Plasma-Surface Interaction Activities in KSTAR

Hong, Suk–Ho; Yu, Yaowei; Kim, K. P.; Bak, J. G.; Park, H. J.; Oh, Youngsuk; Chung, Jae-Hoon; Nam, Y. U.; Bang, Eunnam; Kim, K. R.; Litnovsky, A.; Hellwig, Malte; Matveev, D.; Komm, M.; Berg, M.A. van den; Kim, W. C.; Kim, H. K.; Rho, T. H.; Chu, Yong; Oh, Y.K.; Yang, H.L.; Park, K. R.; Chung, Kyu‐Sun; Team, Kstar

doi:10.13182/fst13-a16879

Cited by 3 publications

(1 citation statement)

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“…Initial design limits of PFCs in Korea superconducting tokamak advanced research (KSTAR) were 20 s of operation time with a 16 MW input power (KBSI internal report: KSTAR physics validation review documents, 1997). Since carbon-based graphite tiles cannot tolerate heat flux more than 3.5 MW·m −2 in such a condition, KSTAR has a PFC upgrade plan to employ the tungsten divertor, and thus, National Fusion Research Institute started the development activities of tungsten first wall components [6,7]. For longterm technology development, the pre-conceptual study of the Korean demonstration reactor (K-DEMO) divertor was also performed [8].…”

Section: Introductionmentioning

confidence: 99%

A brief summary of tungsten technology development in Korea

Hong

2020

Tungsten

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A review of tungsten technology development in Korea is briefly given. According to the upgrade plan of Korea superconducting tokamak advanced research (KSTAR) tokamak associated with Korean fusion energy R&D program, graphite plasma-facing components will be replaced with tungsten-based ones to handle the high-peak heat load caused by an increase of heating power up to 26 MW. Brazing technique to bond tungsten was developed and tungsten blocks were manufactured. Blocks were installed at the central divertor in KSTAR and exposed to high heat flux. Under high heat flux and long-pulse discharge, tungsten blocks were severely damaged. Molten tungsten materials show movements towards the high field side, which is j×B direction. The COMSOL ® modeling described the melting event quantitatively well. The failure of a water cooling system with a metal wall environment during a long-pulse plasma operation is very critical.

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Section: Introductionmentioning

confidence: 99%