Jae-Min Kwon

Linear stability analysis of non-resonant kinetic ballooning mode in comparison with the ion temperature gradient/trapped electron mode case

J. Y. Kim, Janghoon Seo, Jae-Min Kwon, Yasuaki Kishimoto et autres

Abstract Unlike in the finite magnetic shear region where turbulent transport is typically dominated by the electrostatic ion temperature gradient and/or trapped electron mode (ITG/TEM), in the weak shear region it is possible for the electromagnetic non-resonant kinetic ballooning mode (KBM), also …

kr, jp (code pays fourni par la source)

An Interactive Three-Dimensional Volume Visualization Pipeline for Fusion Simulation Data in Unreal Engine and Omniverse

Darian Figuera-Michal, Eui-Hyun Jung, Mintae Na, Sun-Jeong Kim et autres

We present an end-to-end pipeline that delivers gyrokinetic scalar fields into Unreal Engine and NVIDIA Omniverse, with three key advances. The first is the render time, native coordinate sampling of curvilinear structured grid fields, as exemplified by gKPSP on (r,θ,φ), in both …

kr (code pays fourni par la source)

Impurity modelling and transport coefficient reconstruction in tokamak core plasmas

Yoon Seong Han, Junhyeok Yoon, In Seok Song, J.H. Hwang et autres

Abstract The developed KAIST impurity modelling (KIM) code analyses impurity transport in the poloidal cross-section of tokamak plasma in both prediction and reconstruction modes. The prediction mode utilizes a numerical solution of the one-dimensional radial continuity equation to simulate impurity transport based …

kr (code pays fourni par la source)

Limit-cycle oscillations in turbulence–zonal flow dynamics: Observations in toroidal gyrokinetic simulations and sparse regression modeling

Jung-Min Suh, Sumin Yi, Jae-Min Kwon, Gahyung Jo et autres

We investigate the dynamics of turbulence–zonal-flow interaction in toroidal ion-temperature-gradient (ITG) turbulence using global particle-in-cell gyrokinetic (GK) simulations. Under the conditions considered, we observe long-lasting, regular limit-cycle oscillations (LCOs) for different temperature gradients. Two factors are crucial for obtaining long-lasting and apparent …

kr (code pays fourni par la source)

Bayesian optimization for design space exploration of tokamak fusion reactors

Boseong ­Kim, Jae-Min Kwon, Gahyung Jo, Bong Guen Hong et autres

kr (code pays fourni par la source)

Multi-species Rosenbluth Fokker-Planck collision operator for discontinuous Galerkin method

Janghoon Seo, Gahyung Jo, Jae-Min Kwon, Eisung Yoon

kr (code pays fourni par la source)

Data-Driven Reduced-Order Modeling of Phase Mixing Dynamics from Particle Kinetic Simulation

Darian Figuera-Michal, S. I. Yum, Jae-Min Kwon, Eisung Yoon

Phase mixing is a fundamental kinetic process that governs dissipation and stability in collisionless plasmas, but its inherent filamentation in velocity space creates major challenges for both high-fidelity simulations and reduced-order modeling. This work presents the first exploratory evaluation of a joint …

Scalable modeling of 3D eddy current problem for magnetic fusion devices

Chanyoung Lee, Juhyung Kim, Gahyung Jo, Jae-Min Kwon et autres

kr (code pays fourni par la source)

Reversal of the isotopic dependence of energy confinement in system size scans

Lei Qi, T. S. Hahm, Jae-Min Kwon, M. Leconte

Abstract We report a reversal in the isotopic dependence of energy confinement with increasing system size ρ ∗ − 1 from electrostatic global δf gyrokinetic simulations. The favorable isotope effects on the energy confinement observed in past and present-day tokamaks may diminish …

kr (code pays fourni par la source)

A field-aligned gyrokinetic solver based on discontinuous Galerkin in tokamak geometry

Gahyung Jo, Janghoon Seo, Jae-Min Kwon, Eisung Yoon

This paper presents the development of a hyperbolic solver for the gyrokinetic equation in tokamak geometry. The discontinuous Galerkin method discretizes the gyrokinetic equation on the field-aligned mesh composed of twisted prism-shaped elements in the tokamak domain. The elements are generated by …

kr (code pays fourni par la source)

Verification of fast ion and rotation effects on turbulence through comparison of GENE and CGYRO with L-mode plasmas in KSTAR

Donguk Kim, T. J. Moon, C. Sung, Eisung Yoon et autres

Abstract This study presents a cross-verification of fast ion effects on turbulence through a systematic comparison of two leading gyrokinetic codes, GENE Jenko et al (2000 Phys. Plasmas 7 1904–10) and CGYRO Candy et al (2016 J. Comput. Phys. 324 73–93), using …

kr, de, us (code pays fourni par la source)

Predictive study of non-axisymmetric neutral beam ion loss on the upgraded KSTAR plasma-facing components

Taeuk Moon, Tongnyeol Rhee, Jae-Min Kwon, Y.M. Jeon et autres

We simulate ion loss induced by neutral beam injection (NBI) in three-dimensional (3D) space with high fidelity on the plasma-facing components (PFCs) of the Korea Superconducting Tokamak Advanced Research (KSTAR) device. Utilizing a 3D collision detection routine added to the NuBDeC code …