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Commissioning of the online transfer beamline for the ALPHATRAP experiment


Egl,  Alexander
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Egl, A. (2016). Commissioning of the online transfer beamline for the ALPHATRAP experiment. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: https://hdl.handle.net/21.11116/0000-0002-559E-D
The novel cryogenic Penning-trap experiment ALPHATRAP is currently set up at
the Max-Planck-Institut für Kernphysik in Heidelberg. ALPHATRAP is a follow-up
experiment of the Mainz g-factor experiment, extending measurements of the bound
electron g-factor to the high-Z regime. This allows, among others for a high-precision
test of bound-state quantum electrodynamics in the extremely strong fields of highly
charged ions. Ions up to hydrogen-like 208Pb81+ are externally produced in the
Heidelberg electron beam ion trap (EBIT) and will be transferred in a ultra-high
vacuum beamline to the Penning trap-setup.
The commissioning and setup of this beamline is the subject of this thesis. A
second compact non-cryogenic EBIT is used as an offline ion source for the test and
commissioning of the beamline and Penning-trap system. It was shown that with this
compact EBIT, bunches of argon ions up to 40Ar15+ can be extracted. For these
ion bunches, the transport through the offline beamline and deceleration, necessary
for the ion injection into the Penning-trap system, were successfully demonstrated.
Results for charge-state distributions from the EBIT and the time of flight of the
ion transport are presented.
For sympathetic laser cooling of the trapped ions in the future, the production of
9Be+ in an external laser ablation source was demonstrated, and an interim in-trap
ion source for the production of 9Be+ was constructed.