generally attribut…
Theory of the tertiary instability and the Dimits shift from reduced drift-wave models
Hongxuan Zhu, Yao Zhou, I. Y. Dodin
Tertiary modes in electrostatic drift-wave turbulence are localized near extrema of the zonal velocity with respect to the radial coordinate . We argue that these modes c…
Solitary zonal structures in subcritical drift waves: a minimum model
Yao Zhou, Hongxuan Zhu, I. Y. Dodin
Solitary zonal structures have recently been identified in gyrokinetic simulations of subcritical drift-wave (DW) turbulence with background shear flows. However, the nature of the…
Nonlinear saturation and oscillations of collisionless zonal flows
Hongxuan Zhu, Yao Zhou, I. Y. Dodin
In homogeneous drift-wave (DW) turbulence, zonal flows (ZFs) can be generated via a modulational instability (MI) that either saturates monotonically or leads to oscillations of th…
Formation of solitary zonal structures via the modulational instability of drift waves
Yao Zhou, Hongxuan Zhu, I. Y. Dodin
The dynamics of the radial envelope of a weak coherent drift wave is approximately governed by a nonlinear Schrödinger equation, which emerges as a limit of the modified Hasegawa-M…
On the structure of the drifton phase space and its relation to the Rayleigh--Kuo criterion of the zonal-flow stability
Hongxuan Zhu, Yao Zhou, I. Y. Dodin
The phase space of driftons (drift-wave quanta) is studied within the generalized Hasegawa--Mima collisionless-plasma model in the presence of zonal flows. This phase space is made…
On the Rayleigh--Kuo criterion for the tertiary instability of zonal flows
Hongxuan Zhu, Yao Zhou, I. Y. Dodin
This paper reports the stability conditions for intense zonal flows (ZFs) and the growth rate of the corresponding "tertiary" instability (TI) within the generalized H…
Wave kinetics of drift-wave turbulence and zonal flows beyond the ray approximation
Hongxuan Zhu, Yao Zhou, D. E. Ruiz +1
Inhomogeneous drift-wave turbulence can be modeled as an effective plasma where drift waves act as quantumlike particles and the zonal-flow velocity serves as a collective field th…
On the correspondence between classical geometric phase of gyro-motion and quantum Berry phase
Hongxuan Zhu, Hong Qin
We show that the geometric phase of the gyro-motion of a classical charged particle in a uniform time-dependent magnetic field described by Newton's equation can be derived from a…