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@INPROCEEDINGS{Ma:891749,
      author       = {Ma, Zhanwen},
      title        = {{P}erformance of the guide systems for instruments at the
                      high brilliance source ({HBS})},
      reportid     = {FZJ-2021-01709},
      year         = {2021},
      abstract     = {Low Energy accelerator-driven Neutron sources have the
                      potential to become competitive to research reactors and
                      spallation sources to generate neutron beams for scattering
                      experiments. The Jülich Centre for Neutron Science (JCNS)
                      investigates the concept of a powerful low energy
                      accelerator-driven neutron source called “High Brilliance
                      neutron Source” (HBS), which is aiming at a performance
                      comparable to existing reactor and spallation neutron
                      sources [1]. The target of the HBS will be built as compact
                      as possible to achieve high brilliance and the instruments
                      are grouped around each target station operating at
                      different frequencies.Neutron guides are used to efficiently
                      transport neutrons from a source to a neutron scattering
                      instrument. HBS produces fewer fast neutrons and less amount
                      of high-energy radiation, enabling the use of a compact
                      moderator and shielding structure [2,3]. Therefore, the
                      guide system can be located close to the moderator and a
                      larger phase-space volume can be extracted. Previously,
                      neutron guide with ballistic, elliptical, dual-elliptical,
                      and parabolic geometry was introduced and some has been
                      installed at existing instruments with studied for existing
                      neutron sources with large moderators and a long moderator
                      to guide distance [4–8].However, it is not clear what is
                      the optimal shape, size, and moderator to guide distance for
                      HBS, where the moderator is compact and the moderator to
                      guide can be as small as 30 cm. In this talk, I will present
                      the performance of neutron guide systems for the instrument
                      at the HBS. The guide system for a medium resolution
                      time-of-flight diffractometer for nano-scaled and disordered
                      materials, suggested for the HBS, will be identified as a
                      typical example.[1] Brückel T, Gutberlet T, Baggemann J,
                      Böhm S, Doege P, Fenske J, et al. Conceptual Design Report
                      Jülich High Brilliance Neutron Source ( HBS ). vol. 8.
                      Forschungszentrum Jülich GmbH; 2020.[2] Cronert T, Dabruck
                      JP, Doege PE, Bessler Y, Klaus M, Hofmann M, et al. High
                      brilliant thermal and cold moderator for the HBS neutron
                      source project Jülich. J Phys Conf Ser 2016;746.
                      https://doi.org/10.1088/1742-6596/746/1/012036.[3] Eisenhut
                      S, Klaus M, Baggemann J, Rücker U, Beßler Y, Schwab A, et
                      al. Cryostat for the provision of liquid hydrogen with a
                      variable ortho-para ratio for a low-dimensional cold neutron
                      moderator. EPJ Web Conf 2020;231:04001.
                      https://doi.org/10.1051/epjconf/202023104001.[4] Mezei F.
                      The raison d’être of long pulse spallation sources. J
                      Neutron Res 1997;6:3–32.
                      https://doi.org/10.1080/10238169708200095.[5] Häse H,
                      Knöpfler A, Fiederer K, Schmidt U, Dubbers D, Kaiser W. A
                      long ballistic supermirror guide for cold neutrons at ILL.
                      Nucl Instruments Methods Phys Res Sect A Accel
                      Spectrometers, Detect Assoc Equip 2002;485:453–7.
                      https://doi.org/10.1016/S0168-9002(01)02105-2.[6] Ibberson
                      RM. Design and performance of the new supermirror guide on
                      HRPD at ISIS. Nucl Instruments Methods Phys Res Sect A Accel
                      Spectrometers, Detect Assoc Equip 2009;600:47–9.
                      https://doi.org/10.1016/j.nima.2008.11.066.[7] Hils T, Boeni
                      P, Stahn J. Focusing parabolic guide for very small samples.
                      Phys B Condens Matter 2004;350:166–8.
                      https://doi.org/10.1016/j.physb.2004.04.020.[8] Kleno KH,
                      Lieutenant K, Andersen KH, Lefmann K. Systematic performance
                      study of common neutron guide geometries. Nucl Instruments
                      Methods Phys Res Sect A Accel Spectrometers, Detect Assoc
                      Equip 2012;696:75–84.
                      https://doi.org/10.1016/j.nima.2012.08.027.},
      month         = {Apr},
      date          = {2021-04-15},
      organization  = {Digital Institute Seminar JCNS-2,
                       online event (online event), 15 Apr
                       2021 - 15 Apr 2021},
      subtyp        = {Invited},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-HBS},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-HBS-20180709},
      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)31},
      url          = {https://juser.fz-juelich.de/record/891749},
}