Horizontal ToF-neutron reflectometer REFSANS at FRM-II Munich/Germany: First tests and status

Kampmann, R.; Haese, Martin; Kudryashov, V. A.; Nickel, Bert; Daniel, C.; Fenzl, W.; Schreyer, A.; Sackmann, E.; Rädler, Joachim O.

doi:10.1016/j.physb.2006.05.399

Cited by 52 publications

(47 citation statements)

References 4 publications

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“…A heavy load goniometer (up to 200 kg) allows for the manipulation of the heavy and complexly shaped test detector. 54,55 The neutron quantum efficiency measurements were carried out for nat. B 4 C and 10 B 4 C converter coatings with thicknesses of about 1 lm, deposited on Al plates.…”

Section: Experimental: Sample Preparation and Characterizationmentioning

confidence: 99%

“…Using a scattering geometry with 55 incidence angle of the He 2þ ions, the RBS-edges of 12 C, 11 B, and 10 B can be resolved better for a quantitative determination of their relative amounts. In non-normal incidence, the travel path of the He 2þ -ions within the B 4 C layer, and thus the scattering probability of the He 2þ -ion on 10 B, 11 B, and 12 C, is increased (same principle as for increasing the neutron efficiency of a converter layer).…”

Section: B Depth Profile Investigations Of Boron Carbide Coatingsmentioning

confidence: 99%

“…The H concentration was determined by means NRA of the H( The relative quantum efficiency of 10 B 4 C coatings was evaluated by measurements at the ToF-reflectometer REFSANS. 54,55 For the test detector, an Al window of 6 mm thickness was chosen. At this thickness, the window can withstand many cycles of pressure changes during the opening and closing the detector housing for exchanging the converter samples.…”

Section: B Depth Profile Investigations Of Boron Carbide Coatingsmentioning

confidence: 99%

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Boron carbide coatings for neutron detection probed by x-rays, ions, and neutrons to determine thin film quality

Nowak

Störmer

Becker

et al. 2015

Journal of Applied Physics

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Boron carbide coatings for neutron detection probed by x-rays, ions, and neutrons to determine thin film quality He and the associated tremendous increase of its price, the supply of large neutron detection systems with 3 He becomes unaffordable. Alternative neutron detection concepts, therefore, have been invented based on solid 10 B converters. These concepts require development in thin film deposition technique regarding high adhesion, thickness uniformity and chemical purity of the converter coating on large area substrates. We report on the sputter deposition of highly uniform large-area 10 B 4 C coatings of up to 2 lm thickness with a thickness deviation below 4% using the Helmholtz-Zentrum Geesthacht large area sputtering system. The 10 B 4 C coatings are x-ray amorphous and highly adhesive to the substrate. Material analysis by means of X-ray-Photoelectron Spectroscopy, Secondary-Ion-Mass-Spectrometry, and RutherfordBack-Scattering (RBS) revealed low impurities concentration in the coatings. The isotope composition determined by Secondary-Ion-Mass-Spectrometry, RBS, and inelastic nuclear reaction analysis of the converter coatings evidences almost identical 10 B isotope contents in the sputter target and in the deposited coating. Neutron conversion and detection test measurements with variable irradiation geometry of the converter coating demonstrate an average relative quantum efficiency ranging from 65% to 90% for cold neutrons as compared to a black 3 He-monitor. Thus, these converter coatings contribute to the development of 3 He-free prototype detectors based on neutron grazing incidence. Transferring the developed coating process to an industrial scale sputtering system can make alternative 3 He-free converter elements available for large area neutron detection systems.

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Section: Experimental: Sample Preparation and Characterizationmentioning

confidence: 99%

Section: B Depth Profile Investigations Of Boron Carbide Coatingsmentioning

confidence: 99%

Section: B Depth Profile Investigations Of Boron Carbide Coatingsmentioning

confidence: 99%

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Boron carbide coatings for neutron detection probed by x-rays, ions, and neutrons to determine thin film quality

Nowak

Störmer

Becker

et al. 2015

Journal of Applied Physics

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“…A dedicated reflectometer REFSANS [44] to measure also in grazing incidence small angle neutron scattering (GISANS) and diffraction (GID) has been installed at FRM II. REFSANS combines features of a TOF reflectometer and a TOF SANS instrument, to allow in particular the investigation of planar membranes and monolayers at liquid interfaces to study later aggregation and ordering in fluid self-assembled systems.…”

Section: Biomembranes and Surface Interactionsmentioning

confidence: 99%

New sources and instrumentation for neutrons in biology

et al. 2008

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“…In order to improve data quality, some new methods were proposed. A smart strategy is taken at the REFSANS instrument at Heinz Maier-Leibnitz zentrum [26] . The data are acquired in list mode, all neutrons are saved with their time-of-flight, and wavelength conversion is performed later [27] .…”

Section: Introductionmentioning

confidence: 99%

Data reduction for time-of-flight small-angle neutron scattering with virtual neutrons

Tian

Zuo

et al. 2017

Instrumentation Science & Technology

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Abstract:Small-angle neutron scattering (SANS) is an experimental technique to detect material structures in the nanometer to micrometer range. The solution of the structural model constructed from SANS strongly depends on the accuracy of the reduced data. The time-offlight (TOF) SANS data are dependent on the wavelength of the pulsed neutron source.Therefore, data reduction must be handled very carefully to transform measured neutron events into neutron scattering intensity. In this study, reduction algorithms for TOF SANS data are developed and optimized using simulated data from a virtual neutron experiment. Each possible effect on the measured data is studied systematically, and suitable corrections are performed to obtain high-quality data. This work will facilitate scientific research and the instrument design at China Spallation Neutron Source.

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Horizontal ToF-neutron reflectometer REFSANS at FRM-II Munich/Germany: First tests and status

Cited by 52 publications

References 4 publications

Boron carbide coatings for neutron detection probed by x-rays, ions, and neutrons to determine thin film quality

Boron carbide coatings for neutron detection probed by x-rays, ions, and neutrons to determine thin film quality

New sources and instrumentation for neutrons in biology

Data reduction for time-of-flight small-angle neutron scattering with virtual neutrons

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