Yi Zhang

Yi Zhang
Southwestern Institute of Physics · Department of Physics

Doctor of Philosophy

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15
Publications
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55
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Introduction
Skills and Expertise

Publications

Publications (15)
Article
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A systematic study of the edge localized mode (ELM) characteristics in HL-3 is performed based on a set of scenarios constructed by Kinetic EFIT workflow. The edge localized instabilities in tokamaks equilibria (ELITE) code (an eigenvalue solver) is used to calculate the peeling-ballooning (P-B) instability diagram. It is shown that the reference e...
Article
Full-text available
In tokamak plasmas, various Magnetohydrodynamic (MHD) instabilities could be driven by free energy, which enhance the plasma’s transportation, leading to a reduction in critical fusion parameters such as temperature and density, and in severe cases, can even cause major plasma disruptions. Accurate identification and active control of MHD is an imp...
Article
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This paper investigates the compatibility of pronounced detachment with improved confinement based on the NBI-heated HL-2A L-mode plasma with low-density. Through impurity seeding, radiation becomes higher at plasma edge and causes edge cooling after pronounced detachment. Turbulent transport is examined in detail by experiments and global integrat...
Article
Full-text available
Since the first plasma realized in 2020, a series of key systems on HL-3 (known as HL-2M before) tokamak have been equipped/upgraded, including in-vessel components (the first wall, lower divertor, and toroidal cryogenic/water-cooling/baking/glow discharge systems, etc.), auxiliary heating system of 11 MW, and 28 diagnostic systems (to measure the...
Article
Full-text available
Triangularity is an important shaping parameter in tokamak plasmas that affects the edge plasma state. In this work, we utilize the BOUT++ code to study the effect of positive and negative triangularity on the peeling–ballooning modes with H-mode profiles. The model equilibria with a JET-like geometry are self-consistently generated by the CORSICA...
Article
Full-text available
We present an analytical model to evaluate the triangularity-shaping effects in accessing the second stable region for the ideal ballooning mode. Our results indicate that if the triangularity is sufficiently negative, the path from the first to the second stable region will be closed. The reason is that negative triangularity can weaken the stabil...
Article
We study the nonlocal phase coupling during turbulence spreading across the magnetic island. It is found that the coherent convective cells (sharing similar features to quasi-coherent mode in experiment) on both sides of the O-point boundary are accumulated during the island formation. The phase entrainment of the convective cells on the turbulence...
Article
Full-text available
This paper uses data from limited HL-2A Ohmic-plasma to answer the question of how turbulent transport broadens the heat flux width. A key issue in this study is the determination of the origin of scrape-off layer (SOL) turbulence. We develop the concept of the energy production ratio Ra , which compares the flux of turbulence energy across the las...
Article
The topology of the vortex flow associated with the magnetic island plays a significant role in modulating the turbulent transport near the magnetic island. In this paper, self-consistent nonlinear simulations of multi-scale interactions among large scale tearing mode, vortex flow, and small scale ion temperature-gradient (ITG) mode are numerically...
Article
Phase mixing is a general mechanism of collisionless damping in magnetized plasmas. In a MHD model, the carrier of phase mixing is the Alfvén wave continuum, which is driven by the plasma inhomogeneity. In this work, we study the non-resonant conversion of a surface MHD eigenmode to the Alfvén continuum. It is shown that the finite-time-singularity...
Article
We carry out several numerical simulations to illustrate how the radial electric field ( E r ) impacts the edge magnetohydrodynamic (MHD) instabilities. The analyses reveal that E r -shear ([Formula: see text], here the prime denotes the derivative with respect to the radial direction) tends to stabilize the kink[Formula: see text]Peeling–Balloonin...
Article
We investigate nonlinear phase dynamics of an ideal kink mode, induced by E × B flow. Here the phase is the cross phase ( θ c ) between perturbed stream function of velocity ( ϕ ˜ ) and magnetic field ( ψ ˜ ), i.e. θ c = θ ϕ − θ ψ . A dimensionless parameter, analogous to the Richardson number, R i = 16 γ kink 2 / ω ˆ E 2 ( γ kink : the normalized...
Article
We show that the radial electric field (Er) plays a dual role in edge magnetohydrodynamics (MHD) activity. While Er shear (first spatial derivative of Er) dephases radial velocity and displacement, and so is stabilizing, a new finding here is that Er curvature (second spatial derivative of Er) tends to synchronize the radial velocity and displaceme...
Article
We investigate how the E × B shearing profile impacts the energy transport induced by the MHD mode in the edge of H-mode plasmas. By enhancing the outer layer (ψnor ≈ 0.9–1) shear, the growth rate spectrum γ(n) gets narrowed with the fastest growth rate having a lower toroidal mode number. In the nonlinear stage, the MHD fluctuations tend to reach...
Article
The influence of plasma resistivity on the edge localized mode is studied with the BOUT++ code. From the linear simulation, it is found that the growth rate of the peeling-ballooning mode is mainly affected by the plasma resistance in the middle of the pedestal, while the resistance on the top or at the bottom of the pedestal plays a lesser role. F...

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