Vacuum commissioning and operation result after the KSTAR PFC upgrade

Kwangpyo Kim; Hyunmyung Lee; Hyung ho Lee; Koung Moon Kim; Hyunseok Kim; Jeongwon Lee; H. Schamis; E. P. Gilson; Jae in Song; Nam yong Joung; Soo hyeon Park

doi:10.1016/j.fusengdes.2025.115249

Vacuum commissioning and operation result after the KSTAR PFC upgrade

Kwangpyo Kim, Hyunmyung Lee, Hyung ho Lee, Koung Moon Kim, Hyunseok Kim, Jeongwon Lee, H. Schamis, E. P. Gilson, Jae in Song, Nam yong Joung, Soo hyeon Park

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The first vacuum commissioning after the installation of new tungsten mono-block cassette divertor has been successfully conducted in KSTAR. The tungsten divertor has been installed in the lower divertor region to handle the high divertor heat loads up to 10 MW/m². On the one hand, the plasma facing components except for the tungsten divertor in the KSTAR vacuum vessel still consists of graphite tiles. Thus, it was much more challenging to maintain high-quality vacuum condition mainly because of various possible impurity sources inside the vessel compared with previous experiment campaigns. In this paper, the detailed procedure for securing vacuum condition of the KSTAR tokamak after the installation of the new tungsten divertor is presented. The vacuum condition is also examined regarding the plasma start-up and the long-pulse high-performance quality.

Original language	English (US)
Article number	115249
Journal	Fusion Engineering and Design
Volume	219
DOIs	https://doi.org/10.1016/j.fusengdes.2025.115249
State	Published - Oct 2025

All Science Journal Classification (ASJC) codes

Civil and Structural Engineering
Nuclear Energy and Engineering
General Materials Science
Mechanical Engineering

Keywords

KSTAR
Plasma
Superconducting Tokamak
Vacuum
Wall conditioning

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10.1016/j.fusengdes.2025.115249

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@article{79e24dd183064fe582833ab905883c9a,

title = "Vacuum commissioning and operation result after the KSTAR PFC upgrade",

abstract = "The first vacuum commissioning after the installation of new tungsten mono-block cassette divertor has been successfully conducted in KSTAR. The tungsten divertor has been installed in the lower divertor region to handle the high divertor heat loads up to 10 MW/m2. On the one hand, the plasma facing components except for the tungsten divertor in the KSTAR vacuum vessel still consists of graphite tiles. Thus, it was much more challenging to maintain high-quality vacuum condition mainly because of various possible impurity sources inside the vessel compared with previous experiment campaigns. In this paper, the detailed procedure for securing vacuum condition of the KSTAR tokamak after the installation of the new tungsten divertor is presented. The vacuum condition is also examined regarding the plasma start-up and the long-pulse high-performance quality.",

keywords = "KSTAR, Plasma, Superconducting Tokamak, Vacuum, Wall conditioning",

author = "Kwangpyo Kim and Hyunmyung Lee and Lee, \{Hyung ho\} and Kim, \{Koung Moon\} and Hyunseok Kim and Jeongwon Lee and H. Schamis and Gilson, \{E. P.\} and Song, \{Jae in\} and Joung, \{Nam yong\} and Park, \{Soo hyeon\}",

note = "Publisher Copyright: {\textcopyright} 2025",

year = "2025",

month = oct,

doi = "10.1016/j.fusengdes.2025.115249",

language = "English (US)",

volume = "219",

journal = "Fusion Engineering and Design",

issn = "0920-3796",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Vacuum commissioning and operation result after the KSTAR PFC upgrade

AU - Kim, Kwangpyo

AU - Lee, Hyunmyung

AU - Lee, Hyung ho

AU - Kim, Koung Moon

AU - Kim, Hyunseok

AU - Lee, Jeongwon

AU - Schamis, H.

AU - Gilson, E. P.

AU - Song, Jae in

AU - Joung, Nam yong

AU - Park, Soo hyeon

PY - 2025/10

Y1 - 2025/10

N2 - The first vacuum commissioning after the installation of new tungsten mono-block cassette divertor has been successfully conducted in KSTAR. The tungsten divertor has been installed in the lower divertor region to handle the high divertor heat loads up to 10 MW/m2. On the one hand, the plasma facing components except for the tungsten divertor in the KSTAR vacuum vessel still consists of graphite tiles. Thus, it was much more challenging to maintain high-quality vacuum condition mainly because of various possible impurity sources inside the vessel compared with previous experiment campaigns. In this paper, the detailed procedure for securing vacuum condition of the KSTAR tokamak after the installation of the new tungsten divertor is presented. The vacuum condition is also examined regarding the plasma start-up and the long-pulse high-performance quality.

AB - The first vacuum commissioning after the installation of new tungsten mono-block cassette divertor has been successfully conducted in KSTAR. The tungsten divertor has been installed in the lower divertor region to handle the high divertor heat loads up to 10 MW/m2. On the one hand, the plasma facing components except for the tungsten divertor in the KSTAR vacuum vessel still consists of graphite tiles. Thus, it was much more challenging to maintain high-quality vacuum condition mainly because of various possible impurity sources inside the vessel compared with previous experiment campaigns. In this paper, the detailed procedure for securing vacuum condition of the KSTAR tokamak after the installation of the new tungsten divertor is presented. The vacuum condition is also examined regarding the plasma start-up and the long-pulse high-performance quality.

KW - KSTAR

KW - Plasma

KW - Superconducting Tokamak

KW - Vacuum

KW - Wall conditioning

UR - https://www.scopus.com/pages/publications/105007598056

UR - https://www.scopus.com/inward/citedby.url?scp=105007598056&partnerID=8YFLogxK

U2 - 10.1016/j.fusengdes.2025.115249

DO - 10.1016/j.fusengdes.2025.115249

M3 - Article

AN - SCOPUS:105007598056

SN - 0920-3796

VL - 219

JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

M1 - 115249

ER -

Vacuum commissioning and operation result after the KSTAR PFC upgrade

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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