Rubidium fountains actually launch ions up against gravity so that they are in free fall (in a vacuum, with magnetic fields nulled out) during their sample period. That's not something I can see being miniaturized, or put in use on a moving platform.
Atomic fountains use neutral atoms. It is almost impossible to see the effect of gravity on ions since a single stray electron anywhere in your system creates a way larger Coulomb force.
Fountains need to have a minimum size in order to achieve a sufficient flight time when throwing the atoms up on a ballistic trajectory. Obviously, they also have to be very carefully aligned with respect to gravity.
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Rubidium fountains actually launch ions up against gravity so that they are in free fall (in a vacuum, with magnetic fields nulled out) during their sample period. That's not something I can see being miniaturized, or put in use on a moving platform.
Atomic fountains use neutral atoms. It is almost impossible to see the effect of gravity on ions since a single stray electron anywhere in your system creates a way larger Coulomb force.
Fountains need to have a minimum size in order to achieve a sufficient flight time when throwing the atoms up on a ballistic trajectory. Obviously, they also have to be very carefully aligned with respect to gravity.