Measurement and alleviation of subsurface damage in a thick-crystal neutron interferometer

Heacock, Benjamin; Haun, Robert; Hirota, Katsuya; Hosobata, Takuya; Huber, Michael G.; Jamer, Michelle E.; Kitaguchi, Masaaki; Pushin, Dmitry A.; Shimizu, Hirohiko; Taminiau, Ivar; Yamagata, Yutaka; Yamamoto, Tomoki; Young, Albert R.

doi:10.1107/s2053273319011604

Title: Measurement and alleviation of subsurface damage in a thick-crystal neutron interferometer

Journal Article · Mon Oct 07 00:00:00 EDT 2019 · Acta Crystallographica. Section A, Foundations and Advances (Online)

DOI:https://doi.org/10.1107/s2053273319011604· OSTI ID:1800945

Heacock, Benjamin; Haun, Robert; Hirota, Katsuya; Hosobata, Takuya; Huber, Michael G.; Jamer, Michelle E.; Kitaguchi, Masaaki; Pushin, Dmitry A.; Shimizu, Hirohiko; Taminiau, Ivar; Yamagata, Yutaka; Yamamoto, Tomoki; Young, Albert R.

The construction is described of a monolithic thick-crystal perfect silicon neutron interferometer using an ultra-high-precision grinding technique and a combination of annealing and chemical etching that differs from the construction of prior neutron interferometers. The interferometer is the second to have been annealed after machining and the first to be annealed prior to chemical etching. Monitoring the interference signal at each post-fabrication step provides a measurement of subsurface damage and its alleviation. In this case, the strain caused by subsurface damage manifests itself as a spatially varying angular misalignment between the two relevant volumes of the crystal and is reduced from ~10^-5 rad to ~10^-9 rad by way of annealing and chemical etching.

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Research Organization:: North Carolina State Univ., Raleigh, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-97ER41042

OSTI ID:: 1800945

Journal Information:: Acta Crystallographica. Section A, Foundations and Advances (Online), Vol. 75, Issue 6; ISSN 2053-2733

Publisher:: International Union of Crystallography

Country of Publication:: United States

Language:: English

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