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@ARTICLE{Courtois:186692,
      author       = {Courtois, P. and Fernandez-Diaz, M. T. and Nenert, G. and
                      Andersen, K. H. and Freund, A. K. and Gsell, S. and Fischer,
                      M. and Schreck, M. and Link, P. and Meven, M.},
      title        = {{T}he first prototype diamond monochromator at the
                      {I}nstitut {L}aue-{L}angevin},
      journal      = {Journal of physics / Conference Series},
      volume       = {528},
      issn         = {1742-6596},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2015-00764},
      pages        = {012001 -},
      year         = {2014},
      abstract     = {We report on the performance of the first diamond neutron
                      monochromator built at the ILL. It has been designed for the
                      hot neutron diffractometer D9 with the aim of improving
                      significantly the instrument performance in particular for
                      short wavelengths in the 0.3-0.9 Å wavelength range.
                      Diamond crystal plates with dimensions of 1.5 x 1.5 x 0.18
                      cm3 and an average mosaic spread of 0.15° have been
                      synthesized at the University of Augsburg. They exhibited
                      excellent neutron diffraction properties when examined on a
                      neutron double-crystal test setup. Sufficiently thick
                      diamond elements with a controlled mosaic spread of 0.25°
                      have been obtained by stacking several of these crystals.
                      First tests runs carried out at the ILL confirmed the
                      predicted high reflectivity of the diamond stacks. The
                      diamond prototype monochromator uses the (220) reflection in
                      transmission geometry replacing the Cu (220) monochromator
                      on D9 that has the same d-spacing. The final performance
                      studies on D9 showed that the diamond device did not perform
                      better than the original copper crystal. This unexpected
                      result could be explained by significant optical aberrations
                      caused by nonuniformities of both the angular and spatial
                      mosaic distribution in the individual diamond crystals, as
                      revealed by a detailed characterisation study using
                      high-energy X-ray diffraction.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2 / PGI-4 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101 / EXP:(DE-MLZ)NO-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000340245000001},
      doi          = {10.1088/1742-6596/528/1/012001},
      url          = {https://juser.fz-juelich.de/record/186692},
}