Neutron Microbeam from a Planar Waveguide

Кожевников, С. В.; Жакетов, В. Д.; Radu, F.

doi:10.1134/s1063776118100163

Cited by 5 publications

(9 citation statements)

References 47 publications

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“…From the left side one can see the refracted beam and from the right side the part of the reflected beam is seen. Points are experimental data and bold line is the calculations using Fourier transformation (10). One can see that the calculations are satisfactory describe the experimental data.…”

Section: Experiments a Fixed Wavelength Modementioning

confidence: 78%

“…This corresponds to the angular resolution of the incident beam 0.009 and the angular resolution of PSD 0.028. The detailed description of the experiments can be found in [9,10]. 11b).…”

Section: B Time-of-flight Modementioning

confidence: 99%

“…At the time-of-flight reflectometer REMUR [8] a neutron microbeam was registered [9] and the dependence F   was measured experimentally. In [10] this dependence was obtained for a set of the waveguides with the different thickness d .…”

Section: Introductionmentioning

confidence: 99%

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Divergence of neutron microbeams from planar waveguides

Кожевников

Жакетов

Keller

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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Neutron planar waveguides are focusing devices generating a narrow neutron beam of submicron width. Such a neutron microbeam can be used for the investigation of local microstructures with high spatial resolution. The essential parameter of the microbeam is its angular width. The main contribution to the microbeam angular divergence is Fraunhofer diffraction on a narrow slit. We review and discuss various ways to characterize the angular divergence of the neutron microbeam using time-of-flight and fixed wavelength reflectometers.

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Section: Experiments a Fixed Wavelength Modementioning

confidence: 78%

Section: B Time-of-flight Modementioning

confidence: 99%

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Divergence of neutron microbeams from planar waveguides

Кожевников

Жакетов

Keller

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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“…The Fraunhofer diffraction contribution ~/ d  into the microbeam angular divergence was investigated experimentally. The dependence ~ was measured experimentally in [50,51] and ~1/ d in [51,52]. The intrinsic spectral width of the neutron resonances in the microbeam was estimated experimentally [53].…”

Section: Introductionmentioning

confidence: 99%

Polarized neutron channeling in weakly magnetic films

Кожевников

Жакетов

Keller

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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We describe a new sensitive method for the investigation of weakly magnetic films placed inside a tri-layer planar waveguide. Polarized neutrons tunnel into the waveguide through the surface, channel along the layers and are emitted from the end face as a narrow and slightly divergent microbeam. Polarization analysis permits to detect very small magnetization in the order of a few 10 Gauss. The magnetic film containing the rare-earth element Tb was investigated using both fixed wavelength and time-of-flight polarized neutron reflectometers. The experimental results are presented and discussed.

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“…In [28] the system of neutron microbeams was registered using the time-of-flight neutron reflectometer and Fraunhofer diffraction contribution F   into the microbeam divergence was measured experimentally. Fraunhofer contribution F~1 / d  into the microbeam angular divergence was measured experimentally using the time-of-flight [29] and fixed wavelength [30] reflectometers. For the first time a polarized neutron microbeam from a waveguide was applied for the investigation of a microstructure in [31].…”

Section: Introductionmentioning

confidence: 99%