Predictive modeling of KSTAR operation scenarios are performed with the aim of developing high performance steady state operation scenarios. Various transport codes are employed for this study. Firstly, steady state operation capabilities are investigated with time dependent simulations using a free-boundary transport code. Secondly, reproducibility of high performance steady state operation sc...

The potential formation of multi-mega-ampere beams relativistic "runaway" electrons (REs) during sudden terminations tokamak plasmas poses a significant challenge to the tokamak's development as fusion energy source. Here, we use state-of-the-art modeling disruption magnetohydrodynamics coupled with self-consistent evolution RE generation and transport show that non-axisymmetric in-vessel coil ...

Abstract Fusion power plant designs based on magnetic confinement, such as the tokamak design, offer a promising route to sustainable fusion but require robust exhaust solutions capable of tolerating intense heat and particle fluxes from plasma at core device. Turbulent transport in region where interface between materials device is handled - called divertor volume poorly understood, yet impact...

This paper presents results from the first use of neural networks for the real-time feedback control of high temperature plasmas in a tokamak fusion experiment. The tokamak is currently the principal experimental device for research into the magnetic confinement approach to controlled fusion. In the tokamak, hydrogen plasmas, at temperatures of up to 100 Million K, are confined by strong magnet...

The issue of first wall and divertor target lifetime represents one of the greatest challenges facing the successful demonstration of integrated tokamak burning plasma operation, even in the case of the planned next step device, ITER, which will run at a relatively low duty cycle in comparison to future fusion power plants. Material erosion by continuous or transient plasma ion and neutral impa...

Dynamics of ion internal transport barrier (ITB) formation and impurity transport both in the Large Helical Device (LHD) heliotron and JT-60U tokamak are described. Significant differences between heliotron and tokamak plasmas are observed. The location of the ITB moves outward during the ITB formation regardless of the sign of magnetic shear in JT-60U and the ITB becomes more localized in the ...

Introduction Filaments, or blobs, are field aligned plasma structures which have been observed in the scrape of layer of magnetically confined plasmas. These filaments carry particles into the SOL and therefore play a role in determining the profiles during L-mode and inter-ELM H-mode scenarios. While there have been many investigations into the dynamics of such filaments [1, 2], few have conce...

In a small tokamak, the visible light emission is observed and used to investigate plasmas' behavior with fast camera. However, reflected causes systemic error in measuring emitted from plasma. this paper, we managed overcome reflection effect ray-tracing technique which utilized synthetic diagnostic platform of tokamak device PHiX at Tokyo Institute Technology using Raysect CHERAB python libra...