A5036169035- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Ionosphere and magnetosphere dynamics
- Diamond and Carbon-based Materials Research
- Particle accelerators and beam dynamics
Seoul National University
2021-2022
Abstract We have developed TorbeamNN: a machine learning surrogate model for the TORBEAM ray tracing code to predict electron cyclotron heating and current drive locations in tokamak plasmas. TorbeamNN provides more than 100 times speed-up compared highly optimized simplified real-time implementation of without any reduction accuracy offline, full fidelity code. The was trained using KSTAR (ECH) mirror geometries works both O-mode X-mode absorption. predictions been validated offline...
Abstract A tokamak, a torus-shaped nuclear fusion device, needs an electric current in the plasma to produce magnetic field poloidal direction for confining plasmas. Plasma is conventionally generated by electromagnetic induction. However, steady-state reactor, minimizing inductive essential extend tokamak operating duration. Several non-inductive drive schemes have been developed operations such as radio-frequency waves and neutral beams. commercial reactors require minimal use of these...
We report the neoclassical tearing mode (NTM) stabilization experimental results by injection of electron cyclotron (EC) beam in KSTAR, and its analysis with integrated modelling. In KSTAR experiment, NTM was intentionally induced EC injected plasma control system (PCS) to stabilize it. Here, angle controlled based on minimum seeking algorithm for island growth rate. Although not changed significantly, width significantly decreased towards end experiment followed recovery performance. To...
Abstract We report a discovery of fusion plasma regime suitable for commercial reactor where the ion temperature was sustained above 100 million degree about 20 s first time. Nuclear as promising technology replacing carbon-dependent energy sources has currently many issues to be resolved enable its large-scale use sustainable source. State-of-the-art reactors cannot yet achieve high levels performance, temperature, and absence instabilities required steady-state operation long period time...