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

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

2010-11-10

arxiv.org/abs/1011.2369v6

J.Appl.Phys.110:024501,2011

Physics

Atomic Physics

8 pages, 11 figures

Scientific paper

10.1063/1.3605555

We report on a measurement of the characteristic temperature of an ultracold rubidium ion source, in which a cloud of laser-cooled atoms is converted to ions by photo-ionization. Extracted ion pulses are focused on a detector with a pulsed-field technique. The resulting experimental spot sizes are compared to particle-tracking simulations, from which a source temperature $T = (1 \pm 2)$ mK and the corresponding transversal reduced emittance $\epsilon_r = 7.9 X 10^{-9}$ m rad $\sqrt{\rm{eV}}$ are determined. We find that this result is likely limited by space charge forces even though the average number of ions per bunch is 0.022.

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