Abstract
We present an experimental scheme of a cold atom space clock witha movable cavity. By using a single microwave cavity, we find that theclock has a significant advantage, i.e. the longitudinal cavity phaseshift is eliminated. A theoretical analysis has been carried out interms of the relation between the atomic transition probability and thevelocity of the moving cavity by taking into account the velocitydistribution of cold atoms. The requirements for the microwave powerand its stability for atomic π/2 excitation at differentmoving velocities of the cavity lead to the determination of the properworking parameters of the rubidium clock in frequency accuracy10−17. Finally, the mechanical stability for the scheme isanalysed and the ways of solving the possible mechanical instability ofthe device are proposed.
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