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@INPROCEEDINGS{Schmidt:1017355,
      author       = {Schmidt, Norberto and Schwab, Alexander and Li, Jingjing
                      and Zakalek, Paul and Rücker, Ulrich and Lieutenant, Klaus
                      and Voigt, Jörg and Damián, José Ignacio Márquez and
                      Granada, Rolando and Dawidowski, Javier and Mauerhofer, Eric
                      and Gutberlet, Thomas and Brückel, Thomas},
      title        = {{O}n the comparison of the experimental neutron cold
                      spectra obtained for various para- and ortho-hydrogen ratios
                      against {M}onte {C}arlo simulations with different codes and
                      nuclear data libraries},
      reportid     = {FZJ-2023-04065},
      year         = {2023},
      abstract     = {The High Brilliance Neutron Source (HBS) project aims to
                      develop a High-Current Accelerator-driven Neutron Source
                      (HiCANS) for neutron scattering, analytics, and imaging. It
                      will feature several thermal and cold sources, including a
                      liquid para-hydrogen moderator. At the Forschungszentrum
                      Jülich, time-of-flight measurements were performed with the
                      prototype of such a cryogenic moderator for different ratios
                      between para- and ortho-hydrogen. In order to optimize the
                      design of future instruments that will use this cold neutron
                      source, accurate simulations of the neutron transport are
                      necessary.This work focuses on the comparison of various
                      simulations performed against the cold spectra experimental
                      results for the different para- and ortho-hydrogen ratios.
                      Several Monte Carlo codes, including MCNP, PHITS, McStas,
                      VITESS, and KDSource, with nuclear data from the
                      ENDF/B-VII.1, JENDL-4.0 and JENDL-5.0 libraries were
                      utilized. The simulations started with the comparison of the
                      proton-neutron yield spectra, continued with coupling the
                      event files before and after the modeling of the neutron
                      guide, and ended with the time-distribution obtained at the
                      detector. A good agreement between simulations and
                      experiments was obtained.The results provide insights into
                      the strengths and limitations of each Monte Carlo code and
                      nuclear data library combination. Not only the observed
                      discrepancies are discussed, but also the potential sources
                      of error are identified. Also, the conclusions will help to
                      improve the accuracy and reliability of neutron cold
                      moderator designs, especially for projects that will deploy
                      a para-hydrogen cold source such as the HBS.},
      month         = {Oct},
      date          = {2023-10-16},
      organization  = {10th Annual Meeting of the Union for
                       Compact Accelerator-driven Neutron
                       Sources, Budapest (Hungary), 16 Oct
                       2023 - 19 Oct 2023},
      subtyp        = {Invited},
      cin          = {JCNS-2 / PGI-4 / JCNS-HBS / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      I:(DE-Juel1)JCNS-HBS-20180709 / $I:(DE-82)080009_20140620$},
      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/1017355},
}