Guoliang Xiao
A5033920978- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Nuclear reactor physics and engineering
- Plasma Diagnostics and Applications
- Solar and Space Plasma Dynamics
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Cancer Mechanisms and Therapy
- interferon and immune responses
- Physics of Superconductivity and Magnetism
- Meteorological Phenomena and Simulations
- Innovations in Concrete and Construction Materials
- Metal and Thin Film Mechanics
- GaN-based semiconductor devices and materials
- Ubiquitin and proteasome pathways
- Innovative concrete reinforcement materials
- Atomic and Subatomic Physics Research
- Mechanics and Biomechanics Studies
- Hydrocarbon exploration and reservoir analysis
- Particle Detector Development and Performance
- Structural Engineering and Vibration Analysis
- Astrophysics and Cosmic Phenomena
Southwestern Institute of Physics
2016-2024
Oil and Gas Center
2022
PetroChina Southwest Oil and Gas Field Company (China)
2022
CEA Cadarache
2020
Hainan Medical University
2020
Southwest Jiaotong University
2020
Southwest Medical University
2020
Neijiang Normal University
2020
Tsinghua University
2017-2019
Abstract Abstract
In this paper, we introduce a novel X-point Slot Closure (XSC) divertor developed for the HL-3 tokamak. The XSC combines benefits of W-shaped, V-shaped, SAS (Small Angle Slot), and CRD (Compact Radiative Divertor) divertors into compact design that is compatible with high-elongation high-triangularity double-null configurations. This offers three key advantages. First, its structure, positioned near dome top, reduces volume while increasing overall plasma volume....
Abstract Since the last IAEA Fusion Energy Conference in 2018, significant progress of experimental program HL-2A has been achieved on developing advanced plasma physics, edge localized mode (ELM) control physics and technology. Optimization confinement performed. In particular, high- β N H-mode plasmas exhibiting an internal transport barrier have obtained (normalized pressure reached up to 3). Injection impurity improved confinement. ELM using resonance magnetic perturbation or injection a...
The mission of HL-2A is to explore the key physical topics relevant ITER and advanced tokamak operation (e.g. future HL-2M), such as access H-mode, energetic particle physics, edge-localized mode (ELM) mitigation/suppression disruption mitigation. Since 2016 Fusion Energy Conference, team has focused on investigations following areas: (i) pedestal dynamics L–H transition, (ii) techniques ELM control, (iii) turbulence transport, (iv) physics. results demonstrated that increase mean shear flow...
Since the last Fusion Energy Conference, significant progress has been made in following areas. The first high coupling efficiency low-hybrid current drive (LHCD) with a passive–active multi-junction (PAM) antenna was successfully demonstrated H-mode on HL-2A tokamak. Double critical impurity gradients of electromagnetic turbulence were observed plasmas. Various ELM mitigation techniques have investigated, including supersonic molecular beam injection (SMBI), seeding, resonant magnetic...
In HL-2A and J-TEXT ohmic confinement regimes, an electrostatic turbulence with quasi-coherent characteristics in spectra of density fluctuations was observed by multi-channel microwave reflectometers. These modes (QCMs) were detectable a large plasma region (r/a∼0.3−0.8). The characteristic frequencies QCMs the range 30–140 kHz. mode is rotated electron diamagnetic direction. plasmas QCMs, trapped (TEM) predicted to be unstable gyrokinetic simulations. combined experimental results show...
The impact of impurity ions on a pedestal has been investigated in the HL-2A Tokamak, at Southwestern Institute Physics, Chengdu, China. Experimental results have clearly shown that during $H$-mode phase, an electromagnetic turbulence was excited edge plasma region, where exhibited peaked profile. It found double critical gradients are responsible for triggering turbulence. Strong stiffness profile observed cyclic transitions between $I$-phase and regime. suggest underlying physics...
Abstract The effect of lower hybrid current drive (LHCD) on edge velocity shear and turbulence in the HL-2A tokamak has been investigated. Experimental results demonstrate that LHCD leads to an increase at both inner outer layers, with magnitude increment found be proportional applied power. This enhancement is primarily attributed changes plasma pressure gradient induced by heating wave. In addition, also modifies edge, it observed higher wavenumbers exhibits a clear LHCD, whereas shows no...
Abstract 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 wall, lower divertor, and toroidal cryogenic/water-cooling/baking/glow discharge systems, etc.), auxiliary heating system 11 MW, 28 diagnostic (to measure density, electron temperature, radiation, magnetic field, etc.). Magnet field were commissioned firstly for divertor discharges. During 2nd experimental campaign...
Abstract We report the first interpretation of ion cyclotron emission (ICE) based on frequency variation in HL-2A tokamak experiments. The measured frequencies ICE are concentrated around frequency, while simultaneously exhibiting a linear scaling with Alfvén velocity. A fully kinetic simulation demonstrates that low fast concentration, approaches wave dispersion relation. relation is similar to “equatorial noise” inner magnetosphere, providing new opportunities for comparing physical model...
Abstract Improved energy confinement mode (I-mode) has been observed on the HL-2A tokamak. The I-mode features an edge transport barrier (ETB) in electron temperature and a low like density. A weakly coherent (WCM) is region with frequency of <?CDATA $f\sim 60{-}160$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>f</mml:mi> <mml:mo>∼</mml:mo> <mml:mn>60</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> </mml:mrow> <mml:mn>160</mml:mn> </mml:math> kHz poloidal...
Abstract Turbulent transport of impurity ions with hollow density profiles (HDPs), which are widely observed in magnetically confined plasmas and desirable for fusion reactor, is self-consistently investigated. A full gyrokinetic description employed main ions. Instead conventional ion temperature gradient (ITG, including ITG) trapped electron modes (TEMs), (IMs), driven by opposite to that electrons, considered. The flux induced IMs shown be approximately one order magnitude higher than...
Abstract The HL-2A tokamak has a very closed divertor geometry, and new infrared camera been installed for high resolution studies of edge-localized mode (ELM) heat load onto the outer targets. characteristics power deposition patterns on lower target plates during ELMs are systematically analysed with thermography. ELM energy loss is in range 3%–8% total plasma stored energy. peak flux targets currently achieved about 1.5–3.2 MW m −2 , wetted area 0.5–0.7 2 corresponding integrated decay...
Edge localized mode (ELM) mitigation with lower hybrid current drive (LHCD) has been observed in the HL-2A tokamak. This effect is very sensitive to parameters as plasma density and LHCD absorbed power, i.e., more easily be for high large power. The divertor peak heat load released by ELM significantly reduced during phase. pedestal gradient slightly mitigation, rotation velocity ion temperature are LHCD. It found that not synchronized LHCD, while it increase of turbulence, showing...
Interactions among pedestal shear flows, turbulence, and the formation of edge transport barrier have been studied in H-mode plasmas HL-2A tokamak by multi-channel Doppler reflectometry with high spatiotemporal resolution. Geodesic acoustic mode (GAM) has observed during L-I-H transition. It that plasma transits into I-phase when mean E×B flow reaches a critical value. The bi-spectrum analysis shown there is strong interaction between GAM limit cycle oscillation (LCO), energy transfer from...
The impact of supersonic molecular beam injection (SMBI) fuelling on the plasma turbulence and shear flows, which form a self-consistent state, has been studied in HL-2A tokamak. SMBI flattens layer by collisional flow damping increases intensity. It is found that can enhance non-linear regulation dynamics acts as an external tool for quench via stimulating two dynamic processes. SMBI-stimulated interactions facilitate L-H transition at marginal heating power accessing H-mode. effective...
Abstract Impurity seeding has been confirmed to be a potential way for edge localized modes (ELMs) mitigated in tokamaks. This paper mainly combines the integrated equilibria reconstruction framework and simulation codes such as BOUT++ dive deeper into mechanism of ELM mitigation by impurity injection. On one hand, injection changes pedestal pressure current profiles that are closely related activities. The nonlinear result shows size decreases factor 2 4 when exceeds threshold after other...
Experimental observations and theoretical interpretations are presented in detail for the high frequency axisymmetric mode driven by nonlinear coupling. In neutral beam injection heating plasma, toroidal Alfvén eigenmodes (TAEs) found to nonlinearly interact with tearing result generation of other Alfvénic sidebands (Chen et al 2014 Europhys. Lett. 107 25001). Then two TAEs couple together contribute excitation an ellipticity-induced eigenmode (EAE) region. Direct evidence suggests modes...
Abstract In fusion research, the diagnostic data are obtained from different systems, which relatively independent (in terms of response function, noise, calibration, etc…). The consequence is that many measurements providing same physical quantity could provide results. this work, Bayesian probability inference has been applied to frequency modulated continuous wave reflectometry and Far-infrared laser interferometer systems on HL-2A tokamak, offering integrated analysis (IDA) for electron...
Abstract Instabilities in multiplies of ion cyclotron frequency range are identified and termed as core emission (ICE) recent HL-2A neutral beam injection heated experiments. Characteristics the ICE presented, including dependence harmonics features. The detected frequencies found to agree well with deuterium around magnetic axis. Additionally, exhibits a predominantly compressional property. Observations distinct spectrum features individual excitation each harmonic have demonstrated that...
Abstract As the newly built tokamak in China, HL-3 will explore high-performance operation scenarios, such as super H-mode. The energy confinement and core parameters H-mode can be much larger than that normal Based on pedestal simulation code EPED, space of is obtained HL-3. Magnetic shear decreases with increasing triangularity; consequently, a achieved. threshold triangularity for accessing around 0.4. By using BOUT++, nonlinear study instabilities equilibrium executed first time....
This paper presents recent Lower Hybrid Current Drive (LHCD) progress in SWIP, including the experiments on HL-2A and system development HL-2M. The 3.7GHz LHCD was built HL-2A, where first Wave (LHW) coupling to H-mode plasma experiment via Passive-Active Multijunction (PAM) launcher carried out. coupled power has been increased much from 470kW 1400kW since 2014. LHW became more important discharges past 4 years. In 2018, 1.1s ELMy achieved with help of Neutral Beam Injection (NBI)...