Zobrazeno 1 - 10
of 158
pro vyhledávání: '"Yong-su Na"'
Autor:
SeongMoo Yang, Jong-Kyu Park, YoungMu Jeon, Nikolas C. Logan, Jaehyun Lee, Qiming Hu, JongHa Lee, SangKyeun Kim, Jaewook Kim, Hyungho Lee, Yong-Su Na, Taik Soo Hahm, Gyungjin Choi, Joseph A. Snipes, Gunyoung Park, Won-Ha Ko
Publikováno v:
Nature Communications, Vol 15, Iss 1, Pp 1-9 (2024)
Abstract A tokamak relies on the axisymmetric magnetic fields to confine fusion plasmas and aims to deliver sustainable and clean energy. However, misalignments arise inevitably in the tokamak construction, leading to small asymmetries in the magneti
Externí odkaz:
https://doaj.org/article/9cd65e4052484aca88152ee690293f5f
Autor:
Yong-Su Na
Publikováno v:
AAPPS Bulletin, Vol 33, Iss 1, Pp 1-13 (2023)
Abstract Recent progress of advanced operation modes in tokamaks is addressed focusing upon internal transport barrier (ITB) discharges. These ITB discharges are being considered as one of candidate operation modes in fusion reactors. Here, “intern
Externí odkaz:
https://doaj.org/article/1254db628bf24226bef3b7d7c27435c2
Autor:
Yong-Su Na, Jaemin Seo, Yoonji Lee, Gyungjin Choi, Minseo Park, Sangjin Park, Sumin Yi, Weixing Wang, Min-Gu Yoo, Minsoo Cha, Beomsu Kim, Young-Ho Lee, Hyunsun Han, Boseong Kim, Chanyoung Lee, SangKyeun Kim, SeongMoo Yang, Cheol-Sik Byun, Hyun-Seok Kim, Jinseok Ko, Woochang Lee, Taik Soo Hahm
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-7 (2022)
Fusion devices like tokamaks require plasma current to generate magnetic field for plasma confinement. Here the authors report an observation of a self-generated anomalous current that contributes up to 30% of the total current in the fusion plasma a
Externí odkaz:
https://doaj.org/article/a295f8f03cc14f73af87c607a0c417ee
Autor:
S.-J. Lee, D. Hu, M. Lehnen, E. Nardon, Jayhyun Kim, D. Bonfiglio, F.J. Artola, M. Hoelzl, Yong-Su Na, JOREK team
Publikováno v:
Nuclear Fusion, Vol 64, Iss 12, p 129601 (2024)
Externí odkaz:
https://doaj.org/article/13ea81cdd04b41b49f8e8b482df5d3bf
Publikováno v:
Nuclear Fusion, Vol 64, Iss 10, p 106058 (2024)
Resonant layers in a tokamak respond to non-axisymmetric magnetic perturbations by amplifying the mode amplitude and balancing the plasma rotation through magnetic reconnection and force balance, respectively. This resonant response can be characteri
Externí odkaz:
https://doaj.org/article/735baf973bb84311abdeef8bc0517ddc
Autor:
S.-J. Lee, E. Madenci, Yong-Su Na, P. de Marné, M. Dibon, P. Heinrich, S. Jachmich, G. Papp, T. Peherstorfer, the ASDEX Upgrade Team
Publikováno v:
Nuclear Fusion, Vol 64, Iss 10, p 106023 (2024)
Shattered pellet injection (SPI) is a promising method for controlling plasma disruptions in tokamaks. In this study, we present numerical modelling of the fragmentation of cryogenic deuterium pellets within the context of SPI, using the peridynamic
Externí odkaz:
https://doaj.org/article/21c0fcd783064095b76134bcaf4b6ea4
Autor:
S.-J. Lee, D. Hu, M. Lehnen, E. Nardon, Jayhyun Kim, D. Bonfiglio, F.J. Artola, M. Hoelzl, Yong-Su Na, JOREK team
Publikováno v:
Nuclear Fusion, Vol 64, Iss 10, p 106042 (2024)
3D nonlinear MHD simulations of neon-doped single shattered pellet injection (SPI) conducted with the JOREK code reveal rich physics during SPI-induced disruptions in KSTAR. In the early phase, pressure-driven modes dominate, and the perturbation of
Externí odkaz:
https://doaj.org/article/50bdade78b50475381bb6d488f47e1e8
Autor:
Minseok Kim, W.H. Ko, Sehyun Kwak, Semin Joung, Wonjun Lee, B. Kim, D. Kim, J.H. Lee, Choongki Sung, Yong-Su Na, Y.-C. Ghim
Publikováno v:
Nuclear Fusion, Vol 64, Iss 10, p 106052 (2024)
We propose an outlier-resilient Gaussian process regression (GPR) model supported by support vector machine regression (SVMR) for kinetic profile inference. GPR, being a non-parametric regression using Bayesian statistics, has advantages in that it i
Externí odkaz:
https://doaj.org/article/a216d94e088f488eb58418ab936b8e19
Autor:
Boseong Kim, M.S. Park, Y.H. Lee, S.K. Kim, C.Y. Lee, S.C. Hong, J. Seo, J.G. Lee, S.J. Park, H.-S. Kim, Yong-Su Na
Publikováno v:
Nuclear Fusion, Vol 63, Iss 12, p 126013 (2023)
We report experimental observations on the effect of plasma boundary shaping towards balanced double-null (DN) configuration on the plasma performance in KSTAR. The transition from a single-null to a DN configuration resulted in improved plasma perfo
Externí odkaz:
https://doaj.org/article/a4d8aa6f0041490da5767511cf924615
Autor:
Youngho Lee, S.K. Kim, J.W. Kim, B. Kim, M.S. Park, J.M. Kwon, M.J. Choi, S.H. Hahn, M.W. Lee, S.M. Yang, S.C. Hong, C.Y. Lee, S.J. Park, C.S. Byun, H.-S. Kim, J. Chung, Yong-Su Na
Publikováno v:
Nuclear Fusion, Vol 63, Iss 12, p 126032 (2023)
This paper deals with one of the origins and trigger mechanisms responsible for the observed performance enhancements in the hybrid scenario experiments conducted in Korea Superconducting Tokamak Advanced Research (KSTAR). The major contribution to t
Externí odkaz:
https://doaj.org/article/a8a23b0368794d17b4676c8f9cd7c037