کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1826635 | 1526472 | 2010 | 4 صفحه PDF | دانلود رایگان |

High-performance neutron-focusing supermirror devices with both high figure accuracy and high reflectivity are essential to effectively collect and focus a neutron beam on a sample without scattering loss. To fabricate these devices, numerically controlled local wet etching and ion beam sputter deposition techniques were developed for the figuring of an aspherical mirror substrate and for the deposition of NiC/Ti multilayers, respectively. By applying these techniques, a plano-elliptical supermirror with a clear aperture size of 90 mm×40 mm was fabricated to focus a cold neutron beam. Focusing performance and reflectivity were evaluated using a neutron reflectometer and a focusing gain of 4.4 and a reflectivity of 0.64–0.7 in the near-critical-angle region for m=4 were achieved.
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 616, Issues 2–3, 1 May 2010, Pages 193–196