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We report on a measurement of the characteristic temperature of an ultracoldrubidium ion source, in which a cloud of laser-cooled atoms is converted toions by photo-ionization. Extracted ion pulses are focused on a detector with apulsed-field technique. The resulting experimental spot sizes are compared toparticle-tracking simulations, from which a source temperature $T = (1 \pm 2)$mK and the corresponding transversal reduced emittance $\epsilon_r = 7.9 X10^{-9}$ m rad $\sqrt{\rm{eV}}$ are determined. We find that this result islikely limited by space charge forces even though the average number of ionsper bunch is 0.022.

Measurement of the temperature of an ultracold ion source using time-dependent electric fields