Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 20: Precision spectroscopy of atoms and ions III

A 20.7: Talk

Wednesday, March 11, 2020, 15:45–16:00, f303

Towards efficient sympathetic laser cooling of highly charged ions in a Penning trap — •Felix Hahne, Bingsheng Tu, Alexander Egl, Tim Sailer, Ioanna Arapoglou, Andreas Weigel, Fabian Heiße, Sven Sturm, and Klaus Blaum — Max-Planck-Insitut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

The electric fields of highly charged ions (HCI) enable stringent tests of bound-state quantum electrodynamics under extreme conditions. The Penning-trap based Alphatrap experiment at the Max-Planck-Institut für Kernphysik in Heidelberg aims for g-factor measurements of HCI’s as well as laser spectroscopy of fine or hyperfine structure transitions. The achievable accuracy in those measurements depend strongly on the motional temperature of the ion.
However, direct laser cooling of the HCI is generally hindered by the absence of suitable optical transitions and co-trapping ions for sympathetic cooling would disturb the HCI’s trap eigenmotion. To this end we propose the coupling of two ions in different traps via a common tank circuit. We discuss the electronic avoided crossing coupling scheme and present the first experimentally recorded energy transfer between Kr²³⁺ and Ar¹¹⁺ coupled by a common tank circuit, which lays the basis for a novel sympathetic cooling technique.