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@INPROCEEDINGS{Lieutenant:1043661,
      author       = {Lieutenant, K. and Beule, F. and Robledo, J. and Violini,
                      Nicolo and Voigt, J. and Zakalek, P.},
      title        = {{T}he neutron instrument simulation package {VITESS}},
      reportid     = {FZJ-2025-02963},
      year         = {2025},
      abstract     = {VITESS is an open source software package for the
                      simulation of neutron instruments and virtual neutron
                      experiments. It allows simulating practically all components
                      used in current neutron scattering instruments and thus
                      simulating all kinds of instruments at existing neutron
                      sources. The code has been migrated to a GIT server at
                      Forschungszentrum Jülich (FZJ), where automatic deployment
                      and testing of the program has been enabled to facilitate
                      releases. Testing is realized by a number of dedicated test
                      instruments to keep the program error-free. In VITESS,
                      instruments are usually first designed using a GUI and then
                      further optimized using scripts exported from the GUI. The
                      upcoming version 4 will also contain a tool to develop
                      instruments using python, and the possibility to change any
                      parameter during a simulation to improve its use in digital
                      twins. The graphics tool GR from FZJ is now the standard
                      tool to visualize monitor output.Version 3.7 contains two
                      new source modules for better integration with neutronic
                      simulation software to facilitate a wholistic optimization
                      of instrument and source: KDSource, which increases the
                      number of neutron trajectories using the kernel density
                      estimator method, and AISource; which creates a function to
                      define the moderator characteristic using AI. It also offers
                      a new module to simulate prisms. The monochromator module
                      allows simulating monochromator rotations and oscillations.
                      The module for inelastic samples can now handle spin
                      dependent scattering. NeXus output is included to enable
                      processing simulated data just as real data.Vitess is a
                      Monte Carlo particle tracing software that allows to
                      simulate the majority of the existing neutron instruments at
                      both continuous and pulsed sources. Its modules are
                      thoroughly tested and have shown equal results when
                      benchmarked with other Monte Carlo software. It is under
                      active development, bringing new methodologies to the Monte
                      Carlo simulation community.},
      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-HBS / JCNS-ESS / JSC / JCNS-1},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-HBS-20180709 /
                      I:(DE-Juel1)JCNS-ESS-20170404 / I:(DE-Juel1)JSC-20090406 /
                      I:(DE-Juel1)JCNS-1-20110106},
      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)24},
      url          = {https://juser.fz-juelich.de/record/1043661},
}