Development of Ni/Ti supermirrors with large-m and a curved surface

K. Ikeda, T. Adachi, T. Shinohara, T. Morishima, K. Hirota, Y. Takizawa, H. Sato, H. M. Shimizu, M. Hino, S. Tasaki, T. Oku, K. Soyama

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Nickel/titanium supermirrors with critical reflection angles θc of m=3-5 times the critical angle of total reflection of natural Ni θcNi were fabricated on silicon substrates 3 in. in diameter and 3 mm in thickness by a DC magnetron sputtering system using the facing targets technique, and the neutron reflectivity of the supermirrors was evaluated for cold neutrons of 8.8 Å in wavelength. The supermirrors with 532 layers and with 468 layers achieved a reflectivity of 84% and 53% at their θc of m=2.9 and 3.7, respectively, while supermirrors with more than 630 layers had reduced reflectivity at angles smaller than θc. This reduction resulted from the formation of a non-multilayered pillar structure due to the growth of interface roughness between layers. Using supermirrors with m not more than 3, we designed a paraboloidal focusing mirror and proposed a prototype to obtain approximately 5 times the utilizable neutrons at the focal point for cold neutrons of 8 Å.

Original languageEnglish
Pages (from-to)78-83
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume529
Issue number1-3 SPEC. ISS.
DOIs
Publication statusPublished - 2004 Aug 21

Keywords

  • Curved surface mirror
  • DC magnetron sputtering
  • Interface roughness
  • Neutron optics
  • Supermirrors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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