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@INPROCEEDINGS{Lieutenant:1043658,
      author       = {Lieutenant, K. and Brandl, G. and Felder, C. and Mattauch,
                      S.},
      title        = {{V}irtual experiments in live mode by running digital twins
                      of {MLZ} instruments using {VITESS}},
      reportid     = {FZJ-2025-02960},
      year         = {2025},
      abstract     = {In the beginning, neutron instrument simulation software
                      was mainly used to optimize instrument designs in terms of
                      high flux and favorable beam properties at the sample
                      position. Then it was extended to virtual experiments by
                      adding sample and detector in the simulation. They are used
                      to check the instrument performance in terms of the final
                      output, to test data evaluation software and to find the
                      best instrument settings for planned real experiments. Now,
                      the neutron facilities have started running digital twins of
                      their instruments, among them the Maier-Leibnitz Zentrum
                      (MLZ) running the FRM-II reactor in Garching close to
                      Munich.In a present project at MLZ, digital twins are
                      developed that are based on the simulation program VITESS.
                      The simulations are embedded in the NICOS operation system,
                      which is used to run real experiments. It allows changing
                      parameters (like slit sizes, device positions, etc.) during
                      the simulation so that a virtual experiment is operated like
                      a real experiment and is ideally also as fast – we have
                      called it ‘live mode’. This is realized by reading an
                      interface during the simulation and changing the simulation
                      parameters on the fly.Both, the integration of the VITESS
                      simulation into NICOS and the parameter change on the fly
                      work. It is realized for the reflectometer MARIA, the
                      diffractometer POWTEX and the time-of-flight spectrometer
                      TOPAS.As a virtual experiment appears like a real
                      experiment, it enables training of users before the
                      beamtime, which - in combination with testing instrument
                      settings - allows a much more efficient use of the beamtime.
                      Therefore, it is planned that all MLZ instruments have
                      digital twins for testing and training purposes, either
                      based on VITESS or on McStas simulations.},
      month         = {Jul},
      date          = {2025-07-06},
      organization  = {The International Conference on
                       Neutron Scattering, Bella Center in
                       Copenhagen, Denmark, with the last day
                       at the European Spallation Source (ESS)
                       in nearby Lund, Sweden (Denmark), 6 Jul
                       2025 - 10 Jul 2025},
      subtyp        = {Invited},
      cin          = {JCNS-2 / JARA-FIT / JCNS-FRM-II / JCNS-4},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-4-20201012},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1043658},
}