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Gourd-shape high temperature superconducting (HTS) magnet is stacked by gourd-shape HTS plates and excited by field cooling method. It can operate in persistent current mode (PCM), and has the functions of magnetic flux density amplification and magnetic flux accumulation. In this paper, the cooling structure and cryo-stability of the gourd-shape HTS magnet under gas cooling are numerically analyzed. Two types of gas-cooling structure with copper plates, alternating stack and back-to-back, are proposed. Cooling holes are cut on the copper plates to improve the cooling efficiency. Thermal models of two cooling structures and simple stacked structure are established, and cryo-stability is analyzed by the finite element method. The influence of the outer edge extension length and thickness of copper plates, the number, arrangement and radii of cooling holes on the cryo-stability of the two cooling structures is studied. Results show that the two cooling structures have better thermal stability than the simple stacked structures under gas-helium cooling, and the heat transferring efficiency can be improved by changing copper plates and cooling holes. The research results provide a new perspective to the operation of HTS stacked magnets under gas cooling.
