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@INPROCEEDINGS{Nentwich:607326,
      author       = {Nentwich, Melanie},
      title        = {{I}nvestigating different placements of the collimating
                      mirror for the {PETRA} {IV} beamline {A}pp{A}na{XAS}},
      reportid     = {PUBDB-2024-01837},
      year         = {2024},
      abstract     = {PETRA III stands as a premier storage ring X-ray radiation
                      source, offering exceptional capabilities for scientific
                      research. The forthcoming PETRA IV upgrade will further
                      extend the capabilities, empowering researchers to analyze
                      intricate processes occurring within catalysts, batteries,
                      and microchips under realistic operating conditions. The
                      Applied and Analytical quick X-ray Absorption Spectroscopy
                      beamline (AppAnaXAFS), will be one of the first operating
                      beamlines within the second phase of the upgrade, which
                      focuses on the construction and commissioning of the new
                      west hall. The scientific scope of this beamline lies on
                      in-situ and operando analysis of various catalytic processes
                      for efficient conversion among all kinds of application
                      areas, like “energy” (distribution and storage of energy
                      in the form of chemical energy carriers), “green
                      chemistry” (to close the carbon cycle), “earth $\&$
                      environment” (bio-catalysis as part of biotechnology), and
                      “air $\&$ space transportation” (synthetic
                      fuels).Especially for the quick-EXAFS measurements a source
                      with a broad and continuous spectrum is favorable, which is
                      why the use of a 3-pole Wiggler is intended. However, this
                      Wiggler comes at the cost of high divergence and an imminent
                      loss of intensity at various “obstacles” along the
                      beamline, e.g. photon shutters and monochromator. To reduce
                      this loss as much as possible, the use of a collimating
                      mirror before the monochromator is desired. Generally,
                      optical elements like mirrors are placed outside the tunnels
                      to ensure easy maintenance. For PETRA IV, the placement
                      closest to the source, but outside the tunnel would be at 42
                      m. Discussions with the responsible vacuum group revealed a
                      possible position of collimating mirrors at 22 m within the
                      tunnel.In order to evaluate the advantages and disadvantages
                      of the different mirror positions, an extensive x-ray
                      tracing study was performed, considering not only the mirror
                      position, but also different geometries (parabolic,
                      toroidal, bent), lengths, coatings, and two different
                      Wiggler settings.},
      month         = {Mar},
      date          = {2024-03-18},
      organization  = {Annual Meeting of the German
                       Crystallographic Society, Bayreuth
                       (Germany), 18 Mar 2024 - 21 Mar 2024},
      cin          = {FS-PET-D / FS-PET-S},
      cid          = {I:(DE-H253)FS-PET-D-20190712 /
                      I:(DE-H253)FS-PET-S-20190712},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / EURIZON - European network for developing new
                      horizons for RIs (871072)},
      pid          = {G:(DE-HGF)POF4-631 / G:(EU-Grant)871072},
      experiment   = {EXP:(DE-H253)P-P23-20150101 / EXP:(DE-H253)P-P65-20150101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://bib-pubdb1.desy.de/record/607326},
}