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Detection Electronics Design and First Observation of Bound-Electron Spin Transitions at the ALPHATRAP g-Factor Experiment


Weigel,  Andreas
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Weigel, A. (2019). Detection Electronics Design and First Observation of Bound-Electron Spin Transitions at the ALPHATRAP g-Factor Experiment. PhD Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: https://hdl.handle.net/21.11116/0000-0004-62FB-3
Alphatrap is a Penning-trap based experiment located at the Max-Planck-
Institut für Kernphysik (MPIK). It is dedicated to the exploration of ground-state
properties of heavy, highly charged ions (HCI). The major goal of the alphatrap
experiment are high precision measurements of the bound-electron g-factor. The
comparison of the experimental result with recent theoretical calculations will not
only serve as a sensitive test of bound-state quantum electrodynamics (BS-QED)
but also yields a new approach for the determination of fundamental constants
such as the electron mass or the fine structure constant alpha. The measurement of
the bound-electron g-factor of a single HCI is performed in an optimized cryogenic
double Penning-trap setup, utilizing the continuous Stern-Gerlach effect. For injection
of externally produced HCI up to 208Pb81+ the alphatrap experiment is
coupled to various ion sources, including the Heidelberg Electron-Beam Ion Trap.
This thesis describes the setup and preparation of the alphatrap experiment
on its way towards its first g-factor measurement. In this context a new highly
sensitive detection system was implemented and successfully tested. This enabled
a first commissioning of the whole apparatus with in situ generated HCI as well as
HCI injected through the room temperature beamline. The first-time integration
of an externally operable cryogenic valve allowed for excellent vacuum conditions
with long ion storage times. The implementation of typical ion detection and
manipulation techniques was demonstrated by characterization measurements of
the detection system and the trapping fields. The commissioning culminated
in the first direct observation of induced bound-electron spin transitions at the
alphatrap experiment.