A5046060947- Magnetic confinement fusion research
- Advanced X-ray Imaging Techniques
- Laser-induced spectroscopy and plasma
- X-ray Spectroscopy and Fluorescence Analysis
- Laser-Plasma Interactions and Diagnostics
- Atomic and Molecular Physics
- Analytical chemistry methods development
- Ionosphere and magnetosphere dynamics
- Optical Systems and Laser Technology
- Optical Coatings and Gratings
- Cultural Heritage Materials Analysis
- Adaptive optics and wavefront sensing
- Crystallography and Radiation Phenomena
- Atomic and Subatomic Physics Research
- Electron and X-Ray Spectroscopy Techniques
- High-Temperature Coating Behaviors
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Atmospheric Ozone and Climate
- Medical Imaging Techniques and Applications
- Advanced Measurement and Metrology Techniques
- Fusion materials and technologies
- Superconducting Materials and Applications
- Mercury impact and mitigation studies
- Calibration and Measurement Techniques
University of Science and Technology of China
2014-2024
National Synchrotron Radiation Laboratory
2012-2024
Chinese Academy of Sciences
2018
Institute of Plasma Physics
2018
Beijing University of Technology
2011
Charge eXchange Recombination Spectroscopy (CXRS) and Beam Emission (BES) diagnostics based on a heating neutral beam have recently been installed EAST to provide local measurements of ion temperature, velocity, density. The system design features common light collection optics for CXRS BES, background channels the toroidal views, multi-chord viewing sightlines, high throughput lens-based spectrometers with good signal noise ratio time resolution measurements. Additionally, two each has...
A multi-line internal standard calibration method is proposed for the quantitative analysis of carbon steel using laser-induced breakdown spectroscopy (LIBS). procedure based on was adopted to select best curves and corresponding emission lines pairs automatically. Laser-induced experiments with samples were performed, C, Cr, Mn analyzed via method. Calibration these elements constructed a traditional single line The obtained evaluated determination coefficient, root mean square error...
Carbon content detection is an essential component of the metal-smelting and classification processes. An obstacle in carbon by laser-induced breakdown spectroscopy (LIBS) steel interference lines adjacent Fe lines. The emission line C(I) 247.86 nm generally has higher response transmission efficiency than 193.09 nm, but it blends with Fe(II) line. Therefore, this study proposes a method back propagation (BP) neural network modeling, which incorporates genetic algorithm (GA), evaluates...
A two-crystal X-ray spectrometer system has been implemented in the EAST tokamak to simultaneously diagnose high- and low-temperature plasmas using He- H-like argon spectra. But for future fusion devices like ITER Chinese Fusion Engineering Test Reactor (CFETR), ions become fully stripped core intensity of lines will be significantly at high temperatures (Te > 5 keV). With increasing auxiliary heating power on EAST, plasma temperature could also reach keV higher. In such conditions, use a...
This study investigated the rapid identification of ceramics via laser-induced breakdown spectroscopy (LIBS) to realize ancient from different regions. Ceramics regions may have large differences in their elemental composition. Thus, using LIBS technology for ceramic is feasible. The spectral intensities 11 common elements, namely, Si, Al, Fe, Ca, Mg, Ti, Mn, Na, K, Sr, and Ba, were selected as classification indices. Principal component analysis (PCA) kernel principal (KPCA) combined with...
A portable spectrometer prototype is built to study wavelength calibration for flat-field grating spectrometers. An accurate method called parameter fitting presented. Both optical and structural parameters of the are included in model, which accurately describes relationship between pixel position. Along with higher accuracy, proposed can provide information about errors installation components, will be helpful alignment.
Spatial profiles of impurity emission measurements in the extreme ultraviolet (EUV) spectroscopic range radiofrequency (RF)-heated discharges are combined with one-dimensional and three-dimensional transport simulations to study effects resonant magnetic perturbations (RMPs) on core accumulation at EAST. The amount line mitigation by RMPs appears be correlated ion Z for lithium, carbon, iron tungsten monitored, i.e. stronger suppression heavier ions. targeted effect most detrimental high-...
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...
Spectroscopy in the soft X-ray and extreme ultraviolet (XEUV) region is very important magnetic fusion research. Recently, two flat-field spectrometers that utilize a varied line spacing grating to image spectra of 1-13 nm 5-50 were installed on EAST for core impurity emission monitoring transport study. The instruments proven be capable observing spectral lines from low-Z impurities (Li, C, O, N, Ar, etc.) highly ionized medium- high-Z (Fe, Cr, Ni, Cu, Mo, etc.). For example, wavelength...
The impurity radiation from the divertor region of EAST tokamak is dominantly in wavelength range vacuum ultraviolet (VUV) due to elevated edge electron temperature. A space-resolved VUV spectroscopy developed measure region. An eagle-type spectrometer with a focal length 1 m adopted this system, equipped spherical grating and charged-coupled device (CCD) detector. performance preliminarily tested on synchrotron facility. calibration conducted near 65 nm. It found that observed by CCD...
A Kirkpatrick-Baez (KB) x-ray microscope has been developed for the diagnostics of inertial confinement fusion (ICF). The KB system works around 2.5keV with magnification 20. It consists two spherical multilayer mirrors. grazing angle is 3.575° at 2.5keV. influence slope error optical components and alignment errors simulated by SHADOW software. mechanical structure which can perform fine tuning designed. Experiment result Manson source shows that spatial resolution about 3-4μm over a field...
Laser-induced breakdown spectroscopy has become a general-purpose technique, and internal standard calibration is common method for quantitative analysis. Calibration models should be reconstructed different systems application environments. This study presents an efficient procedure in the construction selection of LIBS The concludes data preprocess, model construction, concentration calculation. These steps can programmed without manual intervention. Results analysis Ni-based alloys using...
A grating groove density measuring system based on diffraction method has been developed to measure the two-dimensional variations of VLS gratings at NSRL. The can provide not only basic data for evaluating imaging properties grating, but also an important tool improving manufacturing technology. commercially available concave with a curvature radius 750 mm was measured test accuracy system. Results show that (ΔN/N) about 5 × 10−5. Then variation parameters 1200lines/mm plane used in NSRL is...