The hybrid trapped field magnet lens (HTFML), proposed by the authors in 2018, is a promising device that is able to concentrate a magnetic field higher than the applied field continuously, even after removing the external applied field. In this study, we have investigated the optimized performance of the HTFML consisting of a GdBaCuO magnetic lens and a hollow, cylindrical EuBaCuO trapped field magnet (TFM) for various applied fields, B_app, at 77 K using liquid nitrogen. A maximum concentrated magnetic field of B_c = 1.83 T was obtained experimentally in the central bore of the HTFML for B_app = 1.80 T. For B_app higher than 1.80 T, the B_c value decreased, and was lower than the trapped field, B_t, in the single EuBaCuO TFM cylinder from field cooled magnetization. We have individually analyzed the electromagnetic behavior of the HTFML, single TFM hollow cylinder, and single magnetic lens during the magnetizing process using experimental and numerical simulation results. When the B_c value in the HTFML is lower than the B_t value of the single TFM cylinder for an identical B_app, the magnetic lens in the HTFML becomes partially magnetized, resulting in the generation of a negative magnetic field in the opposite direction. As a result, the concentrated field in the HTFML is reduced after the magnetizing process. The optimum applied field, B_app, which is the same magnitude as the maximum trapped field ability of the single TFM cylinder, provides the best performance. The maximum B_c value, and the B_app value that results in this B_c value, are determined by the critical current density, J_c(B), characteristics of the bulk superconducting material used in the magnetic lens and TFM hollow cylinder in the HTFML.

作者在2018年提出了一种混合俘获场磁透镜（HTFML），这是一种很有前途的设备，即使在去除了外部施加磁场之后，它也能够连续地将高于施加磁场的磁场集中。在这项研究中，我们已经调查由各种应用领域中，GdBaCuO磁透镜和中空的圆柱形EuBaCuO俘获场磁铁（TFM）的HTFML的优化的性能乙_应用使用液氮，在77K。 对于B _app  = 1.80 T ，在HTFML的中心孔中通过实验获得了最大集中磁场B _c = 1.83T 。对于高于1.80 T的B _app，B _c磁场冷却的单个EuBaCuO TFM圆柱体中的磁化强度值减小，并且低于捕获的磁场B _t。我们使用实验和数值模拟结果分别分析了HTFML，单个TFM中空圆柱和单个磁透镜在磁化过程中的电磁行为。对于相同的B_应用，当HTFML中的B _c值低于单个TFM圆柱体的B _t值时，HTTFL中的磁透镜会被部分磁化，从而在相反方向上产生负磁场。结果，在磁化过程之后，HTTFL中的集中场减小了。最佳应用磁场B _app与单个TFM圆柱体的最大俘获场能力相同，可提供最佳性能。最大B _c值以及导致该B _c值的B _app值由临界电流密度J _c（B），HTFML中的磁性透镜和TFM中空圆柱体中使用的块状超导材料的特性。