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@INPROCEEDINGS{Violini:129121,
      author       = {Violini, Nicolo and Voigt, Jörg and Brückel, Thomas and
                      Nemkovskiy, Kirill and Russina, M. and Rolfs, K. and
                      Simeoni, G. and Lohstroh, W. and Silvi, L. and Deen, P.},
      title        = {{D}evelopment of a multi-spectral direct geometry chopper
                      spectrometer for the {E}uropean {S}pallation {S}ource},
      reportid     = {FZJ-2013-00641},
      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 a multispectral
                      wide-band short (50-80m) instrument concept. We describe the
                      main aspects of the instrument conceptual design. The
                      chopper system is a crucial aspect in order to achieve
                      useful resolution for a manifold of scientific purposes,
                      make an efficient use of the flux provided by the source, by
                      means of the Repetition Rate Multiplication and reduce
                      contaminations 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 useful beam at the sample position
                      is an important figure of merit in the evaluation of the
                      instrument performance and can be a limit to possible
                      scientific applications in several circumstances, when high
                      flux is requested. The problem of the beam transport to the
                      sample is under consideration, in order to transport as much
                      as possible of the phase space density provided by the
                      source, maintaining as low as possible the back-ground
                      contamination coming from the direct view of the pulsed
                      source. A comparison on the estimated performance and
                      application limits of different guide geometries is
                      presented. Special consideration is dedicated to the aim of
                      focusing on very small sample size, down to the mm order of
                      magnitude. The technical implications of the polarization
                      analysis option are discussed. 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. Very preliminary results of virtual experiments
                      performed by means of beam neutron ray-trace simulation
                      packages are presented, in order to show the estimated
                      performance of such a concept, especially focusing on the
                      resolution function evaluation.},
      month         = {Apr},
      date          = {2012-04-19},
      organization  = {Science and Scientists @ ESS, Berlin
                       (Germany), 19 Apr 2012 - 20 Apr 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/129121},
}