W. C. Kim

Overview of the KSTAR experiments toward fusion reactor

W.H. Ko, S. W. Yoon, W. C. Kim, J.G. Kwak et autres

Abstract The Korean Superconducting Tokamak Advanced Research has been focused on exploring the key physics and engineering issues for future fusion reactors by demonstrating the long pulse operation of high beta steady-state discharge. Advanced scenarios are being developed with the goal for …

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Criterion for long sustained highly peaked ion temperature in diverted configuration of KSTAR tokamak

Hyunsun Han, June-Key Chung, Y.M. Jeon, Jisung Kang et autres

In the context of KSTAR plasma research, the discovery of the fast ion regulated enhanced mode is noteworthy due to its remarkable ability to maintain ion temperatures exceeding up to 10 keV for a few tens of seconds, avoid impurity accumulation, and …

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A sustained high-temperature fusion plasma regime facilitated by fast ions

Hyunsun Han, Sangjin Park, C. Sung, Jisung Kang et autres

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KSTAR Status and Upgrade Plan Toward Fusion Reactor

J.G. Kwak, Tongnyeol Rhee, Hyunsun Han, Jisung Kang et autres

Korea Superconducting Tokamak Advanced Research (KSTAR) program has made significant advances in the development of long pulse and high-performance plasma scenarios, utilizing the advantages of the fully superconducting tokamak. Ten years of KSTAR operation have produced outstanding progress in plasma control, extending …

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PLC- and PC-based Local Control System for the HWR#2 Cryomodule of the Heavy Ion Accelerator RAON

Suk Jin Choi, Heetae Kim, W. C. Kim

Rotational Resonance of Nonaxisymmetric Magnetic Braking in the KSTAR Tokamak

Jong-Kyu Park, Y.M. Jeon, J. Ménard, W.H. Ko et autres

One of the important rotational resonances in nonaxisymmetric neoclassical transport has been experimentally validated in the KSTAR tokamak by applying highly nonresonant n=1 magnetic perturbations to rapidly rotating plasmas. These so-called bounce-harmonic resonances are expected to occur in the presence of magnetic …

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Plasma-Surface Interaction Activities in KSTAR

Suk‐Ho Hong, Yaowei Yu, K. P. Kim, J.G. Bak et autres

Selected topics of Plasma-Surface Interaction (PSI) activities in KSTAR are briefly introduced. SOL parameter measurements, particle balance and fuel retention, in-vessel dust research, and finally tungsten R & D are discussed. Some quantitative numbers from the initial phase of the operation are …

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Confinement and ELM characteristics of H-mode plasmas in KSTAR

J.-W. Ahn, H. S. Kim, Y.S. Park, L. Terzolo et autres

Abstract The latest results of confinement and edge-localized mode (ELM) characteristics of Korea Superconducting Tokamak Advanced Research (KSTAR) H-mode plasmas are reported. The estimation of fast ion contribution to the total stored energy, calculated by both the NUBEAM and ASTRA simulations, and …

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Suppression of Edge Localized Modes in High-Confinement KSTAR Plasmas by Nonaxisymmetric Magnetic Perturbations

Y.M. Jeon, J.-K. Park, S.W. Yoon, W.H. Ko et autres

Edge localized modes (ELMs) in high-confinement mode plasmas were completely suppressed in KSTAR by applying n=1 nonaxisymmetric magnetic perturbations. Initially, the ELMs were intensified with a reduction of frequency, but completely suppressed later. The electron density had an initial 10% decrease followed …

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Initial measurements of fast ion loss in KSTAR

Junghee Kim, Jun Young Kim, S.W. Yoon, M. García-Muñoz et autres

A fast ion loss detector (FILD) has been installed and tested in Korea Superconducting Tokamak Advanced Research (KSTAR). KSTAR FILD measures the energy and the pitch-angle of the escaping ions with the striking positions on the scintillator plane. Measurements of the fast …

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Key Features in the Operation of KSTAR

J.G. Kwak, Y.K. Oh, K. P. Kim, S. W. Kim et autres

The Korea Superconducting Tokamak Advanced Research (KSTAR) device is aimed at advanced tokamak (AT) research. Three years have passed since it achieved its first plasma in 2008. Because it is a superconducting machine and is working toward AT research, it has unique …

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Investigation of the radioactivity inside the KSTAR vacuum vessel after shutdown by using gamma-ray spectrometry

Y. S. Lee, A.C. England, MunSeong Cheon, Hyun-Seok Kim et autres

Activation products from structural materials inside the Korea Superconducting Tokamak Advanced Research (KSTAR) vacuum vessel at 1 month after shutdown were investigated via gamma-ray spectroscopy using a high-purity germanium (HPGe) detector. To carry out this work, the HPGe detector system was placed …

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