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Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 4: Precision spectroscopy of atoms and ions I

A 4.4: Vortrag

Montag, 14. März 2011, 14:45–15:00, BAR 205

Commissioning of HITRAP - A Decelerator for Heavy Highly-Charged IonsNicolaas P.M. Brantjes, •Frank Herfurth, Ludwig Dahl, Oliver Kester, and Wolfgang Quint — GSI, Darmstadt, Germany

Heavy, highly-charged ions (HCI) with only one or few electrons are interesting systems for precision experiments as for instance tests of the theory of quantum electrodynamics (QED). To achieve high precision, kinetic energy and spatial position of the ions have to be well controlled. This is in contradiction to the production process that employs stripping of ele ctrons at high energies by sending relativistic highly-charged ions with still m any electrons through matter. In order to match the production at 400 MeV/u with the requirements of the exper iments - stored and cooled HCI at low energy - the linear decelerator facility H ITRAP has been built at the experimental storage ring (ESR) at GSI in Darmstadt. The ions are first decelerated in the ESR from 400 to 4 MeV/u, cooled and extrac ted. The ion beam phase spaces are then matched to an IH-structure, decelerated from 4 to 0.5 MeV/u before a 4-rod RFQ reduces the energy to 6 keV/u. Finally, the HCI are cooled in a Penning trap to 4 K. Here we present our progress in the commissioning of the IH-Structure and the RFQ over the past year.

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