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MPINP:
Präzisionsexperimente - Abteilung Blaum
Abstract:
Electron beam ion traps (EBIT) are experimental setups for the production, analysis and
extraction of highly charged ions (HCI). High precision measurements of fundamental
constants, like the g factor in the Penning-trap experiment Alphatrap, benefit from
the properties of HCI. For inner shell electrons in heavy HCI, the electric field that the
electron experiences close to the nucleus reaches values up to 10−16V/cm. Investigating
this strong interaction by measuring the properties of the bound electron therefore allows
to test QED in extreme conditions. An EBIT capable to inject hydrogenlike HCI up
to uranium into the Alphatrap Penning-trap setup would allow these tests. In the
scope of this thesis the Hyper-EBIT, intended to provide this capability in the future,
was recommissioned. After a long shutdown all of the Hyper-EBITs critical components
were tested. Further the space charge compensation of the beam was determined through
the study of dielectric recombination of He-like to O-like argon ions. In the process the
successful operation at moderate beam energies of 7 keV and beam currents of up to 120
mA was demonstrated. This serves as preparations for the aimed beam energies of 300 keV, as the necessary high voltage components are currently under development.
