The operation mode of the KSTAR (Korea Advanced Superconducting Tokamak Research) helium refrigerator is based on the day average thermal load of the KSTAR cold components. However, since the thermal load on the magnets and current-feeding devices of KSTAR are strongly time-dependent, a system which smoothens the heat load peaks and distributes the cryogenic helium at the proper instant is required. In this proceeding, we report the design issues of such a system, the distribution valve box of the KSTAR helium refrigerator, which are essential to cope with various operation modes and probable abnormal events of the KSTAR device.
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