skip to main content

SciTech ConnectSciTech Connect

Title: Figure correction of a metallic ellipsoidal neutron focusing mirror

An increasing number of neutron focusing mirrors is being adopted in neutron scattering experiments in order to provide high fluxes at sample positions, reduce measurement time, and/or increase statistical reliability. To realize a small focusing spot and high beam intensity, mirrors with both high form accuracy and low surface roughness are required. To achieve this, we propose a new figure correction technique to fabricate a two-dimensional neutron focusing mirror made with electroless nickel-phosphorus (NiP) by effectively combining ultraprecision shaper cutting and fine polishing. An arc envelope shaper cutting method is introduced to generate high form accuracy, while a fine polishing method, in which the material is removed effectively without losing profile accuracy, is developed to reduce the surface roughness of the mirror. High form accuracy in the minor-axis and the major-axis is obtained through tool profile error compensation and corrective polishing, respectively, and low surface roughness is acquired under a low polishing load. As a result, an ellipsoidal neutron focusing mirror is successfully fabricated with high form accuracy of 0.5 μm peak-to-valley and low surface roughness of 0.2 nm root-mean-square.
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. Ultrahigh Precision Optics Technology Team, RIKEN Center for Advanced Photonics (RAP), RIKEN, Wako, Saitama 351-0198 (Japan)
  2. (Japan)
  3. Neutron Optics Group, Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0494 (Japan)
  4. Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-0808 (Japan)
Publication Date:
OSTI Identifier:
22483240
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCURACY; CUTTING; FOCUSING; MIRRORS; NEUTRON DIFFRACTION; NEUTRONS; NICKEL PHOSPHIDES; POLISHING; ROUGHNESS; SURFACES