Focusing of cold neutrons: Performance of a laterally graded and parabolically bent multilayer

M. Schneider; J. Stahn; P. Böni

doi:10.1016/j.nima.2009.08.047

Focusing of cold neutrons: Performance of a laterally graded and parabolically bent multilayer

M. Schneider, J. Stahn, P. Böni

Natural Sciences

Paul Scherrer Institut

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

8 Scopus citations

Abstract

We have designed and built a parabolically shaped reflector with a Ni/Ti-multilayer coating, graded along the length of the device. The bilayer thickness follows the varying angle of incidence to match the Bragg condition for a beam parallel to the axis of the parabola. As measurements show, this concept leads to a higher reflectivity for monochromatic neutrons compared to a conventional supermirror coating. With a reflectivity R > 96 % we measured a gain of 5 when focusing a 8.6 mm wide beam of 0 . 1^{{ring operator}} divergence down to 1.6 mm. The wavelength band was 4.7 Å ± 5 % and the focal point was 250 mm behind the device.

Original language	English
Pages (from-to)	530-533
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	610
Issue number	2
DOIs	https://doi.org/10.1016/j.nima.2009.08.047
State	Published - 1 Nov 2009

Keywords

Focusing
Graded multilayer
Neutron optics

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10.1016/j.nima.2009.08.047

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title = "Focusing of cold neutrons: Performance of a laterally graded and parabolically bent multilayer",

abstract = "We have designed and built a parabolically shaped reflector with a Ni/Ti-multilayer coating, graded along the length of the device. The bilayer thickness follows the varying angle of incidence to match the Bragg condition for a beam parallel to the axis of the parabola. As measurements show, this concept leads to a higher reflectivity for monochromatic neutrons compared to a conventional supermirror coating. With a reflectivity R > 96 % we measured a gain of 5 when focusing a 8.6 mm wide beam of 0 . 1{ring operator} divergence down to 1.6 mm. The wavelength band was 4.7 {\AA} ± 5 % and the focal point was 250 mm behind the device.",

keywords = "Focusing, Graded multilayer, Neutron optics",

author = "M. Schneider and J. Stahn and P. B{\"o}ni",

note = "Funding Information: The authors thank SwissNeutronics for machining the substrates and for the assembly of the test device. This work is based on experiments performed at the Swiss spallation neutron source SINQ, Paul Scherrer Institut, Villigen, Switzerland. Part of the work was supported by the Swiss National Science Foundation through the National Centre of Competence in Research MaNEP and by the Project 226507-NMI3 within the seventh framework program of the EU.",

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doi = "10.1016/j.nima.2009.08.047",

language = "English",

volume = "610",

pages = "530--533",

journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

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Focusing of cold neutrons: Performance of a laterally graded and parabolically bent multilayer. / Schneider, M.; Stahn, J.; Böni, P.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 610, No. 2, 01.11.2009, p. 530-533.

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

TY - JOUR

T1 - Focusing of cold neutrons

T2 - Performance of a laterally graded and parabolically bent multilayer

AU - Schneider, M.

AU - Stahn, J.

AU - Böni, P.

N1 - Funding Information: The authors thank SwissNeutronics for machining the substrates and for the assembly of the test device. This work is based on experiments performed at the Swiss spallation neutron source SINQ, Paul Scherrer Institut, Villigen, Switzerland. Part of the work was supported by the Swiss National Science Foundation through the National Centre of Competence in Research MaNEP and by the Project 226507-NMI3 within the seventh framework program of the EU.

PY - 2009/11/1

Y1 - 2009/11/1

N2 - We have designed and built a parabolically shaped reflector with a Ni/Ti-multilayer coating, graded along the length of the device. The bilayer thickness follows the varying angle of incidence to match the Bragg condition for a beam parallel to the axis of the parabola. As measurements show, this concept leads to a higher reflectivity for monochromatic neutrons compared to a conventional supermirror coating. With a reflectivity R > 96 % we measured a gain of 5 when focusing a 8.6 mm wide beam of 0 . 1{ring operator} divergence down to 1.6 mm. The wavelength band was 4.7 Å ± 5 % and the focal point was 250 mm behind the device.

AB - We have designed and built a parabolically shaped reflector with a Ni/Ti-multilayer coating, graded along the length of the device. The bilayer thickness follows the varying angle of incidence to match the Bragg condition for a beam parallel to the axis of the parabola. As measurements show, this concept leads to a higher reflectivity for monochromatic neutrons compared to a conventional supermirror coating. With a reflectivity R > 96 % we measured a gain of 5 when focusing a 8.6 mm wide beam of 0 . 1{ring operator} divergence down to 1.6 mm. The wavelength band was 4.7 Å ± 5 % and the focal point was 250 mm behind the device.

KW - Focusing

KW - Graded multilayer

KW - Neutron optics

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Focusing of cold neutrons: Performance of a laterally graded and parabolically bent multilayer

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