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A Laser Ion Source for the Alphatrap Experiment


Sailer,  Tim
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Sailer, T. (2017). A Laser Ion Source for the Alphatrap Experiment. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

The Penning-trap experiment Alphatrap, where the first single in-trap produced ions could be observed recently, is located at the Max-Plack-Institut für Kernphysik in Heidelberg. Alphatrap is a follow-up to the Mainz g-factor experiment with the aim to measure the g-factor of the bound electron in heavy ions up to hydrogenlike 208Pb81+. These ions are externally produced and will be injected into the trap via an ultra-high vacuum beamline. To increase the precision of the future measurements, sympathetic laser cooling via 9Be+ ions is to be implemented into the setup. This will remove temperature as one of the main limitations of current measurement precision as well as allowing completely new measurement schemes by cooling to the few mK range. The production of beryllium ions requires a dedicated ion source. For this purpose, a laser ion source (LIS) was designed, built and tested in the context of this thesis and will be implemented in the existing beamline. The LIS has shown to successfully produce and allow an extraction of about 3 × 107 9Be+ ions per laser pulse. The yield and the beam quality of the produced ions fulfills the required conditions of the Alphatrap experiment.