用于超冷原子强磁场中空方铜线圈的设计

The Design of Hollow Square Copper Wires for Strong Magnetic Field in Ultra-cold Atoms

采用中空的矩形截面的方铜线设计并制作了一对线圈,用于超冷原子的磁阱俘获和原子Feshbach共振偏置磁场。实验上测量了线圈在霍姆赫兹和反霍姆赫兹组态下产生的磁场,给出了线圈之间距离等因素对磁场空间分布的影响。数值模拟了线圈在反霍姆赫兹组态下所产生磁场的空间均匀度,确定了均匀度最佳时线圈间距等因素的优化值。同时计算了线圈的工作功率和水冷所需的流速和压强。

A pair of coils were made by hollow square copper wires with a rectangular transversal surface,which can be used to realize the trap for ultra-cold atoms and control of interaction among atoms by Feshbach resonance.We experimentally measured the magnetic field strength created by coils in Helmholtz and anti-Helmholtz configuration,and payed spcial attention to the factors such as spacing between two coils which influences the spatial distribution of magnetic field strength.At the same time,we calculated numerically the magnetic field strength in anti-Helmholtz configuration and presented the optimal value such as spacing when the uniformity of magnetic field strength was the best.With compari the measured and the simulated data,it is well-paralized with each other.Simultaneously working power of coils was calculated,as well as water speed and pressure for cooling coils.