Abstract
The so-called ring-shape superconducting trapped field magnet has great potential for commercial application due to its flexible size and joint-less structure. However, due to the spatial asymmetry of the structure, the trapped magnetic field has a non-negligible magnetic declination, which becomes the major obstacle to its application. To compensate the magnetic declination, a new concept of superconducting hybrid magnet consisting of the ring-shape magnet and the HTS bulk is proposed. By adjusting the placement of the HTS bulk in the central air gap, magnetic declination can be effectively compensated. Both experiments and 3D numerical model are used to evaluate the magnetic uniformity after compensation. The results show that the proposed hybrid magnet will have an obvious compensation effect on the magnetic declination. And the hybrid magnets have promising applications with requirements on the uniformity of magnetic field such as potable MRI.
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