Abstract
A conduction-cooled warm bore high-temperature superconducting magnet has been designed, built and tested to serve high rigidity beam steering from K500 cyclotron at the Variable Energy Cyclotron center. The objective of the program is the design and fabrication of HTS magnet system for future accelerator magnet. The magnet is specified for beam steering of ± 3° in horizontal plane and ± 1.5° in vertical plane for maximum beam rigidity of 3.3 T-m. An optimized design has been carried out to achieve the specified field quality by suitably positioning the racetrack coils while satisfying several other design constraints. The window-type magnet is composed of double pancake coils wound with high-temperature superconducting tape mounted inside iron yoke and integrated with two-stage cryocoolers. The magnet was cooled down to operating temperature of approximately 20 K with cryocoolers and reached the designed field of 0.70 T (By-direction) and 0.35 T (Bx-direction). Test results demonstrate the technology feasibility of developing cryogen-free warm bore superconducting magnet for accelerator use. This paper describes the design, manufacture and test results of the HTS magnet.
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