Use of advanced optics in a neutron liquids reflectometer

John F. Ankner

doi:10.1016/S0921-4526(99)01988-2

Use of advanced optics in a neutron liquids reflectometer

John F. Ankner

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

To access a broad Q range with a moderately polychromatic (Δλ≈4.5 angstroms) neutron beam, we have evaluated the use of a tapered neutron guide. The utility of this device lies not in its focusing power, but in its broad angular dispersion of the incident beam. This beam can then be sampled by slits at a number of angles to cover the required Q range. Preliminary modeling of a liquids reflectometer based on this concept indicates that, by using highly reflective incident optics (4γ_c^Ni supermirror coatings), one will be able to measure reflectivities of 10^-8 in about 2 h counting time at the Spallation Neutron Source, currently under construction at Oak Ridge National Laboratory.

Original language	English
Pages (from-to)	253-255
Number of pages	3
Journal	Physica B: Physics of Condensed Matter
Volume	283
Issue number	1-3
DOIs	https://doi.org/10.1016/S0921-4526(99)01988-2
State	Published - Jun 2000
Externally published	Yes

Funding

This manuscript was prepared by a contractor of the US Department of Energy under contract No. DE-AC05-960R22464.

Funders	Funder number
US Department of Energy

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10.1016/S0921-4526(99)01988-2

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AB - To access a broad Q range with a moderately polychromatic (Δλ≈4.5 angstroms) neutron beam, we have evaluated the use of a tapered neutron guide. The utility of this device lies not in its focusing power, but in its broad angular dispersion of the incident beam. This beam can then be sampled by slits at a number of angles to cover the required Q range. Preliminary modeling of a liquids reflectometer based on this concept indicates that, by using highly reflective incident optics (4γcNi supermirror coatings), one will be able to measure reflectivities of 10-8 in about 2 h counting time at the Spallation Neutron Source, currently under construction at Oak Ridge National Laboratory.

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JF - Physica B: Physics of Condensed Matter

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ER -

Use of advanced optics in a neutron liquids reflectometer

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