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Conference on Precision Electromagnetic Measurements

Design and construction of Zeeman slower for 87Sr optical clock at NIM

Wang Shaokai, 张远洋 Zhang Yuanyang, Bai-Ke Lin, Wang Min-Ming, Fang Zhanjun

Published Jun 1, 2008• 1 citation
Publisher

Abstract

In this paper, a Zeeman slower suitable for Sr optical clock was designed and constructed through optimizing the winding number. The root mean squared deviations of the experimental data from theoretical data and computed data from theoretical data are both less than 0.5%.
DOI
10.1109/cpem.2008.4574780

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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.
Optical clocks will potentially become the new frequency standard for the SI-definition of the second. Many national metrology institutes around the world have already implemented different versions of such clocks and others are in process of doing so. At SP Technical Research Institute of Sweden, this process has recently begun. This thesis investigates the properties of the Zeeman slower that is to be used as part of the clock. A simple Gaussmeter was constructed from a semiconductor Hall sensor and used to measure the magnetic field profile of the slower. This report also contains the design for an electronic control circuit based on the Arduino platform, which can be used to control the magnetic field. The results showed that the particular slower investigated here will likely not need a control circuit. However, the control circuit can be used in other optical clocks or even in other applications.
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.
NIM-Sr2 optical lattice clock has been developed on the Changping campus of National Institute of Metrology (NIM). Considering the limitations in NIM-Sr1, several improved parts have been designed including a differential pumping stage in the vacuum system, a permanent magnet Zeeman slower, water-cooled anti-Helmholtz coils, an extended viewport for Zeeman slower, etc. A clock laser with a short-time stability better than 3 × 10−16 is realized based on a self-designed 30-cm-long ultra-low expansion cavity. The systematic frequency shift has been evaluated to an uncertainty of 7.2 × 10−18, with the uncertainty of BBR shift and the collisional frequency shift being an order of magnitude lower than the last evaluation of NIM-Sr1.