h1

% 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{Poncza:819047,
      author       = {Poncza, Vera},
      othercontributors = {Lehrach, Andreas and Magiera, Andrzej and Stahl, Achim},
      title        = {{E}xtensive optimization of a simulation model for the
                      electric dipole moment measurement at the {C}ooler
                      {S}ynchrotron {COSY}},
      school       = {RWTH Aachen University},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {RWTH Aachen University},
      reportid     = {RWTH-2021-04834},
      pages        = {1 Online-Ressource : Illustrationen, Diagramme},
      year         = {2021},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University; Dissertation, RWTH Aachen University, 2021},
      abstract     = {The excess of matter in the known part of the universe
                      still poses a puzzle to physics and cannot be explained by
                      the Standard Model of particle physics. Many explanation
                      attempts are based on mechanisms that violate CP symmetry.
                      Such mechanisms exist in the Standard Model but are too weak
                      to explain the observed asymmetry. Therefore, additional
                      theories beyond the Standard Model are needed, which are
                      mostly based on additional CP violating sources. Permanent
                      Electrical Dipole Moments (EDMs) of elementary particles
                      violate CP symmetry and are therefore a promising starting
                      point for investigations of the underlying problem. EDMs of
                      charged particles can be studied using storage rings as
                      particle traps, where the polarization behavior of the beam
                      in electric fields provides information about the size of
                      the EDM. The JEDI (Jülich Electric Dipole moment
                      Investigations) collaboration is specialized in the search
                      for EDMs of hadrons using storage rings. It is engaged in
                      design studies for dedicated storage rings for the
                      investigation of protons and deuterons and uses the magnetic
                      storage ring, the cooler synchrotron, COSY at
                      Forschungszentrum Jülich for the first direct deuteron EDM
                      experiment. In this experiment, an EDM leads to a vertical
                      polarization buildup that is directly proportional to the
                      size of the EDM. However, the vertical polarization
                      component is also influenced by systematic effects such as
                      magnet misalignments. In order to investigate systematic
                      effects individually and to support the data analysis, a
                      realistic simulation model is required. In this thesis the
                      development of such a model based on the Bmad software
                      library is presented. Furthermore, various systematic
                      effects and their impact on the spin motion in COSY are
                      investigated and quantified using tracking simulations. The
                      consideration of measured magnet misalignments and their
                      measurement errors results in a minimum resolvable EDM of d
                      = 1.49 · 10−19 e · cm. For a more realistic description
                      of the experimental situation, algorithms are implemented
                      which fit the simulation model to the real conditions by
                      variation of selected machine parameters. The algorithms are
                      successfully tested by means of simulations and afterwards
                      applied to measurement data. The fit results confirm
                      additional magnetic displacements and lead overall to a
                      significantly increased agreement between simulation model
                      and reality.},
      cin          = {133510 / 130000},
      ddc          = {530},
      cid          = {$I:(DE-82)133510_20140620$ / $I:(DE-82)130000_20140620$},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2021-04834},
      url          = {https://publications.rwth-aachen.de/record/819047},
}