Effect of Incorporating Cooling Channels into the Coil Support Structure of the TPX Toroidal Field Magnet
Toroidal field (TF) magnets for the Tokamak Physics experiment (TPX) include superconducting cable-in conduit conductor (CICC) coils encased in a stainless steel support structure, which receives most of the heat generated in the magnet during operation. An efficient cooling of the structure is necessary to intercept the heat which otherwise would reach the winding pack and reduce temperature margin of the superconductor. Optimal cooling arrangement requires joint (coil+structure) analysis which considers thermal coupling between the winding pack and the structure.
A joint steady-state 3-D thermal-hydraulic model for toroidal field magnets is presented. It consists of the two submodels, coupled through iterative runs. First submodel analyzes one-dimensional helium flow in CICC double pancake accounting for thermal coupling netween turns. Second is a finite element model for the support structure, represented by 12 sections along the circumference of the coil. Model has demonstrated fast convergence and capabilities to analyze heat flux distribution in the winding pack and structure. Temperature profile in CICC and heat absorbed by case cooling channels are presented.
KeywordsTotal Heat Helium Epoxy Compressibility Polyimide
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