Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 55: Ultra-cold atoms, ions and BEC IV (with A)
Q 55.4: Talk
Thursday, March 3, 2016, 15:15–15:30, f303
Sympathetic cooling of ions inside a radio frequency trap — •Bastian Höltkemeier1, Pascal Weckesser1, Henry Lopez1, Andre de Olivera1,2, Ji Luo1, Eric Endres3, Roland Wester3, and Matthias Weidemüller1 — 1Physikalisches Institut, Universität Heidelberg, INF 226, 69120 Heidelberg — 2Departamento de Física, Universidade do Estado de Santa Catarina-Joinville, SC, Brazil — 3Institut f. Ionenphysik und angewandte Physik, Universität Innsbruck, Technikerstraße 25/3, 6020 Innsbruck
Sympathetic cooling has become a powerful and universal method for preparing ultracold ions confined in radio frequency traps. We theoretically investigate the possibility of using laser-cooled atoms as a buffer gas. Recent theories indicate that cooling of ions in radio frequency traps is limited to atom-to-ion mass ratios below unity. Using a localized buffer gas cloud and/or a higher order radio frequency trap this limitation can be overcome. A description of our model and the corresponding cooling limit for experimental applications will be presented. We show how the ion's final temperature can be tuned by adjusting the appropriate experimental parameters, such as the rf-voltage or the atom cloud size (Forced Sympathetic Cooling).