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@INPROCEEDINGS{Rcker:1017306,
      author       = {Rücker, Ulrich and Pechenizkiy, Ivan and Li, Jingjing and
                      Chen, Junyang and Vezhlev, Egor and Zakalek, Paul and Voigt,
                      Jörg and Gutberlet, Thomas and Brückel, Thomas},
      title        = {{T}hermal moderator-reflector assembly for {HBS}},
      reportid     = {FZJ-2023-04040},
      year         = {2023},
      abstract     = {The thermal moderator is the key component in a research
                      neutron source to convert the primary neutrons which
                      typically have energies in the MeV regime into useful
                      neutrons for investigations that shall have energies well
                      below 1 eV. In the case of a HiCANS as HBS, the thermal
                      moderator has to be optimized according to the compact
                      target size and to the proton pulse lengths at the different
                      target stations. Extraction channels in the thermal
                      moderator are used to either place cold sources feeding
                      instruments that need a cold neutron spectrum or to extract
                      thermal neutron beams from the volume of highest thermal
                      neutron flux density. Requirements of restricted space,
                      neutron transparency of the main structural materials, the
                      technically demanding flowing liquid thermal moderator
                      material, the complex nature of intense thermal and induced
                      mechanical loading, industry-standard requirements for
                      operational safety, etc. impose important boundary
                      conditions on the design of the thermal moderator.Here, we
                      present the details of a thermal moderator design serving up
                      to 12 instruments at a target station operated at 96 Hz. The
                      thermal moderator consists of a combined welded
                      complex-profiled Al vessel containing 12 thin-walled cast
                      extraction channels arranged in 2 levels. The vessel is
                      filled with H2O as moderator material which is pumped for
                      cooling purposes. The entire system is surrounded by a lead
                      reflector and arranged on top of the compact Ta target. We
                      show the results of simulations concerning the neutronics
                      and the thermal behaviour of this thermal
                      moderator-reflector assembly.This work is part of the
                      collaboration within ELENA and LENS on the development of
                      HiCANS.},
      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 / JARA-FIT / JCNS-FRM-II},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      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/1017306},
}