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Journal of Time and Frequency

The Zeeman Slower Magnetic Field for ~(87)Sr Atom

Shougang Zhang

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

A magnetic field of the Zeeman slower is designed for 87Sr atom based on Zeeman effect and Doppler cooling theory with the experimental condition.A spindle-shaped coil is manufactured according to the simulated values of the layers,the turns,the current and other parameters.The measured result shows that the longitudinal magnetic field of the manufactured spindle-shaped coil satisfies the requirement of 87Sr optical lattice clock experiment.

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Conference on Precision Electromagnetic Measurements•Jun 1, 2008•1 citation
A magnetic field of the Zeeman slower is designed for 87Sr atom based on Zeeman effect and Doppler cooling theory with the experimental condition.A spindle-shaped coil is manufactured according to the simulated values of the layers,the turns,the current and other parameters.The measured result shows that the longitudinal magnetic field of the manufactured spindle-shaped coil satisfies the requirement of 87Sr optical lattice clock experiment.
Transverse Zeeman slower composed of an array of permanent magnets is investigated for Sr optical clock. We calculated the magnetic field distribution of 88 Sr atoms based on experimental condition, achieving a reduction of the velocity of atoms from 410 m/s to 50 m/s. The atoms flux through the transverse magnetic field was 7.9×105. Such permanent Zeeman slower needs no high currents or water cooling and the spatial distribution of its magnetic field can be adjusted. Another advantage of this Zeeman slower is its small size and high reliability. Therefore, a miniature Zeeman slower can be attained.
We present a Zeeman Slower used for strontium optical clock.Adding compensatory coil can increase slower actual distance and ultimate magnetic field gradient,thus increasing captured atom number in Strontium first cooling stage(blue MOT).Theoretical analysis Zeeman slower constructed in new method can trapping 31.17% more atoms than made by a single set of coil.We measured the velocity distribution of atomic beam use time-of-flight method.The most probable velocity decreased from 380m/s to 43m/s,the width also become narrower.Experiment study show that two coils Zeeman slower can trap 1.81×10688Sr atoms in first cooling stage.While single coil Zeeman slower can trap 1.26×106 atoms in same experimental condition.Therefore adding compensatory coils increase trapping atom number by 30.4%,consistent with the theoretical analysis.
We report on design and construction of a Zeeman slower for strontium atoms which will be used in an optical atomic clock experiment. The paper describes briefly required specifications of the device, possible solutions, and concentrates on the chosen design. The magnetic field produced by the built Zeeman slower has been measured and compared with the simulations. The system consisting of an oven and Zeeman slower are designed to produce an atomic beam of 10-12 s-1 flux and final velocity of ~30 m/s.
Owing to the different requirements to the magnetic field of magnetic-optical trap for the two different stages of cooling of Sr optical lattice clock,the magnetic field conversion needs to be controlled with a certain sequence within a short time for reducing the fleeing of the atoms in the magnetic field conversion.The theory of the anti-Helmholtz coil is discussed,a design of the magnetic field for the two-stage-cooling of Sr optical lattice clock is presented,and an occurring and controlling device for the magnetic conversion,which mainly contains control circuit and protection circuit,is manufactured.The measurement shows that the current through the coil is controlled by the input signal,meeting the experimental requirements.
We develop a permanent-magnet Zeeman slower with adjustable magnets along the longitudinal and radial directions. Produced by four arrays of cylindrical magnets, the longitudinal magnetic field in the slower is tunable if relevant parameters vary, for example, laser detuning or intensity. The proposed Zeeman slower can be reconfigured for Sr atoms. Additionally, we demonstrate that the residual magnetic field produced by the permanent magnets in the magneto-optical trap region can be as small as 0.5 Gs.