A5112501742- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Advanced X-ray and CT Imaging
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Advanced X-ray Imaging Techniques
- Radiomics and Machine Learning in Medical Imaging
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Power Transformer Diagnostics and Insulation
- Advancements in Photolithography Techniques
- Non-Destructive Testing Techniques
- Nuclear Physics and Applications
- Magnetic Field Sensors Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Subatomic Physics Research
- GNSS positioning and interference
- Fluid Dynamics and Heat Transfer
- Advanced Electron Microscopy Techniques and Applications
- Electrohydrodynamics and Fluid Dynamics
Minzu University of China
2025
Institute of High Energy Physics
2022-2024
Chinese Academy of Sciences
2022-2024
University of Science and Technology of China
2015-2021
A previously disregarded electrohydrodynamic (EHD) instability pattern at the gas–liquid interface caused by charge injection is elaborately described and identified as classical EHD instability. The characteristics evolutionary processes of three classic patterns were meticulously experimentally. Taylor cone-like conical structure proposed common basis for formation all these patterns. direct numerical model based on coupled hydrodynamic electrodynamic equations developed, evolution free...
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...
Abstract The Keda Torus eXperiment (KTX) is still operated in the commissioning phase, and preparation for operation capability of KTX phase II upgrade underway. diagnostics have been greatly developed: (1) terahertz interferometer has upgraded to seven chords electron density profile inversion; (2) a Thomson scattering system with 5 Joule laser installed progress; (3) 3D movable probe developed electromagnetic turbulence measurement; (4) double-foil soft x-ray imaging set up bench test...
An optical fiber Mach–Zehnder interferometer at a wavelength of 1.55 µm has been developed for measurements high electron density on compact torus (CT) plasmas with time resolution 0.1 µs and phase 6.4 × 10−4 rad. To improve measurement accuracy, the noise investigated in detail optimized. In bench test, was calibrated using piezoelectric ceramic actuator known stroke. Initial results CT plasma show that provides reliable two spatial locations bulk velocity can be determined by method flight.
Synchrotron radiation X-ray Computed Tomography(CT) imaging is an effective means of non-destructively revealing the internal structure samples. To obtain high-quality reconstructed slices, number projections should be at least π2Ndetector (Ndetector detector pixels occupied by sample diameter). Acquiring excessive leads to high doses and long scanning time. Insufficient projections, falling below Nyquist sampling criterion, result in significant streaking artifacts. This paper proposes a...
High-pixel-number synchrotron radiation computed tomography (CT) has the advantages of high sensitivity, resolution, and a large field view. It been widely used in biomedicine, cultural heritage research, non-destructive testing, other fields. The Nyquist sampling theorem states that when detector’s pixels per row are increased, it requires more CT projections, resulting lengthened scan time increased damage. Sparse-view can significantly reduce damage improve projection data acquisition...
An equilibrium field (EQ) power supply (PS) circuit using a feedback H-bridge pulse-width-modulation controller has been developed to control the plasma horizontal position and satisfy requirement of in Keda Torus eXperiment (KTX) reversed pinch. Results from simulations discharge aimed at achieving demonstrate success PS design. Additionally, this design provides feasible solution for conditions future KTX upgrades. The details EQ model poloidal are presented discussed technical note.
The inward transport flux accompanied by the long-lived mode (LLM) has been observed edge Langmuir probe array during L-H transition in HL-2A tokamak. cross phase between poloidal electric field fluctuation and electron density LLM frequency changed greatly transition, which led to radial change its direction a given region near pedestal barrier. By using long distance correlation method, shift of proved be key reason, cross-phase term frequency. Furthermore, shear effect mode-selecting...
In synchrotron radiation X-ray imaging, the imaging field of view and spatial resolution are mutually restricted, which makes it impossible to have both a large high when carrying out experiments. Constructing an oversampled image through micro-scanning method using deconvolution algorithm eliminate point spread function introduced by pixel overlap can increase under fixed view, thereby improving ratio resolution. this paper, numerical simulation experiments carried with different number...
Abstract The inward particle flux associated with the global long-lived mode (LLM) during L–I–H transition on HL-2A tokamak has been measured. arises from phase change between density and radial velocity fluctuations, where fluctuations are strongly correlated magnetic of LLM. Moreover, its gradient rather than poloidal flow shear play an important role in transport large-scale mode. strong nonlinear coupling LLM ambient turbulence confirmed, this may contribute to most I-phase state.
Due to the discrete nature of saddle coils for active feedback control plasma instabilities, emergence sideband modes is inevitable. In Keda Torus eXperiment (KTX), edge Mirnov are unevenly distributed on inner surface vacuum vessel suppress modes. These arrays used system KTX. They also magnetohydrodynamics (MHD) mode identification, which a fundamental and significant method distinguish describe instabilities. A set suitable MHD analysis methods has been utilized complete detection,...
A two-color homodyne Mach–Zehnder (M–Z) optical fiber interferometer with wavelengths of 1.55 and 1.31 µm was developed for long-time measurement line-integrated plasma electron density. novel phase difference demodulation algorithm based on a single 3 × coupler implemented in scheme the first time. Our laboratory tests showed that this new could determine shift due to low-frequency ambient vibration maintain high resolution measurement. The less than 0.04 rad 1000 s, corresponding...
A 10-channel <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">H</mml:mi> </mml:mrow> <mml:mi>α</mml:mi> </mml:msub> </mml:math> diagnostic system has been designed with the rapid response rate of 300 kHz, spatial resolution about 40 mm, and overlap between adjacent channels 3%, it implemented successfully on Keda Torus eXperiment (KTX), a newly constructed, reversed field pinch (RFP) experimental device at...
In-line X-ray phase contrast imaging, which is simple to experiment with, provides significantly higher sensitivity, compared conventional absorption imaging. The inversion of the relationship between recorded Fresnel diffraction intensity and shift induced by object called retrieval. transport equation (TIE), a method retrieval, solved fast Fourier transform algorithm proposed Paganin et al., has been widely adopted. However, existing suffers from excessive suppression high-frequency...
We have developed a parametric method for eliminating the background component of plasma current, which is measured by Rogowski coil and polluted toroidal magnetic field in vacuum vessel Keda Torus eXperiment (KTX) reversed pinch (RFP) device. The considers windings, KTX chamber, as linear time-invariant system; this case, constant frequency response function characterizes system. Using function, current caused pollution from can be predicted exactly an arbitrary input to windings. Compared...
In the synchrotron radiation tomography experiment, sparse-view sampling is capable of reducing severe damages samples from X-ray, accelerating rate and decreasing total volume experimental dataset. Consequently, CT reconstruction has been a hot topic nowadays. Generally, there are two types traditional algorithms for reconstruction, i.e., analytic iterative algorithms. However, widely used usually lead to stripe artifacts in reconstructed images, due Nyquist rule not satisfied. While more...