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@PHDTHESIS{Cazan:49421,
      author       = {Cazan, Radu Mircea},
      title        = {{L}ogin to {H}ei{DOK} {P}reparation of cold {M}g + ion
                      clouds for sympathetic cooling of highly charged ions at
                      {SPECTRAP}},
      school       = {Johannes Gutenberg Universität Mainz},
      type         = {Dr.},
      address      = {Mainz},
      publisher    = {Johannes Gutenberg Universität Mainz},
      reportid     = {GSI-2013-01050},
      pages        = {128 p.},
      year         = {2012},
      note         = {http://ubm.opus.hbz-nrw.de/volltexte/2012/3073/; Johannes
                      Gutenberg Universität Mainz, Diss., 2012},
      abstract     = {The bound electrons in hydrogen-like or lithium-like heavy
                      ions experience extremely strong electric and magnetic
                      fields in the surrounding of the nucleus. Laser spectroscopy
                      of the ground-state hyperfine splitting in the lead region
                      provides a sensitive tool to test strong-field quantum
                      electro dynamics (QED), especially in the magnetic sector.
                      Previous measurements on hydrogen-like systems performed in
                      an electron-beam ion trap (EBIT) or at the experimental
                      storage ring (ESR) were experimentally limited in accuracy
                      due to statistics, the large Doppler broadening and the ion
                      energy. The full potential of the QED test can only be
                      exploited if measurements for hydrogen- and lithium-like
                      ions are performed with accuracy improved by 2-3 orders of
                      magnitude. Therefore, the new Penning trap setup SPECTRAP -
                      dedicated for laser spectroscopy on trapped and cooled
                      highly charged ions - is currently commissioned at GSI
                      Darmstadt. Heavy highly charged ions will be delivered to
                      this trap by the HITRAP facility in the future. rnrnSPECTRAP
                      is a cylindrical Penning trap with axial access for external
                      ion injection and radial optical access mounted inside a
                      cold-bore superconducting Helmholtz-type split-coil magnet.
                      To reach the targeted accuracy in laser spectroscopy, an
                      efficient and fast cooling process for the highly charged
                      ions must be employed. This can be realized by sympathetic
                      cooling with a cloud of laser-cooled light ions. Within this
                      thesis work, a laser system and an ion source for the
                      production of such a 24Mg+ ion cloud was developed and
                      commissioned at SPECTRAP. An all-solid-state laser system
                      for the generation of 279.6 nm light was designed and built.
                      It consists of a fiber laser at 1118.5 nm followed by
                      frequency quadrupling using two successive second-harmonic
                      generation stages with actively stabilized ring resonators
                      and nonlinear crystals. The laser system can deliver more
                      than 15 mW of UV laser power under optimal conditions and
                      requires little maintenance. rnAdditionally, a Mg+ ion
                      source based on the electron-impact ionization of a Mg
                      atomic beam was developed for pulsed injection into the
                      trap. It was demonstrated that it delivers ion bunches with
                      small time, momentum and energy spread, and it was used in
                      combination with the laser system to create the first clouds
                      of up to 2600 laser-cooled Mg+ ions in SPECTRAP.
                      Fluorescence detection of the ions as well as electronic
                      detection using the FFT-ICR technique was demonstrated. The
                      analysis of the fluorescence lineshape indicated single-ion
                      sensitivity and that a final temperature of about 100 mK was
                      reached within a few seconds of cooling.},
      keywords     = {Dissertation (GND)},
      cin          = {ATP},
      cid          = {I:(DE-Ds200)ATP-20051214OR020},
      pnm          = {544 - In-house Research with PNI (POF2-544) /
                      HGF-IVF-VH-GS-201 - HGS-HIRe : (HGF-IVF-VH-GS-201)},
      pid          = {G:(DE-HGF)POF2-544 / G:(DE-Ds200)HGF-IVF-VH-GS-201},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hebis:77-30739},
      url          = {https://repository.gsi.de/record/49421},
}