The Zeeman-slower Used For ⁸⁷Sr Optical Lattice Clock

⁸⁷Sr optical lattice clock is a new type of atomic clock that uses trapped atoms and optical comb. By using of the optical comb we can easily and accurately measure the laser frequency and give the Radio Frequency signal out. The accuracy of the optical clock is expected to reach the threshold level 10^-18 and ⁸⁷Sr optical lattice clock is thought to have the most development potential in the next few decades. This paper mainly discusses the cold atom experimental apparatus of the strontium-optical lattice clock, describe how to design the Zeeman-slower the accomplished works are as follows:(1) We design a magnetic field used for ⁸⁷Sr atom beam. A tower shape coil is manufactured according to the simulated value of the layers, the turns, the current and other parameters. Experiment measured the magnetic field of the tower coils, and optimizes the magnetic field by comparing the measured curve and the theoretical curve. At the end the measured result of its longitudinal magnetic field satisfied the requirement of ⁸⁷Sr optical lattice clock experiment. The effective length of the Zeeman slower is 27 cm, the decelerated range of the atom is from 400 m/s to 50 m/s, and its capture speed is 530 m/s.(2) We design a special magnetic field gradient used for traping Sr atoms. The magnetic field gradient is linear change in the center of the trap. We can easily change the magnetic field gradient by changing the current of the anti-Helmholtz coils to satisfy the requirements of trapping atoms.(3) An ultrahigh-vacuum chamber is designed use multi-stage vacuum pump system. Ultrahigh-vacuum degree has been achieved without heating the furnace: Laser frequency stabilization vacuum tube 10^-8Pa, magneto-optical trap 10^-8Pa, nearby the furnace 10^-9 Pa, it is entirely satisfied cooling and trapping of atoms, as well as the higher level cooling.