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Description
This paper introduces the design and experimental demonstration of a novel insulated two-in-hand REBCO magnet for high-field applications. The inclusion of insulation ensures that the current follows the designed path, resulting in improved predictability and operational stability. Insulated magnets are particularly advantageous for applications requiring integrated quench detection and protection systems, making them ideal candidates for magnet matrix configurations. Conventional insulated magnets typically use Kapton tapes between turns or wrapped around the conductor, which is functional but limited by its thickness, softness, and lack of mechanical robustness. Our magnet design incorporates key innovations: the application of novel Pyralux® insulation—a very thin Kapton layer laminated between two outer copper sheets without adhesive bonding between conductor turns—to improved mechanical properties and compactness, a four-tapes co-winding technique, which includes two REBCO tapes in parallel to enhance defect tolerance, a copper tape for protection and a Pyralux insulation tape, and the integration of intermediate rings within each single pancake coil to effectively manage mechanical stresses in large-diameter pancakes. The copper laminates in Pyralux provides a robust way to introduce a much thinner Kapton layer between conductor turns than would otherwise be possible. Screening current effects in the REBCO coils were analyzed using a 3D T-A formulation, and the mechanical stresses were calculated to ensure reliable performance under high-field conditions. The design includes an integrated quench detection circuit for enhanced safety and performance monitoring. The magnet is designed to operate at around 10 K and will be cooled by conduction through highly-thermal-conducting spacers installed between the pancake coils. These innovations collectively demonstrate significant advancements in insulated magnet technology for high-field applications.
