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@INPROCEEDINGS{Maharaj:1031239,
      author       = {Maharaj, Dalini and Li, Jingjing and Baggemann, Johannes
                      and Rücker, Ulrich and Zakalek, Paul and Gutberlet, Thomas},
      title        = {{TOWARDS} {THE} {DEVELOPMENT} {OF} {A} {COMPACT} {VERY}
                      {COLD} {NEUTRON} {SOURCE} {FOR} {THE} {HIGH} {BRILLIANCE}
                      {NEUTRON} {SOURCE}},
      reportid     = {FZJ-2024-05627},
      year         = {2024},
      abstract     = {Very cold neutron (VCN) sources present an exciting
                      opportunity for scientists to access unprecedented length
                      and time scales, and achieve improved sensitivity in neutron
                      experiments [1]. VCNs are defined over a wide spectral
                      range, from 1 meV (9 Å) down to a few hundred neV (>
                      several 100 Å). Wavelengths of up to several tens of Å are
                      of particular interest to many research communities.
                      Recently, thermal scattering kernels were developed for
                      candidate VCN moderator and reflector materials under the
                      HighNESS project [2]. These advances present an opportunity
                      for the conceptual design of VCN sources at newly emerging
                      high-current compact accelerator-driven neutron sources
                      (Hi-CANS). The High Brilliance neutron Source (HBS) is a
                      Hi-CANS project which hosts a linear accelerator delivering
                      a pulsed proton beam of energy, 70 MeV, and peak current,
                      100 mA, to a novel high-power tantalum target and compact
                      target-moderator-reflector (TMR) [3]. A low-dimensional
                      parahydrogen cold moderator has already been designed for
                      the HBS and tested at the JULIC Neutron Platform. Starting
                      from this concept, a Monte Carlo study is underway to
                      develop a target moderator reflector (TMR) to realise a very
                      cold neutron source for the HBS. The low dimensional
                      parahydrogen moderator will serve as an efficient cold
                      neutron converter, and within it, an appropriate secondary
                      moderator is implemented to shift the neutron spectrum
                      generated by the parahydrogen to lower energies, or
                      equivalently longer wavelengths. As methane is known to
                      generate a colder neutron spectrum than parahydrogen, it is
                      currently being investigated to shift the cold spectrum of
                      parahydrogen to lower energies. Figure 1 a.) shows a
                      geometry with parahydrogen only and that with methane
                      embedded in parahydrogen. Figure 1 b.) clearly shows that
                      methane shifts the spectrum to lower energies. Results from
                      a full optimization of this moderator-reflector geometry
                      conducted in PHITS shall be presented. [1] J.M Carpenter and
                      B.J. Micklich, ANL (05/42) (2005).[2] V. Santoro et al,
                      (2023). Nuclear Science and Engineering, 198 31–63
                      (2023)[3] T. Brückel, T. Gutberlet (Eds.), Conceptual
                      Design Report Jülich High Brilliance Neutron Source, ISBN
                      978-3-95806-501-7 (Forschungszentrum Jülich, 2020).},
      month         = {Sep},
      date          = {2024-09-24},
      organization  = {13th Design and Engineering of Neutron
                       Instruments MeetingDENIM XIII, JAEA
                       Tokai Mirai Base, Tokai, Ibaraki
                       (Japan), 24 Sep 2024 - 30 Sep 2024},
      subtyp        = {Invited},
      cin          = {JCNS-2 / JCNS-HBS / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / 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)24},
      url          = {https://juser.fz-juelich.de/record/1031239},
}