A5031670733- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Laser-Plasma Interactions and Diagnostics
- Diamond and Carbon-based Materials Research
- Particle accelerators and beam dynamics
- Metal and Thin Film Mechanics
- Solar and Space Plasma Dynamics
- Ion-surface interactions and analysis
- Atomic and Subatomic Physics Research
- Carbon Nanotubes in Composites
- Semiconductor materials and devices
- Nuclear Physics and Applications
- Graphene research and applications
- Advanced materials and composites
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Magnetic Field Sensors Techniques
- Electromagnetic Launch and Propulsion Technology
- Physics of Superconductivity and Magnetism
- Dust and Plasma Wave Phenomena
- Advanced Materials Characterization Techniques
- Real-time simulation and control systems
University of Saskatchewan
2016-2025
University of Science and Technology of China
2014-2024
Second Affiliated Hospital of Zhengzhou University
2024
Shenzhen University
2024
ShanghaiTech University
2024
Institute of Plasma Physics
2012-2022
Chinese Academy of Sciences
2012-2022
University of California, Los Angeles
2016-2022
Tsinghua University
2015
University of Wisconsin–Madison
2003-2004
We report the results of an experimental and theoretical international project dedicated to study quasi-single helicity (QSH) reversed field pinch (RFP) plasmas. The has involved several RFP devices numerical codes. It appears that QSH spectra are a robust feature common all experiments. Our expand reinforce evidence formation self-organized states with one dominant helical mode (Ohmic SH state) is approach complementary active control magnetic turbulence improve confinement in steady state RFP.
<title>Abstract</title> An analysis of the statistical spectral characteristics resonant magnetic perturbations (RMPs), geodesic acoustic modes (GAMs), and their nonlinear coupling with ambient turbulence in edge region HL-2A tokamak has been performed. Experimental observations reveal that RMPs significantly affect low-frequency fluctuations large-scale turbulence. We present first direct evidence increasing RMP current weakens between GAMs other frequency modes. Specifically, amplitude...
A novel all-fiber optic current sensor (FOCS) is designed specifically for the measurement of large transient currents based on Faraday effect. reciprocal symmetric structure incorporated into optical sensing loop, and dependent phase demodulation achieved by using a passive fiber coupler homodyne detection scheme. This design offers several advantages, including structural simplicity, high voltage insulation, low noise, linearity, excellent frequency response, highly suitable use in any...
Energy confinement comparable with tokamak quality is achieved in the Madison Symmetric Torus (MST) reversed field pinch (RFP) at a high beta and low toroidal magnetic field. Magnetic fluctuations normally present RFP are reduced via parallel current drive outer region of plasma. In response, electron temperature nearly triples doubles. The time increases ten-fold (to ∼10 ms), which L- H-mode scaling values for same plasma current, density, heating power, size shape. Runaway evidenced by...
The Keda Torus eXperiment (KTX) is a medium-sized reversed field pinch (RFP) device under construction at the University of Science and Technology China. KTX has major radius 1.4 m minor 0.4 with an Ohmic discharge current up to 1 MA. expected electron density temperature are, respectively, 2 × 1019 m−3 800 eV. A combination stainless steel vacuum chamber thin copper shell (with penetration time 20 ms) surrounding plasma provides opportunity for studying resistive wall mode instabilities....
Characterization of water‐conducting porosity at and near saturation is required in understanding rainfall snowmelt infiltration runoff as well chemical transport soil. There are methods available to quantify situ, but with serious limitations. The objective this paper was present a general equation for based on ponded‐ tension‐infiltration measurements. Some analytical solutions developed specific unsaturated hydraulic conductivity functions such the Gardner's exponential rational power...
The resonant interaction between magnetohydrodynamic (MHD) instability modes and the externally applied helical magnetic field is demonstrated in Saskatchewan Torus-Modified (STOR-M) tokamak. study conducted both numerically experimentally using a 2D MHD equilibrium code former an ( l = 2, n 1) coil carrying short current pulse latter. It shown that can efficiently suppress islands resonating on m surface when value of safety factor at plasma edge relatively low (⩽4). also found (2, are...
Compact torus injection into the Saskatchewan Torus-Modified [Phys. Fluids B 4, 3277 (1992)] tokamak discharges has triggered improved confinement characterized by an increase in electron density more than twofold, 30% reduction Hα radiation level, significant suppression of floating potential fluctuations and m=2 Mirnov oscillations. In this paper, we present detailed experimental setup results, as well extended theory explaining mechanism for triggering a compact injection.
The retarding field energy analyzer (RFA) is a simple and reliable diagnostic technique to measure the ion temperature in scrape-off layer edge of magnetic fusion devices. Design operation features single-sided (facing flow) RFA for measurements Saskatchewan Torus-Modified (STOR-M) tokamak are described. Its compact size (21 x 15 20 mm3) allows without perturbing plasma significantly. Both electron have been measured by STOR-M tokamak. A method proposed correct effects flow on using...
The fast electron flux driven by Lower Hybrid Wave (LHW) in the scrape-off layer (SOL) EAST is analyzed both theoretically and experimentally. five bright belts flowing along magnetic field lines SOL hot spots at LHW guard limiters observed charge coupled device infrared cameras are attributed to flux, which directly measured retarding analyzers (RFA). current carried ranging from 400 6000 A/m2 direction opposite plasma current, scanned radial limiter surface position about 25 mm beyond...
The Keda Torus eXperiment (KTX) is a new reversed field pinch (RFP) device at the University of Science and Technology China. construction assembly KTX, including vacuum chamber, conducting shell, magnetic windings, power supply system, active control coils, pump data acquisition have been completed on August 1, 2015. Immediately following that, first plasma was obtained 15, Intensive conditioning machine underway to ramp up current toward its full operation. An feedback mode system has...
A novel feature of the H-mode induced by compact torus injection on STOR-M tokamak is observed. There almost no change in radial electric field profiles during and after L-H transition. The usual hypothesis E x B shear stabilization mechanism therefore unlikely to play a role this new microinstabilities parallel flow suggested as plausible cause for transition improved regime.
We describe in this Letter the first measurement of multiple islands core a reversed field pinch (RFP). These appear with current profile modification leading to magnetic fluctuation reduction Madison symmetric torus RFP. Magnetic island widths decrease an unprecedented level, reducing overlap adjacent and allowing distinct appear. The structures are observed multichord measurements soft-x-ray emissivity. data is validated Poincaré reconstructions structure core.
Well-aligned graphitic nanocones were synthesized on polished pristine p-type (100) silicon wafers through plasma enhanced hot filament chemical vapour deposition. The field electron emission properties investigated using anode probes of different diameters. Non-linearity was observed in the (FEE) Fowler–Nordheim (FN) plots at high electric field. numerical calculations based superposition two types characteristic sites are consistent with experimental data. non-linearity FN plot may be...