Analysis of the Thermal Loads on the KSTAR Cryogenic System

A large-scale helium refrigeration system is one of the key components for the KSTAR (Korea Superconducting Tokamak Advanced Research) device. In the design of the refrigeration system, an estimation of the thermal loads on the cold mass is an important issue according to the operation scenario. The...

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Bibliographic Details
Main Authors: Kim, Y S, Oh, Y K, Kim, W C, Park, Y M, Lee, Y J, Jin, S B, Sa, J W, Choi, C H, Cho, K W, Bak, J S, Lee, G S
Format: Conference Proceeding
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AC LOSSES
CRYOGENICS
CRYOSTATS
DESIGN
EDDY CURRENTS
HELIUM
MAGNETIC FIELDS
OPERATION
PLASMA
REFRIGERATION
REPUBLIC OF KOREA
SUPERCONDUCTING MAGNETS
SYSTEMS ANALYSIS
TEMPERATURE RANGE 0000-0013 K
THERMODYNAMIC PROPERTIES
TOKAMAK DEVICES
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Summary:A large-scale helium refrigeration system is one of the key components for the KSTAR (Korea Superconducting Tokamak Advanced Research) device. In the design of the refrigeration system, an estimation of the thermal loads on the cold mass is an important issue according to the operation scenario. The cold mass of the KSTAR device is about 250 tons including 30 superconducting (SC) coils and the magnet structure. In addition to the static thermal loads, pulsed thermal loads to the refrigeration system have been considered in the operation stage. The main pulsed thermal loads on magnet system are AC losses in the SC coils and eddy current losses in the magnet structure that depend on the magnetic field variation rate. The nuclear radiation loss due to plasma pulse operation is also considered. The designed cooling capacity of the refrigeration system is estimated to be about 9 kW at 4.5 K isothermal. In this paper, calculation of the various kinds of thermal loads on KSTAR cryogenic system and design of the large-scale helium refrigeration system are presented.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.1774701