A5110603733- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Solar and Space Plasma Dynamics
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Physics of Superconductivity and Magnetism
- Anomaly Detection Techniques and Applications
- Metallurgical Processes and Thermodynamics
- Time Series Analysis and Forecasting
- Gyrotron and Vacuum Electronics Research
- HER2/EGFR in Cancer Research
- Heat Transfer and Boiling Studies
- Heat Transfer and Optimization
- Nuclear Physics and Applications
- Reservoir Engineering and Simulation Methods
- Geomagnetism and Paleomagnetism Studies
- Atomic and Subatomic Physics Research
- Galectins and Cancer Biology
- Rheology and Fluid Dynamics Studies
- Microstructure and Mechanical Properties of Steels
- Toxin Mechanisms and Immunotoxins
- Dust and Plasma Wave Phenomena
North China University of Water Resources and Electric Power
2025
Chinese Academy of Sciences
2016-2024
Institute of Plasma Physics
2016-2024
Hefei Institutes of Physical Science
2023-2024
University of Science and Technology of China
2017-2021
Evidence of a nonlinear transition from mitigation to suppression the edge localized mode (ELM) by using resonant magnetic perturbations (RMPs) in EAST tokamak is presented. This first demonstration ELM with RMPs slowly rotating plasmas dominant radio-frequency wave heating. Changes topology after are indicated gradual phase shift plasma response field linear magneto hydro dynamics modeling result vacuum one and sudden increase three-dimensional particle flux divertor. The threshold depends...
A set of in-vessel resonant magnetic perturbation (RMP) coil has been recently installed in EAST. It can generate a range spectrum, and there is relatively large window for edge localized mode (ELM) control according to the vacuum field modeling island overlapping area. Observation mitigation suppression ELM slow rotating plasmas during application an n = 1 RMP presented this paper. Strong effect observed neutral beam injection heating plasmas. The frequency increases by factor 5, crash...
The heat transferred through vertical plane layers by free convection was measured as a function of the temperature difference across layer, height and its thickness. Heat transfer coefficients are reported for fluids having Prandtl numbers from 3 to 30,000. An analysis problem means integral equations yielded results which differed no more than 12 percent data in range were applicable.
Controlling the steady state particle and heat flux impinging on plasma facing components, as one of main concerns future fusion reactors, is still necessary when transient power loads induced by edge localized modes (ELMs) have been eliminated resonant magnetic perturbations (RMPs) in high confinement tokamak experiments. This especially true for long pulse operation. One promising solution to use rotating perturbed field. Recently differential phase scans n = 1 2 RMP fields operated first...
Abstract The plasma-beta effect on the n = 1 resonant magnetic perturbation (RMP) field penetration in purely radio-frequency (RF) wave heated discharges has been investigated EAST. experimental results show that dependence of threshold RMP coil current for penetration, <?CDATA $I_{\textrm {RMP,th}}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>I</mml:mi> <mml:mrow> <mml:mtext>RMP,th</mml:mtext> </mml:mrow> </mml:msub> </mml:math> , total...
Abstract Intrinsic error field on EAST is measured using the ‘compass scan’ technique with different n = 1 magnetic perturbation coil configurations in ohmically heated discharges. The intrinsic a non-resonant dominated spectrum even connection of upper and lower resonant coils order <?CDATA ${{b}_{r2,1}}/{{B}_{\text{T}}}\simeq {{10}^{-5}}$ ?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mstyle displaystyle="false"> <mml:msub> <mml:mrow> <mml:mi>b</mml:mi>...
Density scaling of error field penetration in EAST is investigated with different n = 1 magnetic perturbation coil configurations ohmically heated discharges. The density scalings thresholds under two spectra are and , where br the ne line averaged electron density. One difficulty understanding that key parameters other than determining process may also be changed when plasma changes. Therefore, they should determined from experiments. estimated theoretical analysis ( lower region higher...
Abstract The formation of a static 3-Dimensional (3D) helically localized perturbation structure the Toroidal Alfv'en Eigenmode (TAE) is observed for first time under magnetic islands induced by Resonant Magnetic Perturbations (RMP) in tokamak plasmas. Before application RMP, TAE around 200 kHz excited Electron Cyclotron Resonance Heating (ECRH) Energetic Electrons (EEs). After n = 1 mode into helical area on flux surface, where toroidal number. We find strengthened near X points m/n=-3/1...
: Increasing environmental variability and operational complexity in reservoir systems necessitate advanced optimization frameworks for flood control. This study proposes the ε-constrained Improved Zebra Optimization Algorithm (ε-IZOA), a novel metaheuristic algorithm integrating an enhanced (ZOA) with adaptive ε-constraint handling, to address multi-reservoir control optimization. Three strategic modifications advance standard ZOA: (1) Bernoulli chaotic mapping diversified population...
A toroidal Alfvén eigenmode (TAE) excited by barely trapped energetic electrons during the application of a static magnetic perturbations (MPs) is observed for first time in tokamak ohmic heating plasmas. This TAE appears when current n = 2 MPs exceeds threshold value, at which forced reconnection happens. Here, mode number. located near plasma edge, agrees with calculation gap. It propagates ion diamagnetic direction and has dominant number 2. The frequency consistent precessional energy...
Abstract A series of high-frequency ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>400</mml:mn> <mml:mo>∼</mml:mo> <mml:mn>1000</mml:mn> <mml:mrow> <mml:mtext> kHz</mml:mtext> </mml:mrow> </mml:math> ) bursting core-localized Alfvén instabilities have been observed during ohmic discharges in EAST tokamak. The instability trigger favours the discharge conditions low toroidal magnetic field and electron density. mode numbers are mainly <mml:mi>n</mml:mi>...
A new technique for multi-mode plasma response extraction is presented, as well a criterion to identify modes associated with edge localized mode (ELM) control. This extracts by separating the full poloidal cross-section structure from phase difference between upper and lower resonant magnetic perturbation (RMP) coils . The dependence of extracted are compared effect ELM control using both n = 2 3 RMP in wide q95 operating regimes. It shows that highest near pedestal top correlated...
Increasing the density in a tokamak is limited by so-called limit, which generally performed as an appearance of disruption causing loss plasma confinement, or degradation high confinement mode could further lead to H → L transition. The L-mode and H-mode limit has been investigated EAST tokamak. Experimental results suggest that limits be triggered either edge cooling excessive central radiation. cooling, leads current profile shrinkage then destabilizes 2/1 tearing mode, ultimately...
Abstract This paper presents the penetration of n = 2 magnetic field perturbations, where is toroidal mode number. The intrinsic error (IEF) measured in an ohmic heating plasma using compass scan method, i.e. asymmetry threshold current for resonant perturbations (RMPs). Its amplitude 55.5 A equivalent coil or B r,3/2 0.1 G and phase IEF around 170.6° (129°). Phasing scans (scans difference between upper lower currents) RMPs are carried out to obtain e ffects spectrum on penetration....
Abstract An experiment was conducted to study the mode penetration of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>n</mml:mi> <mml:mo>=</mml:mo> <mml:mn>1</mml:mn> </mml:math> resonant magnetic perturbation (RMP) in EAST under low neutral beam injection torque co-current direction (Co-NBI). The experimental results indicate that threshold current <mml:mrow> <mml:msub> <mml:mi>I</mml:mi> <mml:mtext>RMP,th</mml:mtext> </mml:mrow> </mml:msub> for field...
Plasma toroidal rotation acceleration in the co-current direction introduced by n = 1 (toroidal mode number) static resonant magnetic perturbation (RMP) has been observed EAST tokamak. It strongly depends on RMP coil configuration, which is manifested its dependence δϕUL (phase difference between upper and lower coils) current. Modeling results from NTVTOK based linear plasma response modeled MARS-F shows that Neoclassical Toroidal Viscosity (NTV) torque because of dominant contribution...
A space-resolved extreme ultraviolet (EUV) spectrometer has been used to observe the spatial distribution and temporal behavior of core impurity emissions at experimental advanced superconducting tokamak (EAST), evaluating effects resonant magnetic perturbations (RMPs) on concentration. The vertical profiles from 0 ≤ Z 450 mm range results in spectra wavelength 30 Å λ 500 Å. Line carbon, lithium, iron were observed for C VI (33.7 Å, 2p-1s), Li III (135 Fe XXIII (132.9 1s <sup...
The edge localized mode (ELM) has been mitigated by n=1 resonant magnetic perturbation (RMP) in EAST tokamak. turbulence characteristics and transport during the ELM mitigation have measured a series of diagnostics. coherent (ECM) with frequency about 25 kHz almost disappears when is mitigated. scrape-off layer (SOL) radial turbulent four-tip Langmuir probe mounted on manipulator at outer midplane, exhibiting strong enhancement outward particle SOL region (3-25 mm outside LCFS). This...
Abstract Multiple electromagnetic coherent modes with frequencies f ∼ 20–300 kHz and toroidal mode numbers n = 1 2 have been observed investigated in radio-frequency heated H-mode plasmas of the EAST tokamak. The experimental results show that two main branches these are driven by energetic electrons (EEs), which produced processes current drive heating. Bicoherence analysis indicates there strong nonlinear interactions between (mother waves), i.e. one is low-frequency range 20–50 other...
Suppression and mitigation of a high-frequency Alfvén-like mode (HFAM) between type-I edge localized modes (ELMs) during ELM by resonant magnetic perturbation (RMP) is observed for the first time in EAST tokamak. This located near pedestal region. The modeling result Alfvén continuum shows that HFAM elipical eigenmode (EAE) gap. During application n = 1 RMP mitigation, can be fully suppressed when amplitude exceeds threshold, below which mitigated. suppression caused reduction height induced...
Abstract The density scaling of n = 1 error field penetration is investigated under radio-frequency (RF)-dominant heated L-mode discharges in the EAST tokamak. It found that threshold strength for lower-hybrid current drive (LHCD) plasmas about <?CDATA ${b}_{\text{r}}\propto {n}_{\text{e}}^{0.4}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>b</mml:mi> </mml:mrow> <mml:mtext>r</mml:mtext> </mml:msub>...
Abstract A toroidal Alfvén eigenmode (TAE) is excited by electron cyclotron resonance heating (ECRH) induced barely trapped energetic electrons in experimental advanced superconducting tokamak . This TAE appears the low density EAST discharges under pure off-axis ECRH heating. After analysing power modulation local and temperature oscillations, location of this mode deposition are determined. edge localized drifts ion-diamagnetic direction may be driven considering contribution poloidal...