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@PHDTHESIS{Dimroth:1008827,
      author       = {Dimroth, Anton},
      othercontributors = {Natour, Ghaleb and Singheiser, Lorenz and Kowalski, Julia},
      title        = {{A}uslegung einer {L}ager- und {A}ntriebseinheit für ein
                      neuartiges {R}öntgentarget zur {S}trahlentherapie},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      publisher    = {RWTH Aachen University},
      reportid     = {FZJ-2023-02499},
      pages        = {pages Online-Ressource |b Illustrationen, Diagramme},
      year         = {2023},
      note         = {Dissertation, RWTH Aachen, 2023},
      abstract     = {Cancer is one of the major health problems in Europe and
                      leads to enormous socioeconomic burdens. In 2019, 1.55
                      million people in the EU died from cancer, and $50\\%$ of
                      all cancer patients receive radiotherapy during the course
                      of their disease. Microbeam radiation therapy is a promising
                      approach to successfully minimize the damage to healthy
                      tissue. Preclinical research with MST only became possible
                      with the advent of large synchrotron facilities in the
                      1990s. However, these costly research facilities are
                      unsuitable for widespread use in the healthcare system,
                      leaving an unmet need for compact sources of microbeam
                      therapy. The core of this work is the design and
                      construction of a bearing and drive unit of a novel x-ray
                      target for a compact microbeam source prototype. In addition
                      to the historical development of x-ray sources, a principal
                      design system is described in which the three bearing
                      variants: rolling bearings, magnetic bearings and sliding
                      bearings are compared on the basis of their technical
                      characteristrics. The principle of a liquid metal lubricated
                      plain bearing provided the best compromise with respect to
                      the given requirements. For the design of the bearing
                      system, the state of the art is analyzed based on a
                      literature review. The relevant fundamentals for modeling
                      the bearing, taking turbulence and cavitation into account,
                      are presented. A recalculation and comparison with other
                      models from the literature is carried out using numerical
                      methods and an analytical solution of the pressure
                      distribution. Based on this, the optimized parameters for
                      the bearing of the rotating anode are calculated. In
                      addition, the influences of frictional heat, manufacturing
                      aspects of the bearing and corrosion due to the liquid metal
                      are discussed and preventive measures are taken. With the
                      bearing calculation completed, the design, construction and
                      calculation of the drive train with target connection is
                      carried out, which consists of two rotating rotor carriers
                      running concentrically around a stationary axis. The liquid
                      metal bearing is formed between the axis and the rotating
                      anode. An asynchronous machine with a separation tube as
                      vacuum boundary drives the rotor. As part of a preliminary
                      test, the behaviour of the liquid metal when it is filled
                      into a vacuum chamber is investigated. For the overall
                      system integration, which consists of a total of 4635
                      individual parts, the construction and assembly within a
                      radiation protection cabinet is considered and the boundary
                      conditions are planned and carried out.},
      keywords     = {microbeam radiotherapy , spiral groove bearing , liquid
                      metal bearing , X-ray (Other)},
      cin          = {ZEA-1},
      cid          = {I:(DE-Juel1)ZEA-1-20090406},
      pnm          = {899 - ohne Topic (POF4-899) / DFG project 416790481 -
                      Tumortherapie mit Mikrostrahlen an kompakter Strahlenquelle
                      (416790481)},
      pid          = {G:(DE-HGF)POF4-899 / G:(GEPRIS)416790481},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2023-02240},
      url          = {https://juser.fz-juelich.de/record/1008827},
}