% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@INPROCEEDINGS{Violini:129126,
      author       = {Violini, Nicolo and Voigt, Jörg and Brückel, Thomas and
                      Babcock, Earl and Salhi, Zahir and Russina, M. and Rolfs, K.
                      and Simeoni, G. and Lohstroh, W. and Silvi, L. and Deen, P.},
      title        = {{D}evelopment of multi-spectral direct geometry chopper
                      spectrometers for the future{E}uropean {S}pallation
                      {S}ource},
      reportid     = {FZJ-2013-00646},
      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 future 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 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. 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. Preliminary results of virtual
                      experiments performed by means of beam neutron ray-tracing
                      simulation packages are presented, especially focusing on
                      the resolution function evaluation.},
      month         = {Oct},
      date          = {2012-10-08},
      organization  = {JCNS-Workshop "Trends and Perspectives
                       of Neutron Scattering for Soft Matter
                       and Biophysics", Tutzing (Germany), 8
                       Oct 2012 - 11 Oct 2012},
      subtyp        = {Other},
      cin          = {ESS / PGI-4 / JCNS (München) ; Jülich Centre for Neutron
                      Science JCNS (München) ; JCNS-FRM-II / JCNS-2 / JCNS-1 /
                      ICS-1},
      cid          = {I:(DE-Juel1)VDB361 / I:(DE-Juel1)PGI-4-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / 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)6},
      url          = {https://juser.fz-juelich.de/record/129126},
}