% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@PHDTHESIS{Wiesel:211854,
      author       = {Wiesel, Marco},
      othercontributors = {Birkl, Gerhard and Quint, Wolfgang},
      title        = {{P}reparation and {I}nvestigation of {H}ighly {C}harged
                      {I}ons in a {P}enning {T}rap for the {D}etermination of
                      {A}tomic {M}agnetic {M}oments},
      school       = {Technische Universität Darmstadt},
      type         = {Dissertation},
      reportid     = {GSI-2018-00734},
      pages        = {147},
      year         = {2017},
      note         = {Dissertation, Technische Universität Darmstadt , 2017},
      abstract     = {The ARTEMIS experiment aims at measuring magnetic moments
                      of electrons bound in highly charged ions that are stored in
                      a Penning trap. It will provide access to effects of quantum
                      electrodynamics (QED) in the extreme fields close to an
                      ionic nucleus. Additionally, due to the high magnetic field
                      of the Penning trap, higher-order Zeeman effects can be
                      examined and therefore provide a different access to the
                      theory of QED. In this work, a cooled cloud of boron-like
                      argon ions, Ar13+, was prepared in the creation part of a
                      double Penning trap held at cryogenic temperatures.
                      Systematic measurements were carried out in order to
                      investigate the creation trap and its specific parameters to
                      generate a suitable ion cloud. This ion cloud consisted
                      after further charge breeding of different charge states. It
                      was then cooled and parts of it were excited by the
                      SWIFT-technique and, in combination with fast
                      potential-switching, all ion species except Ar13+ were
                      removed. Together with the successful transport of an ion
                      cloud from the creation trap into the spectroscopy trap all
                      concepts necessary in order to prepare an Ar13+ ion cloud
                      for performing laser microwave double-resonance spectroscopy
                      have been implemented. Additionally, a measurement of the
                      modified cyclotron frequency in the creation trap was
                      carried out by exciting the ions radially while detecting
                      their axial motional frequency. Thus, a value for the
                      magnetic field strength in the creation trap with a 5
                      parts-per-million accuracy was achieved. A system for
                      irradiating microwaves with a frequency of 65 gigahertz onto
                      the position of the ions was developed, characterized and
                      implemented into the apparatus. It was conceptualized for
                      meeting the challenging conditions of the experiment, such
                      as the high magnetic field, the cryogenic temperatures and
                      the difficult geometry. A novel concept of employing an
                      indium tin oxide (ITO)-coated window as an endcap for a
                      closed Penning trap was implemented in the spectroscopy trap
                      and its functionality was proven. The window improves the
                      fluorescence photon efficiency by at least $17\%$ and
                      increases the planarity over the previously used mesh and
                      therefore decreases the trap anharmonicities. Additionally,
                      a test of the ITO-coated window proved its applicability as
                      a Faraday cup for detecting highly charged ions. During this
                      thesis, experimental studies of the various components of
                      ARTEMIS have been carried out and the full apparatus was
                      assembled and put into operation. The focus of this work was
                      the design of the mechanical parts and their assembly, such
                      as the cryogenic concept and the vibrational decoupling. In
                      the future, ARTEMIS will be connected to the HITRAP beamline
                      at GSI, so heaviest highly charged ions can be examined.
                      During this work, a fast opening valve, that separates the
                      trap vacuum from the beamline vacuum, was assembled and
                      initial tests were conducted.},
      cin          = {ATP},
      cid          = {I:(DE-Ds200)ATP-20051214OR020},
      pnm          = {6211 - Extreme States of Matter: From Cold Ions to Hot
                      Plasmas (POF3-621) / HGF-IVF-VH-GS-201 - HGS-HIRe :
                      (HGF-IVF-VH-GS-201)},
      pid          = {G:(DE-HGF)POF3-6211 / G:(DE-Ds200)HGF-IVF-VH-GS-201},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:tuda-tuprints-62803},
      url          = {https://repository.gsi.de/record/211854},
}