论文标题
研究强烈的轴向磁场屏蔽，并具有大熔体铸造的BI-2212管
Investigation on intense axial magnetic field shielding with a large melt cast processed Bi-2212 tube
论文作者
论文摘要
使用BI-2212空心缸的屏蔽轴向磁场的可行性在4.2〜k的温度下研究。在1〜t和1.4〜t的外场测量沿着管子轴的残留磁通密度。屏蔽因子定义为管子中心的施加和残留磁通密度之间的比率，在1〜t时为$ 32 \ times 10^4 $，$ 12 \ times 10^3 $在1.4〜t。从考虑管的厚度的测量值中评估了诱导的电流密度。随着时间的推移，测量值的稳定性也得到了解决。进行外部和残余磁通密度的数值模拟，并将其与实验结果进行比较。该研究表明，BI-2212超导体管的高屏蔽性能在4.2〜k至1.4〜t。
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.
