A New Concept of a Hybrid Trapped Field Magnet

This paper presents a new concept for a hybrid trapped field magnet made of second generation high-temperature super-conducting ring-shape magnet and HTS stack tapes. This hybrid trapped field magnet has the potential to provide a better magnetic field. This paper focuses on the magnetization properties of this new magnet. First, ultraviolet laser cutting technology was used to prepare the striated HTS tapes. Then both tradition method and “wind-and-flip” method were used to fabricate the ring-shape magnet. After that, basic features of the hybrid trapped field magnet, such as the maximum trapped field and decay rate were quantified by pulsed field magnetization (PFM) experiments. Due to the limitation of PFM method, a more cost-effective magnetization method based on thermal controlled persistent current switch (PCS) was investigated to achieve a higher trapped field. Finally, both numerical and experimental methods were used to analyze the working mechanism of the hybrid trapped field magnet. Conclusions of this paper show that the hybrid trapped field magnet is a potential concept to fabricate low cost, high performance magnets, and the “wind-and-flip” technology combined with PCS technique is a reliable way to improve the working performance as well as reduce the total cost magnetization facilities.