Nuclear spin analogue of a molecular beam maser with cavities in series

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Abstract
The operation of a nuclear spin maser oscillator with two independent resonant coils through which the active maser medium flows in succession is described. It is shown experimentally that the variation of the oscillation amplitude in the second coil as a function of particular parameters of the nuclear maser system is analogous to that obtained with a molecular beam maser operated with two cavities in series. A simple univelocity theory is presented which accounts for the gross features of the experimental results obtained with the two-coil nuclear maser. The influence of the velocity distribution of the nuclei is also investigated.

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