Freiburg 2024 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster V

A 26.5: Poster

Mittwoch, 13. März 2024, 17:00–19:00, Tent C

The way towards low-energy, heavy, highly charged ions: the Hitrap deceleration facility — •Nils Stallkamp for the Hitrap collaboration — GSI Helmholtzentrum für Schwerionenforschung GmbH, Darmstadt — Institut für Kernphysik, Goethe Universität Frankfurt am Main

The HITRAP facility, located at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, is designed to decelerate and cool heavy, highly charged ions (HCI) created by the GSI accelerator complex and make them accessible at low energies for precision experiments. The system consists of a two-stage deceleration structure, an interdigital H-type linac (IH) and a radio-frequency quadrupole (RFQ), followed by a cryogenic Penning-Malmberg trap for subsequent ion cooling. The deceleration stages reduce the ion energy from 4 MeV/u to 500 keV/u and to 6 keV/u respectively, before forwarding a slow, but hot ion bunch towards the cooling trap. The trap is operated in a so-called nested configuration, in which the electrons, created by an external photo-electron source, are stored simultaneously with the HCI and serve as cold thermal bath.
Recently, the first indications of electron cooling of locally-produced HCI in a Penning trap could be achieved, a major milestone towards heavy HCI at eV and sub-eV energies. We will present the current status of those measurements as well as upcoming steps for further systematic studies of the cooling process.

Keywords: Ion traps; Highly charged ions; Deceleration; Ion cooling