Journal
JOURNAL OF APPLIED CRYSTALLOGRAPHY
Volume 42, Issue -, Pages 1004-1008Publisher
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1107/S0021889809037595
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Funding
- UT-Battelle, LLC [DE-AC05-00OR22725]
- DOE, Division of Materials Sciences and Engineering, Office of Basic Energy Sciences
- DOE, Nuclear and Particle Physics
- DOE Division of Scientific Facilities
- Institut Laue-Langevin, France
- Pohang Accelerator Laboratory, Republic of Korea
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Kirkpatrick-Baez (KB) neutron supermirrors can efficiently focus polychromatic neutron beams to micrometre dimensions. The ultimate size is determined mainly by the perfection of the mirrors and by the size of the beam needed to have sufficient experimental signal. Nested or Montel KB mirrors can collect similar to 2.6 times more beam than standard sequential KB optics, but require good figure perfection at the edge of one mirror. This paper describes the characterization of the figure errors over the important reflective portions of the two mirrors needed for a Montel focusing pair. The measurements are placed in context with theoretical predictions and are used to predict mirror focusing performance. Strategies to improve on the focusing of this class of optics are suggested and early results from these mirrors installed on the Spallation Neutrons at Pressure (SNAP) Beamline 3 at the Spallation Neutron Source (SNS) at Oak Ridge are presented.
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