A5074406196- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Nuclear reactor physics and engineering
- Fusion materials and technologies
- Geophysical and Geoelectrical Methods
- NMR spectroscopy and applications
- Diamond and Carbon-based Materials Research
- Laser-Plasma Interactions and Diagnostics
- Electrostatic Discharge in Electronics
- Laser-induced spectroscopy and plasma
- Fluid Dynamics and Turbulent Flows
- Model Reduction and Neural Networks
Qiqihar University
2025
Huazhong University of Science and Technology
2021-2024
State Key Laboratory of Advanced Electromagnetic Engineering and Technology
2024
Abstract We report on comprehensive experimental studies of turbulence spreading in edge plasmas. These demonstrate the relation and entrainment to intermittent convective density fluctuation events or bursts (i.e. blobs holes). The non-diffusive character is thus elucidated. velocity (or mean jet velocity) manifests a linear correlation with skewness fluctuations, increases auto-correlation time fluctuations. Turbulence by positive fluctuations outward, while negative inward. degree...
Abstract On the J-TEXT tokamak, dynamics of edge magnetic topology during opening islands induced by external Resonant Magnetic Perturbation (RMP) are investigated. The island chain is pushed outward increasing plasma toroidal current to intersect poloidally and toroidally localized divertor plate, forming an open in Scrape-Off Layer (SOL). location strike points on plate predicted HINT code agreement with experimental observations. influence profiles has also been investigated using...
The phenomena of island healing and configuration transition induced by high-power electron cyclotron resonance heating (ECRH) have been investigated in the divertor on J-TEXT tokamak. Experimental results reveal that size edge open magnetic with mode number m/n = 3/1 decreases substantially under specific ECRH conditions. This process, referred to as healing, occurs when a power 500~600 kW is deposited plasma core or 250 at r 0.5 a, where minor radius. reduction width makes ineffective into...
Abstract The phenomena of island healing and configuration transition induced by high-power electron cyclotron resonance heating (ECRH) have been investigated in the divertor on J-TEXT tokamak. Experimental results reveal that size edge open magnetic with mode number m/n = 3/1 decreases substantially under specific ECRH conditions. This process, referred to as healing, occurs when a power 500~600 kW is deposited plasma core or 250 at r_EC 0.5 a, where minor radius. reduction width makes...
The strong genotype dependence of embryogenic callus (EC) induction limits the high-frequency regeneration Korean pine (Pinus koraiensis) via somatic embryogenesis (SE). We examined morphological and histocytological features various types using external morphology, microstructure, ultrastructure analyses. To assess their potential, we conducted (SE) experiments. Additionally, investigated programmed cell death (PCD) events associated with genotype-dependent formation in by performing TUNEL...
Abstract Collapse of the edge flow shear as line-averaged density approaches Greenwald limit has been observed a precursor to enhanced particle flux characteristic proximity regime. Here, we report use biased electrode sustain layer in high discharges, which would otherwise collapse. A stable increase is along with strong density. These experiments were carried out on J-TEXT tokamak. The Reynolds stress at enhanced, and zonal sustained, while perturbation levels, turbulence internal energy...
Abstract Experimental studies of the dynamics shear flow and turbulence spreading at edge tokamak plasmas are reported. Scans line-averaged density plasma current carried out while approaching Greenwald limit on J-TEXT tokamak. In all scans, when fraction <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi>f</mml:mi> <mml:mtext>G</mml:mtext> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo> <mml:mover> <mml:mi>n</mml:mi> <mml:mo...
Abstract For the first time, an island divertor configuration was successfully implemented in J-TEXT tokamak to improve heat exhaust and impurity control. The magnetic is generated by applying external resonant perturbation fields, intersection between edge target then controlled adjusting safety factor q a , thereby achieving configuration. overall confinement maintained spite of loss volume. significantly reduces peak heat-load on approximately 50% improves screening. Additionally, it...
Abstract Developing advanced magnetic divertor configurations to address the coupling of heat and particle exhaust with impurity control is one major challenges currently constraining further development fusion research. It has therefore become focus extensive attention in recent years. In J-TEXT, several new configurations, including high-field-side single-null poloidal island divertor, as well their associated fundamental edge plasma physics, have recently been investigated. The purpose...
Abstract In order to measure boundary electrostatic and magnetic fluctuations simultaneously, a combined Langmuir-magnetic probe (CLMP) has been designed built on joint-Texas experimental tokamak. The consists of 8 graphite pins 3D probe, driven by mechanical pneumatic device. By means simulation, the shielding effect sleeve fluctuation signal is explored, influence eddy current was reduced cutting sleeve. experiment, it verified that mutual inductance electromagnetic signals can be ignored,...
Abstract Experiments conducted on the J-TEXT tokamak have provided first evidence that Beta-induced Alfvén Eigenmode (BAE) is localized inside isolated helical flux tube of its edge m / n = 3/1 magnetic island. The observations show BAE forms a standing wave island, with nodes located at X- and O-points When island cut open by contact limiter plates, found to remain remnant closed in Scrape-Off Layer, but amplitude decreases as width becomes smaller.
Abstract It is observed in EAST that the non-axisymmetric helical currents induced by lower hybrid waves (LHWs) scrape-off layer (SOL) can produce resonant magnetic perturbations (RMPs), hence mitigate edge-localized modes (ELMs) significantly and cause strike points splitting. In this work, SOL current driven an alternative method, i.e. biased electrode, shown to influence plasma boundary, especially points, divertor configuration on J-TEXT. With positive bias upper target plate split as...
A recently developed plasma-wall self-organization (PWSO) model predicts a significantly enhanced density limit, which may be attainable in tokamaks with ECRH-assisted ohmic startup and sufficiently high initial neutral density. Experiments have been conducted on J-TEXT to validate such limit scenario based this model. Experimental results demonstrate that increasing the pre-filled gas pressure or ECRH power during phase can effectively enhance plasma purity raise at flat-top. Despite...
This article presents an in-depth study of the sequence events leading to density limit disruption in J-TEXT tokamak plasmas, with emphasis on boudary turbulent transport and high-field-side high-density (HFSHD) front. These phenomena were extensively investigated by using Langmuir probe Polarimeter-interferometer diagnostics.
Abstract Accurate measurement of the average plasma parameters in edge region, including temperature and density electrons ions, is critical for understanding characteristics scrape-off layer (SOL) divertor transport magnetically confined fusion research. On J-TEXT tokamak, a multi-channel retarding field analyzer (RFA) probe has been developed to study region under various poloidal island configurations. The radial profile ion-to-electron ratio, τ i/e , determined, which gradually decreases...
Abstract Recently, the geodesic acoustic modes (GAMs) induced by negative electrode biasing (EB) are first observed in J-TEXT tokamak, and electrostatic magnetic fluctuation characteristics of GAM ambient turbulence (AT) measured combined Langmuir-magnetic probe (CLMP). The experimental results show that with ramped up biasing, mean flow shear gradually strengthens, excites a high-frequency (H-GAM) low-frequency (L-GAM) frequencies 24kHz 17kHz respectively. With effects Er×B EB E ̃r×B GAMs,...