Maintenance of the 1st NBI vacuum system for the KSTAR tokamak. Issue 1 (1st May 2022)

• Record Type: Journal Article
• Authors: Ju Lee, Young; Taek Park, Hyun; Su Kim, Jong; Gu Kwak, Jong
• Is Part Of: IOP conference series. Volume 1240:Issue 1(2022)
• Publication Date: 2022-05-01
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/1240/1/012099
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: First neutral beam injection system for the KSTAR tokamak has been operated after the installation and commissioning on 2010. To provide 120 keV and more than 6 MW deuterium neutral beam, it requires large vacuum pumping system with the pumping speeds 1.0E6 l/s range. For this purpose, R&D works with a prototype cryosorption panel had performed from Korea Atomic Energy Research Institute (KAERI) and GM cooler based 2 stage cryosorption pump was accepted for the 1st NBI system. During 10 years of annual operation, the pumping speeds decreased continuously due to the damage in cryopanels and all of the cryopanels were repaired for the 2021 KSTAR campaign. Details of the 1st KSTAR NBI vacuum pumping system will be introduced and long operation results including the behavior after the repair, will be reported in this paper.