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Acta Sinica Quantum Optica

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

樊浩 FAN Hao, 王鹏军 WANG Peng-jun, 张靖 ZHANG Jing

Published Jan 1, 2015• 2 citations
Publisher
DOI
10.3788/asqo20152104.0351

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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.
A new scheme to realize a two-dimensional (2D) array of magnetic micro-lenses for a cold atomic beam, formed by an array of square current-carrying wires, is proposed. We calculate the spatial distributions of the magnetic fields from the array of current-carrying wires and the magnetic focusing potential for cold rubidium atoms, and study the dynamic focusing processes of cold atoms passing through the magnetic micro-lens array and its focusing properties by using Monte-Carlo simulations and trajectory tracing method. The result shows that the proposed micro-lens array can be used to focus effectively a cold atomic beam, even to load ultracold atoms or a BEC sample into a 2D optical lattice formed by blue detuned hollow beams.