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Bulletin of the American Physical Society

A spin-flip Zeeman slower controlled by a fast feedback circuit

Lichao Zhao, Jie Jiang, Micah Webb, Yingmei Liu

Published Mar 19, 2013• 0 citations
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We present a design of a spin-flip Zeeman slower controlled by a fast feedback circuit for a sodium Bose-Einstein condensate apparatus. We also demonstrate how the efficiency of the slower strongly depends on its intrinsic parameters, and compare these observations with a few theoretical models. Our findings lead to a simple three-step procedure of designing an optimal Zeeman slower for neutral atoms, especially for those atomic species with high initial velocities, such as sodium and lithium atoms.
In this thesis, I present the design and construction of several experimental parts, e.g., a spin-flip Zeeman slower, a fast feedback circuit, and some magnetic field driving circuits. An efficient method of optimizing the slower with our simulation program is explained. I also demonstrate how the efficiency of a slower strongly depends on a few of its intrinsic parameters, such as the intensity of the slowing laser beam and the length of each section in the slower. These findings lead to a simple three-step procedure of designing an optimal Zeeman slower for neutral atoms, especially for those atomic species with high initial velocities, for example lithium atoms.
We present a method of constructing an automatically reconfigurable, modular, electronic Zeeman slower, which is remotely controlled. This setup is used to investigate the ability of different magnetic field profiles to slow thermal atoms to the capture velocity of a magneto-optical-trap. We show that a simple numerical optimization process yields better results than the commonly used approach for deciding on the appropriate field and comes close to the optimum field, found by utilizing a fast feedback loop which uses a genetic algorithm. Our new numerical method is easily adaptable to a variety of existing slower designs and may be beneficial where feedback is unavailable.