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@ARTICLE{Tatsumoto:1006439,
      author       = {Tatsumoto, H. and Lyngh, D. and Lee, Y. and Hartl, M. and
                      Sina, H. and Beßler, Y. and Kobayashi, H. and Sakamoto, Y.
                      and Hasegawa, T.},
      title        = {{D}esign of an in-situ measurement system for ortho and
                      para liquid hydrogen fractions at {ESS}},
      journal      = {IOP conference series / Materials science and engineering},
      volume       = {1240},
      number       = {1},
      issn         = {1757-8981},
      address      = {London [u.a.]},
      publisher    = {Institute of Physics},
      reportid     = {FZJ-2023-01673},
      pages        = {012117 -},
      year         = {2022},
      abstract     = {The Cryogenic Moderator System (CMS) is equipped with a
                      catalyst to convert hydrogen from the ortho state to the
                      para state, to keep desirably high parahydrogen fractions in
                      the cold moderators, which is required to deliver a high
                      brightness cold neutron beams to the scientific instruments
                      using neutron scattering. An in-situ measurement system for
                      the ortho and para fractions of liquid hydrogen (OPMS) where
                      a Raman spectroscopy will be used is being developed. The
                      required measurement precision is $0.1\%$ to detect an
                      undesirable shift towards a high orthohydrogen fraction
                      caused by neutron scattering driven para-to-ortho back
                      conversion. The dedicated OPMS sampling line has been
                      designed and is placed in a bypass line from and to the CMS
                      to minimize the hydrogen inventory and to make it physically
                      isolated from the CMS if a sapphire window failure happens.
                      Accident analysis for a hydrogen leak due to the sapphire
                      window failure was carried out using an inhouse-developed
                      simulation code, and the required safety relief size has
                      been determined.},
      cin          = {ZEA-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ZEA-1-20090406},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1088/1757-899X/1240/1/012117},
      url          = {https://juser.fz-juelich.de/record/1006439},
}