Abstract
Korea Superconducting Tokamak Advanced Research (KSTAR) is upgraded for its KSTAR 3rd campaign for new target mission to produce the D-shaped plasma with a target plasma current of 500 kA and/or pulse length of 5 s. New Plasma Facing Components (PFCs) are installed which leads to the increase of the surface area of the vessel by a factor of about 5. The vacuum conditioning such as the vessel baking has been performed in order to remove various kinds of impurities including H 2O, carbon and oxygen for the plasma. The total outgassing rate in the KSTAR 1st campaign was measured as 1.5 × 10 −4 mbar ℓ s −1 which is increased by a factor of 3 (6.49 × 10 −4 mbar ℓ s −1) in the KSTAR 3rd campaign. Nevertheless, the outgassing rates per unit area have been decreased from 9.31 × 10 −5 mbar ℓ m −2 s −1 to 1.22 × 10 −5 mbar ℓ m −2 s −1 due to the upgrade of baking system and series of baking operation.
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