标题： 高强度轴向磁场屏蔽的大型熔铸加工Bi-2212管研究 显示英文标题

标题： Investigation on intense axial magnetic field shielding with a large melt cast processed Bi-2212 tube

摘要： 屏蔽轴向磁场至1.4~T的可行性在4.2~K的温度下进行了研究。在外部磁场为1~T和1.4~T时，测量了管子轴线上的残余磁通密度。屏蔽系数定义为管子中心处施加磁通密度与残余磁通密度的比值，在1~T时测得为$32\times 10^4$，在1.4~T时测得为$12\times 10^3$。从测量结果中考虑了管子的厚度评估了感应电流密度。还讨论了测量随时间的稳定性。对外部和残余磁通密度进行了数值模拟并与实验结果进行了比较。研究表明，在4.2~K时，Bi-2212超导管在1.4~T以下具有良好的屏蔽性能。 显示英文摘要

摘要： The feasibility of shielding axial magnetic fields up to 1.4~T, using a Bi-2212 hollow cylinder, is investigated at a temperature of 4.2~K. The residual magnetic flux density along the axis of the tube is measured at external fields of 1~T and 1.4~T. The shielding factor, defined as the ratio between the applied and the residual magnetic flux densities at the center of the tube, is measured to be $32\times 10^4$ at 1~T and $12\times 10^3$ at 1.4~T. The induced current density is evaluated from the measurements taking the thickness of the tube into account. The stability of the measurements over time is also addressed. Numerical simulations for the external and the residual magnetic flux densities are performed and compared to the experimental results. The study shows a high shielding performance of the Bi-2212 superconductor tube at 4.2~K up to 1.4~T.