Atomic state selecting system for a hydrogen atom clock

Abstract

The invention provides an atomic state selecting system for a hydrogen atom clock, comprising a collimator, a first state selecting magnet, an atom population transferring device, a second state selecting magnet and an atomic storage bubble sequentially arranged on a horizontal axis. The atom population transferring device comprises a magnetic shield. A first Helmholtz coil and a second Helmholtzcoil which are identical in size and which central axes are coincident with the horizontal axis are provided on one end adjacent to the first state selecting magnet and one end adjacent to the secondselecting magnet, which are in the magnetic shield separately. The first Helmholtz coil and the second Helmholtz coil have current with same amount and opposite flow direction. According to the atomicstate selecting system for a hydrogen atom clock, two state selecting devices and one atomic population transferring device are adopted to realize the singlet selection of the hydrogen atom, therebyimproving the frequency stability of the self-oscillation of the hydrogen atomic clock by improving the purity of the atomic beam flow entering the atomic storage bubble of the hydrogen atomic clock.

Description

technical field [0001] The invention relates to the field of atomic clocks, in particular to an atomic state selection system of a hydrogen atomic clock. Background technique [0002] The Shanghai Astronomical Observatory began to develop hydrogen atomic clocks in 1970, and successfully developed a practical engineering hydrogen atomic clock in 1987. So far, it has been very mature both in theory and in the application of technical reliability. However, compared with similar foreign products, there is still an order of magnitude gap in indicators. [0003] At present, the hydrogen atomic clocks disclosed in the world are mainly through the vacuum environment processing technology and the optimized design of temperature control accuracy to achieve higher indicators. [0004] The transition of the hydrogen atomic clock is the hyperfine magneton energy level of the ground state of the hydrogen atom (F=1, m F =0) and (F=0, m F = 0) between magnetic dipole transitions (F is th...

AI Technical Summary

Problems solved by technology

[0018] But, the shortcoming of prior art does not eliminate exactly (F=1, m F = 1) state atom, and the invalid state atom will have spin exchange collision with the effective atom after entering the storage bubble, which will increase the collision relaxation of the effective atom, and increase the frequency shift of the spin exchange collision, and then directly affect the hydrogen atomic clock. Frequency Stability of Self-excited Oscillation

Images