A5024621745- Magnetic confinement fusion research
- Fusion materials and technologies
- Nuclear Physics and Applications
- Plasma Diagnostics and Applications
- Dust and Plasma Wave Phenomena
- Nuclear reactor physics and engineering
- Laser-induced spectroscopy and plasma
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- nanoparticles nucleation surface interactions
- Atmospheric chemistry and aerosols
- Vehicle emissions and performance
- Electrohydrodynamics and Fluid Dynamics
- Photocathodes and Microchannel Plates
- Cold Atom Physics and Bose-Einstein Condensates
- International Science and Diplomacy
- Atomic and Subatomic Physics Research
- Spacecraft and Cryogenic Technologies
- Laser Design and Applications
- Luminescence Properties of Advanced Materials
- Particle Dynamics in Fluid Flows
Korea Institute of Fusion Energy
2009-2021
Fusion (United States)
2015
Fusion Academy
2015
Korea Advanced Institute of Science and Technology
2003-2007
Experiments on trace argon impurity transport in L-mode discharges were performed Korea superconducting tokamak advanced research (KSTAR) with electron cyclotron resonance heating (ECH). Ar emission was measured by soft x-ray (SXR) arrays and vacuum UV (VUV) diagnostics. A significant reduction the core emissivity observed ECH. The largest on-axis became smaller outward positions. diffusivity convection velocity of obtained analysis SXR data SANCO code for ECH non-ECH shots. In case, both...
The Korea Superconducting Tokamak Advanced Research (KSTAR) device has begun deuterium plasma operation and increased neutron generation from D-D fusion reaction in the is expected as heating power of increases. A activation system utilizing pneumatic transfer encapsulated metal samples been implemented to monitor source strength total KSTAR plasma. prototype for ITER was slightly modified be used KSTAR, a High Purity Germanium (HPGe) detection count gamma photons activated samples. Monte...
To optimize the design of ITER vacuum ultraviolet (VUV) spectrometer, a prototype VUV spectrometer was developed. The sensitivity calibration curve calculated from mirror reflectivity, grating efficiency, and detector efficiency. consistent with points derived in experiment using calibrated hollow cathode lamp. For application installed at KSTAR, various impurity emission lines could be measured. By analyzing about 100 shots, strong positive correlation between O VI C IV intensities found.
The neutron activation system (NAS) measures fluence at the first wall and total flux from ITER plasma, providing evaluation of fusion power for all operational phases. pneumatic transfer (PTS) is one key components NAS proper operation system, playing a role transferring encapsulated samples between capsule loading machine, irradiation stations, counting disposal bin. For validation optimization design, prototype PTS was developed tests were performed with system.
Experiments with a small amount of Ar gas injection as trace impurity were conducted in the Korea Superconducting Tokamak Advanced Research (KSTAR) H-mode plasma ( = 2.8 T, 0.6 MA, and 4.0 MW). 170 GHz electron cyclotron resonance heating (ECH) at 600 800 kW was focused along mid-plane fixed major radial position 1.66 m. The emissivity Ar16+ (3.949 ) Ar15+ (353.860 spectral lines measured by x-ray imaging crystal spectroscopy (XICS) vacuum UV (VUV) spectrometer, respectively. ECH reduces...
A vacuum ultraviolet (VUV) spectrometer of a five-channel spectral system is designed for ITER main plasma impurity measurement. To develop and verify the design, two-channel prototype fabricated with No. 3 (14.4-31.8 nm) 4 (29.0-60.0 among five channels. The optical consists collimating mirror to collect light from source slit, two holographic diffraction gratings toroidal geometry, different electronic detectors. For test system, hollow cathode lamp used as source. find appropriate...
At the International Thermonuclear Experimental Reactor (ITER), a neutron activation system is foreseen to measure fluence on first wall and evaluate total fusion power from ITER plasma. This utilizes method of counting gamma radiation metal sample irradiated by flux at irradiation end located near Evaluation operational radioactivity sample, which has been induced during operation, necessary in order determine material, mass, appropriate time. Neutronic calculations are performed activity...
Since the decision to implement a tungsten (W) divertor in ITER, several tokamaks have introduced W their plasma facing components. For these devices, monitoring core has thus become an important topic of research as its high radiation capability can lead excessive radiative losses. We used our extreme UV (EUV) grazing incidence spectrometer (GIS) investigate 40–70 Å range where ions intermediate charge emit WEST tokamak discharges. The is mounted on mobile frame controlled with jack so that...
The ITER vacuum ultra-violet (VUV) core survey spectrometer has been designed as a 5-channel spectral system so that the high resolving power of 200-500 could be achieved in wavelength range 2.4-160 nm. To verify design VUV spectrometer, two-channel prototype was developed. As subsequent step test, operated at KSTAR since 2012 experimental campaign. From impurity injection experiments years 2015 and 2016, strong emission lines, such Kr xxv 15.8 nm, xxvi 17.9 Ne vii 46.5 vi 40.2 an array...
A compact advanced extreme-ultraviolet (EUV) spectrometer operating in the EUV wavelength range of a few nanometers to measure spatially resolved line emissions from tungsten (W) was developed for studying W transport fusion plasmas. This system consists two perpendicularly crossed slits—an entrance aperture and space-resolved slit—inside chamber as pinhole, which enables obtain spatial distribution emissions. Moreover, so-called v-shaped slit devised manage size measuring resolution caused...
The ITER tokamak requires diagnostics that on the one hand have a high sensitivity, spatial and temporal resolution dynamic range, while other are robust enough to survive in harsh environment.
Measurement of the time evolution particle number density was investigated in rf silane plasmas by using multipass laser extinction method. A He–Ne beam underwent multiple reflections on one horizontal plane plasma. The signal increased proportion to pass numbers. 1011cm−3 8nm radius particles measured at 10s a 32mTorr and 50W discharge nine passes. primary obtained comparing sizes with calculated from light signals Brownian free molecule coagulation model.
The design of an electron cyclotron emission imaging (ECEI) system for two-dimensional (2D) observation the magnetohydrodynamical modes in high temperature ITER (from ‘International Thermonuclear Experimental Reactor’) H-mode-like plasmas (5.3 T and 25 keV) based on fundamental ordinary mode (O1-mode) second-harmonic extraordinary (X2-mode) measurements is explored conceptually. For studying spatial resolution plasmas, relativistic broadening inward shift layer mid-plane are calculated....
Experimental and theoretical studies were conducted to simultaneously study the role of particle size gas pressure on nonlinear behavior dust oscillations in a plasma. Oscillation spectra experimentally obtained by using four different sized (1.5, 2, 3, 4 μm) particles at 250 mTorr, which is high compared previously reported works. The measured results good agreement with calculations based self-consistent collisional plasma model parametric oscillation model. In addition, dependence force...
One of the main purposes ITER2 neutron activation system (NAS) is to evaluate total production rate from all over plasma. The measurement accuracy depends on position and profile plasma material in front irradiation end. It required minimize amount its density variation across field view between Due radiation thermal environment ITER in-vessel, however, NAS cannot avoid strong influence in-vessel materials such as diagnostic first wall, blanket modules, divertor cassettes, those are located...