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DESIREE, the double electrostatic storage rings in Stockholm has been running since 2011(?). In the cold (13 K) environment with an excellent vacuum, very long storage times in both rings have been achieved, which has enabled the preparation of beams in a single quantum state. The status of DESIREE is presented with particular emphasis on measurements of stored beam currents in the sub-nA range. We also discuss the ongoing work towards stochastic cooling of very slow beams.
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Simonsson et al. (2017) studied this question.
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