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A: Fachverband Atomphysik

A 36: Ultra-cold atoms, ions and BEC IV (with Q)

A 36.4: Vortrag

Donnerstag, 3. März 2016, 15:15–15:30, f303

Sympathetic cooling of ions inside a radio frequency trap — •Bastian Höltkemeier¹, Pascal Weckesser¹, Henry Lopez¹, Andre de Olivera^1,2, 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).