Abstract
Presents a theoretical analysis of a hexapole magnet used for state selection and focusing of the F=1, mF=0 hyperfine state in hydrogen masers. The analysis determines the relative importance of the magnet properties and the geometry of the beam system in providing state selection and focusing. This in turn shows how the system may be optimised for minimum hydrogen flow at a given level of maser oscillation, thereby improving frequency stability (via reduction of the spin exchange interaction) and increasing operating time for a given volume of hydrogen gas.
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