On the single-state selection for H-maser and its signal application for fountain atomic standard

It is well known one of the way to ensure a presence only operating atoms in the storage bulb is a method associated with Majorana transition. To implement this method a magnetic field created by two Pseudo-Helmholtz coils, that are placed at the region between state selection magnets, is used. With this shape of the total field in mind it is extremely important to know transverse (in regard to the atomic beam axis) coordinates of the region where the field change its sign, and the magnitude of the field gradient in this region. In the paper the dependences of H-maser's selection state system quality factor on the value of the magnetic field gradient and on the transverse coordinate of its zero value are calculated and examined. The extreme values of this parameters when a single-state selection does not work are defined. Moreover, the hydrogen beam intensity is a intrinsic value for Power Spectral Density of the H-maser's output signal. In the second part of the paper a principal circuit for using the output signal to create interrogation waveform (a synthesizer) for Rb atomic fountain is discussed, quantity of the Dick effect is calculated. It is shown achievable fountain's stability due to a technical noise of such RF synthesizer can reach 6·10-14 for 1 sec.