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@INPROCEEDINGS{Violini:129125,
      author       = {Violini, Nicolo and Voigt, Jörg and Brückel, Thomas and
                      Babcock, Earl and Salhi, Zahir and Deen, P.},
      title        = {{D}evelopment of a multi-band direct geometry chopper
                      spectrometer for the future {E}uropean {S}pallation
                      {S}ource},
      reportid     = {FZJ-2013-00645},
      year         = {2012},
      abstract     = {Within the ESS Design Update Phase Programme funded by the
                      German Federal ministry of education and research, we
                      investigate the performance of a set of spectrometer
                      concepts at the long pulse source of the ESS, which promises
                      the applicability to a wide manifold of scientific
                      activities of research: strongly correlated electron
                      materials, disordered systems, functional materials,
                      magnetism, soft-matter and biophysics. Here we present the
                      current state-of-the-art in the study of the multi-band
                      instrument concept and describe the main aspects of the
                      conceptual design. The useful beam at the sample position is
                      an important figure of merit in the evaluation of the
                      instrument performance and can represent a limit to possible
                      scientific applications in several circumstances, when high
                      flux is requested. Thus the problem of the beam transport to
                      the sample is under careful consideration, in order to
                      transport as much as possible of the phase space density
                      provided by the source, while maintaining as low as possible
                      the back-ground contamination coming from the direct view of
                      the moderator surface. The chopper system is a crucial
                      aspect in order to achieve useful resolution for a manifold
                      of scientific purposes. The aim is to make an efficient use
                      of the flux provided by the source, by means of the
                      Repetition Rate Multiplication (RRM), while reducing
                      contamination due to very fast and very slow neutrons. We
                      present the chopper layout under investigation and the
                      method for the RRM implementation, based on the commensurate
                      choppers technique. The necessary requirements for the
                      detector development in terms of spatial and time resolution
                      are already evaluated and the implications deriving from
                      technical limitations on this task are discussed.
                      Preliminary results of virtual experiments performed by
                      means of beam neutron ray-tracing simulation packages are
                      presented, in order to show the estimated performances,
                      especially focusing on the resolution function evaluation.
                      Finally we discuss the implications in the use of the
                      polarization analysis for a large band-width instrument.},
      month         = {Sep},
      date          = {2012-09-24},
      organization  = {Deutsche Neutronenstreutagung, GSI
                       Bonn (Germany), 24 Sep 2012 - 26 Sep
                       2012},
      subtyp        = {Other},
      cin          = {ESS / JCNS-2 / PGI-4 / JCNS (München) ; Jülich Centre for
                      Neutron Science JCNS (München) ; JCNS-FRM-II / JCNS-1 /
                      ICS-1},
      cid          = {I:(DE-Juel1)VDB361 / I:(DE-Juel1)JCNS-2-20110106 /
                      I:(DE-Juel1)PGI-4-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ICS-1-20110106},
      pnm          = {451 - Soft Matter Composites (POF2-451) / 422 - Spin-based
                      and quantum information (POF2-422) / 424 - Exploratory
                      materials and phenomena (POF2-424) / 542 - Neutrons
                      (POF2-542) / 544 - In-house Research with PNI (POF2-544) /
                      54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-451 / G:(DE-HGF)POF2-422 /
                      G:(DE-HGF)POF2-424 / G:(DE-HGF)POF2-542 / G:(DE-HGF)POF2-544
                      / G:(DE-HGF)POF2-54G24},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/129125},
}