| 摘要 |
PURPOSE:To reduce a magnetic field leaking in the direction of a microwave resonance section by interrupting the midway of passage in a vacuum of atomic beams by a metallic mesh consisting of a magnetic material, combining the metallic mesh with a magnetic shielding section for the outside of the vacuum and forming a magnetic closed circuit. CONSTITUTION:With an atomic beam device, a beam opening section 22 is interrupted by a metallic mesh 23 using a magnetic material, and closed magnetically. According to such constitution, a leakage magnetic field generated in the beam opening section 22 is reduced because it is concentrated to the inside of the magnetic metallic mesh 23. The wire diameter of a mesh material and mesh size are determined in consideration of the shape of beams used, and the permeability, etc. of the material are selected adequately from the relationship with magnetic field intensity requiring shielding. Numeral 20 represents a nonmagnetic vacuum package connecting a second level selective deflection magnetic field and a microwave resonance section and 21 a magnetic shielding plate. |
