Speakers
Description
REBCO coated conductors are regarded as an enabling material for next-generation high-field magnets due to their high current-carrying capacity at elevated fields and temperatures. The development of compact high-field HTS magnets has become increasingly important across a variety of scientific and technological applications. Among different coil configurations, the racetrack geometry is particularly advantageous for generating a long and straight uniform field region, making it a natural fit for accelerator facilities, particularly superconducting dipoles (bending magnets) and insertion devices such as wigglers and undulators.
This paper presents a comprehensive design of a 15 T REBCO racetrack magnet. The magnet is designed to operate at 10 K, with a bending radius of 6 mm and a straight-section length of 50 mm, wound using 4-mm-wide REBCO tapes from Shanghai Superconductor Technology Co. A genetic algorithm (GA) is adopted for electromagnetic optimization to minimize tape consumption, with the number of double pancakes, turns per double pancake, and operating current as optimization variables. The target central field is 15 T. The optimized design consists of ten double pancakes with 400 turns each and operates at 200 A.
A systematic stress analysis is also performed, accounting for winding tension, thermal stress during cooldown, and Lorentz forces during energization. The results show that the maximum hoop stress reaches 430 MPa and is concentrated in the curved end regions, which remains below the 600 MPa tensile limit of the REBCO tape.
Based on the validated electromagnetic and mechanical designs, a prototype model coil is currently under fabrication. The winding is impregnated with solder via vacuum pressure impregnation (VPI) to ensure good inter-turn thermal and electrical conductivity while improving the overall mechanical rigidity. The magnet is conduction-cooled by a cryocooler, eliminating the need for liquid helium and simplifying the cryogenic system. Subsequent testing of the model coil will be carried out to verify the design methodology and validate the stress analysis, providing a technical reference for future high-field HTS magnet development.
| Submitters Country | china |
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| Are you a student? | No |
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