Fabrication and testing of high-performance all-metal neutron guides and axisymmetric mirrors by electrochemical replica
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.142
Fabrication and testing of high-performance allmetal neutron guides and axisymmetric mirrors by electrochemical replication B. Khaykovich 1, S. Romaine2, A. Ames2*, R. Bruni2, H. A. Ambaye 3, A. Glavic3†, V. Lauter3, D. Engelhaupt4 1
2
Nuclear Reactor Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A.
Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA 02138, U.S.A.
3
Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN, U.S.A.
4
Dawn Research, Huntsville, AL 35824, U.S.A.
ABSTRACT
Neutron scattering is one of the most useful methods of studying the structure of matter, with applications to biomedical, structural, magnetic and energy-related materials. Neutronscattering instruments are installed around research reactors or accelerator-based neutron sources, and neutron guides are critical components of these facilities. They are neutrontransport optical devices consisting of state-of-the-art mirrors often tens of meters long. Here we demonstrate a novel fabrication method of all-metallic neutron guides and axisymmetric
*
Currently at Stanford University, Stanford, CA, U.S.A.
†
Currently at The Paul Scherrer Institute, Villigen, Switzerland
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mirrors by electroplating from precision mandrels. The process allows for the fabrication of single-piece all-metal guides of prismatic and axisymmetric shapes. We also demonstrate supermirror guides and axisymmetric focusing supermirrors produced with the same technology. We present the fabrication and tests of the multilayer-coated replicated guides and optic and show that the mandrel is reproduced with high fidelity and reliability. Such supermirror optics will provide game-changing improvements in neutron techniques.
INTRODUCTION Neutron-scattering techniques require research reactors or accelerator-based installations. These are complex facilities that are normally located at national laboratories, such as Oak Ridge National Laboratory (ORNL) in the US, Institute Laue Langevin in France, J-PARC in Japan, etc. Due to the immense benefits of neutron scattering, such facilities exist around the world and new ones are being constructed or planned. Such facilities consist of a neutron source, surrounded by ten-to-twenty experimental end stations, or instruments. Neutrons are delivered to the instruments with the help of neutron guides, long conduits with reflecting surfaces, which often must extend for tens of meters to transport the neutrons from the source to the instrument with the minimum loss to increase the flux illuminating the samples. Therefore, instrument designers invest significant efforts in optimizing the performance of every component of the instruments. The developm
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