Abstract
To study the dynamic characteristics of filamentary structure during the edge-localized mode (ELM) burst on the experimental advanced superconducting tokamak, the BOUT++ six-field two-fluid model is used to simulate the temporal and spatial evolutions of the ELM filaments. In the peak gradient region at the outer mid-plane, the radial speed of filaments is changed frequently and varied from 0.11 km/s to 0.79 km/s, and the poloidal speed oscillates in the range of 0.61–0.85 km/s. The width of the ELM filaments is increased from 7.76 mm to 26.7 mm and grows rapidly to 41.99 mm from t = 0.2717 ms to 0.2831 ms after the start of the burst. After that, the width decreases gradually and stabilizes at 25–30 mm when it comes to the saturation phase. Further research indicates that the filament propagation speed is increased during their outward movement. The width gradually decreases when the filaments move outward, and it is proportional to electron temperature (Te) perturbation. All the results are consistent with the experimental data presented by Chen et al., IEEE Trans. Plasma Sci. 47, 799 (2019).
Highlights
The H-mode regime is currently considered to be one of the most promising candidates to achieve ignition in a magnetic confinement fusion facility such as tokamak
The edgelocalized mode (ELM) filaments on the experimental advanced superconducting tokamak (EAST) can be reproduced by BOUT++ simulations
The area of the black rectangle is chosen to analyze the filaments near the divertor (1.7 m ≤ R ≤ 1.8 m and 0.6 m ≤ Z ≤ 0.9 m), and the blue rectangles are those in the outer mid-plane (OMP) (2.27 m ≤ R ≤ 2.34 m and −0.2 m ≤ Z ≤ 0.2 m)
Summary
The H-mode regime is currently considered to be one of the most promising candidates to achieve ignition in a magnetic confinement fusion facility such as tokamak. The experimental advanced superconducting tokamak (EAST) has achieved a wide variety of H-mode operational regimes with diverse ELMs. A tangential fast charge-coupled device (CCD) camera diagnostic system has been set up in the EAST to measure ELM filaments in the scrape-off layer (SOL).. The experiment reveals that the radial propagation speed for the EAST ELM filaments varies in the range 0.5–3.5 km/s, and the width of the filaments varies from 10 mm to 35 mm.. BOUT++ is a new and highly adaptable object-oriented C++ framework to perform 2-fluid tokamak edge simulations It is used in solving an arbitrary number of equations in 3D curvilinear coordinates using finite-difference methods.. The simulation results for the dynamic characteristics of ELM filaments are presented in Sec. III, including the temporal and spatial evolutions of the speed and width.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
