The KSTAR (Korean Superconducting Tokamak Advanced Research) project makes intensive use of superconducting (SC) magnets operated at 4,4 K The cold components of KSTAR require a forced flow of supercritical helium for magnets and structure, boiling liquid helium for current leads, and gaseous helium for thermal shields A helium refrigeration system has been custom-designed for this project The purpose of this paper is to give a brief overview of the proposed cryogenic system,. The specified thermal loads for the different operating modes are presented This specification results in the definition of a design mode for the refrigerator The design and construction of the resulting 9 kW at 4.5-K Helium Refrigeration System (HSR) are presented.
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