A5051897375- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Scientific Measurement and Uncertainty Evaluation
- Laser-Plasma Interactions and Diagnostics
- Traffic Prediction and Management Techniques
- Educational Curriculum and Learning Methods
- Molecular Communication and Nanonetworks
- Bacteriophages and microbial interactions
- SARS-CoV-2 detection and testing
- Safety and Risk Management
- Nuclear Materials and Properties
- Ionosphere and magnetosphere dynamics
- Traffic and Road Safety
Kyushu University
2020-2024
Chang'an University
2021
Abstract Electron cyclotron wall conditioning with neon gas (Ne-ECWC) has been performed on the normal conducting spherial tokamak QUEST metal walls under a trapped particle configuration O-mode EC waves including X-mode polarization frequency of 8.2 GHz and an injection power 16 kW. The Ne-ECWC removes hydrogen from small retention. decreases recycling at following discharges, contributing to improvement plasma start-up: current increases start-up timing shifts forward. However, defects...
Abstract The electron temperature and density profiles in the midplane of a spherical tokamak plasma produced by cyclotron heating (ECH) Q-shu University experiment with steady-state (QUEST) are measured helium line intensity ratio method. compared those obtained Thomson scattering method, temperatures densities found to agree within factors ∼2 ∼6, respectively. Taken together previous results comparisons performed scrape-off layers several toroidal devices, same degree agreement between...
Fast Ejecting System of Targeted sAmple called FESTA has been developed to carry out the measurement dynamic hydrogen retention by a test sample. A sample can be exposed and extracted from targeted plasma at any time using FESTA, however, when exposing sample, chamber wall gets coated some as it is open QUEST vacuum vessel. We refer this plasma-induced background. To measure amount retained itself, contribution induced background must subtracted measurements. accurate plasma-exposed...
Abstract A power-supply system was developed for Ohmic heating (OH) to double × 10 18 the amount of change magnetic flux in primary central solenoid (CS) on QUEST spherical tokamak. Two power supplies are connected with stacks insulated-gate bipolar transistors, and sequentially operated generate positive negative CS currents. This is controlled via a field-programmable gate array, which guarantees safety entire operation. The new OH system, assisted by electron cyclotron heating, enables...
The Thomson scattering control system has been modified to measure the time evolution of electron density and temperature profiles during long duration discharges in QUEST spherical tokamak. consists a signal generator circuit. former accepts main trigger provides multiple triggers, each which starts short-term (e.g. 15 s) measurement. latter triggers synchronize oscilloscope laser oscillation was used 1000 s QUEST, temporal evolutions were obtained successfully. It found are stationary...
In order to analyze the significant differences in duration of expressway traffic accidents under different influencing factors, a method for analyzing influence factors incidents based on survival analysis is proposed. Based incident data Shaanxi expressway, Kaplan-Meier combined with Tarone-Ware was used test significance degree incidents, and strong correlation were extracted. Then Cox proportional hazards model (test level α = 0.1) study impact life cycle. The results show that time,...
National character is the most distinctive of Marxism. Marxist theory fundamental guiding ideology China’s construction and development. The development all aspects China embodies core essence A flourishing education prospers country, while good makes a country stronger. Higher an important symbol country’s level potential. Education depends on people, at same time, it for people. national higher mainly reflected in three aspects: fairness, people-oriented, serving At present, still facing...
ed by static and dynamic retention. In QUEST, Fast Ejecting System of Targeted sAmple named FESTA has been developed to measure the local retention exposing a specimen. Such is evaluated hydrogen gas pressure released from plasma-exposed specimen, so it necessary perform calibration data before analysis. On other hand, considering future work calculating fuel particles' reflection rate on measurement after exposure should also be carried out simultaneously. Therefore, we have drawn up...