A5061490391- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Solar and Space Plasma Dynamics
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Radiation Dose and Imaging
- Radiation Therapy and Dosimetry
- Photonic and Optical Devices
- Physics of Superconductivity and Magnetism
- Microwave Engineering and Waveguides
- Atomic and Subatomic Physics Research
- Radio Frequency Integrated Circuit Design
- Gyrotron and Vacuum Electronics Research
- Advanced Radiotherapy Techniques
- Silk-based biomaterials and applications
- Ocular Surface and Contact Lens
- Machine Fault Diagnosis Techniques
- Photonic Crystals and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Digital Radiography and Breast Imaging
- Plasmonic and Surface Plasmon Research
- Engineering Diagnostics and Reliability
Beijing Tongren Hospital
2025
Capital Medical University
2025
Zhongyuan University of Technology
2025
Southwestern Institute of Physics
2016-2024
University of Electronic Science and Technology of China
2008-2022
Chinese Academy of Medical Sciences & Peking Union Medical College
2019
Hubei University of Science and Technology
2019
Mallinckrodt (United States)
2011-2017
Washington University in St. Louis
2011
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...
A novel 16-channel fixed frequency Doppler backward scattering (DBS) reflectometer system has been developed on the HL-2A tokamak. This is based filter-based feedback loop microwave source (FFLMS) technique, which lower phase noise and power variation compared with present tunable generation comb array techniques [J. C. Hillesheim et al. Rev. Sci. Instrum. 80, 083507 (2009) W. A. Peebles 81, 10D902 (2010)]. The DBS comprised of four × four-frequency transmitters direct quadrature...
The radial profiles of perpendicular flows in the presence magnetic island were firstly measured HL-2A tokamak by hopping work frequency Doppler backward scattering reflectometer system along with a two-dimensional electron cyclotron emission imaging diagnostic identifying locations. It has been observed that across O-point cut flow is quite small at center and strongly enhanced around boundary island, resulting large increase shear outer half while X-point almost flat whole region....
Rolling Bearings are important supporting components of rotating machines in industrial processes; the faults rolling bearings will cause deterioration operation conditions machines. How to effectively extract fault features and identify modes quickly accurately has become a key issue for safe In this paper, novel hybrid diagnosis method an optimized random forests classifier is proposed. Firstly, original vibration signals decomposed by recursive variational mode decomposition (RVMD),...
Impurity seeding experiments in ELMy H-mode plasmas by using supersonic molecular beam injection (SMBI) have been performed the HL-2A tokamak. Besides pure impurity gas (neon, argon), impurities mixed with main ion fuelling different ratios were seeded into plasma. It has observed that ELM behavior and plasma confinement are very sensitive to ratio. For 30% Ne seeding, large ELMs replaced high frequency bursts (HFBs), which higher smaller amplitude compared peak heat load on divertor plate...
Over the past several years, high-
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 The evolutions of MHD instability behaviors and enhancement both electrostatic electromagnetic turbulence towards the plasma disruption have been clearly observed in HL-2A plasmas. Two types disruptive discharges investigated for similar equilibrium parameters: one with a distinct stage small central temperature collapse ( $$\sim$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>∼</mml:mo> </mml:math> 5–10%) around 1 millisecond before thermal quench (TQ), while...
Purpose The purpose of this study was to investigate and characterize the performance a Multi Leaf Collimator ( MLC ) designed for Cobalt‐60 based MR ‐guided radiation therapy system in 0.35 T magnetic field. Methods design unique assembly features ViewRay MRI dian were first reviewed. RF cage shielding motor cables evaluated using ACR phantoms with real‐time imaging quantified by signal‐to‐noise ratio. dosimetric characterizations, including leaf transmission, penumbra, tongue‐and‐groove...
A liquid crystal small molecule donor BTR-Cl, which has strong self-assembly and crystallinity, is used as the third component to construct nonfullerenes ternary solar cells together with a broad-band polymer D18-Cl low-band acceptor N3. The introduction of BTR-Cl enhances morphology, exciton dissociation, charge mobility blends, improves short-circuit current density fill factor, results in an efficiency up 17.92%. Further show that acts energy level mediator, fluorescence resonance...
Turbulent fluctuations within a quasi-coherent frequency range (peak of ~ 130 kHz, ∆f ≈ tens kHz) are modulated by the rotation low tearing modes in core HL-2A ohmic plasmas. The (QCMs) emerge outside island boundary as O-point passes large cases (w > 4.5 cm), where local electron temperature profile is steepened. Statistical analysis shows that for QCM excitation, threshold value gradient identified and solely observed density discharges, consistent with linear confinement regime. These...
Research on beta induced Alfvén eigenmodes (BAEs) driven by energetic ions has been carried out the HL-2A tokamak. The BAEs can be observed in cases of being beyond or below unity. mode frequencies are around 60–95 kHz. radial structures have detected multi-channel microwave reflectometer and soft x-ray arrays. results suggest that highly localized at normalized radius –0.26. Theoretical analyses based general fishbone-like dispersion relation code support experimental measurements both...
This study investigates the reflectance of defective mode (DM) and lateral shift reflected beam in photonic crystals incorporated with single-layer graphene by transfer matrix method (TMM). Graphene, treated as an equivalent dielectric a thickness 0.34 nm, was embedded center defect layer. The DM greatly enhanced intraband transition electrons converted to interband graphene. could be further increasing Bragg periodic number. Furthermore, large also induced around DM. may find great...
Toroidal Alfvén eigenmodes (TAEs) driven by fast ions during neutral beam injection heating have been observed on HL-2A. TAEs are found to be excited the sideband resonance between and shear waves. Their frequencies range from 90 kHz 200 kHz, toroidal mode numbers of most unstable n = 1–3. Nonlinear behaviours TAEs, such as frequency chirping, pitch-fork splitting, nonlinear mode-mode coupling, also excited. In down-chirping case, show typical ballooning structures their amplitudes around...
Dedicated experiments have been carried out at the J-TEXT tokamak for investigating plasma responses to externally applied resonant magnetic perturbation (RMP) field with various RMP currents under four different toroidal phases. After its penetration, dominant component of resonated q = 2 surface and excited an m/n 2/1 island, which rotated poloidally when changing phase RMP. The experimental results show significant influence on perpendicular rotations, density fluctuations geodesic...
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 Doppler backward scattering (DBS) reflectometer has become a well-established and versatile diagnostic technique for the measurement of density fluctuations flows in magnetically confined fusion experiments. In this work, novel multiple fixed-frequency array source with multiplexer is developed applied multi-channel DBS system. details system design laboratory tests are presented. Preliminary results shift frequency spectra measured by systems obtained. Characteristics plasma rotation...
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 An ion cyclotron emission (ICE) diagnostic, which is based on a B-dot probe, has been recently designed and installed HL-2A tokamak. The diagnostic used to study various high-frequency magnetic field fluctuations can be excited by energetic ions runaway electrons in the plasma. ICE includes direct current (DC) block, radio frequency splitters, filter bank power detectors. composed of 16 channels filters, with center covering from 10 160 MHz, MHz step length 8 bandwidth. log...
Normalize the response of electronic portal imaging device (EPID) is first step toward an EPID-based standardization Linear Accelerator (linac) dosimetry quality assurance. In this study, we described approach to generate two-dimensional (2D) pixel sensitivity maps (PSM) for EPIDs normalization utilizing alternative beam and dark-field (ABDF) image acquisition technique large overlapping field irradiations. The automated was performed by XML-controlled machine operation PSM generated based...
As the plasma beta (β) increases in high-performance tokamaks, electromagnetic turbulence becomes more significant, potentially constraining their operational range. To investigate this turbulence, a cross-polarization scattering (CPS) diagnostic system is being developed on HL-3 tokamak for simultaneous measurements of density and magnetic fluctuations. In work, quasi-optical has been designed analyzed Q-band CPS diagnostic. The includes lens group beam waist size optimization, rotatable...
Abstract A divertor detachment with sustainable high-performance plasmas has been achieved through nitrogen seeding in the HL-2A tokamak. The closed structure facilitates achieving high neutral pressure due to its efficient particle containment effect as demonstrated by both experimental and SOLPS simulation results, which aids detachment. radiative is conducive high-frequency small edge localized modes (ELMs) operation, characterized a reduced pedestal ion temperature gradient <mml:math...