Optimization of collisional Feshbach cooling of an ultracold nondegenerate gas

TitleOptimization of collisional Feshbach cooling of an ultracold nondegenerate gas
Publication TypeJournal Article
Year of Publication2015
AuthorsNuske, M, Tiesinga, E, Mathey, L
JournalPhysical Review A
Volume91
Issue4
Pages043626
Date Published2015/04/20
Abstract

We optimize a collision-induced cooling process for ultracold atoms in the
nondegenerate regime. It makes use of a Feshbach resonance, instead of rf
radiation in evaporative cooling, to selectively expel hot atoms from a trap.
Using functional minimization we analytically show that for the optimal cooling
process the resonance energy must be tuned such that it linearly follows the
temperature. Here, optimal cooling is defined as maximizing the phase-space
density after a fixed cooling duration. The analytical results are confirmed by
numerical Monte-Carlo simulations. In order to simulate more realistic
experimental conditions, we show that background losses do not change our
conclusions, while additional non-resonant two-body losses make a lower initial
resonance energy with non-linear dependence on temperature preferable.

URLhttp://arxiv.org/abs/1412.8473v1
DOI10.1103/PhysRevA.91.043626
Short TitlePhys. Rev. A