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Design challenges and performance of nested neutron mirrors for microfocusing on SNAP
Author(s) -
Ice Gene E.,
Pang Judy W. L.,
Tulk Chris,
Molaison Jamie,
Choi JaeYoung,
Vaughn Cody,
Lytle Lauren,
Takacs Peter Z.,
Andersen Ken H.,
Bigault Terry,
Khounsary Ali
Publication year - 2009
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889809037595
Subject(s) - neutron , beamline , physics , optics , context (archaeology) , spallation , beam (structure) , neutron source , nuclear physics , paleontology , biology
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 ∼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.