The ion beam sputtering facility at KURRI: Coatings for advanced neutron optical devices

Hino, Masahiro; Oda, Takuya; Kitaguchi, Masaaki; Yamada, Norifumi L.; Tasaki, Seiji; Kawabata, Yuji

doi:10.1016/j.nima.2015.06.046

Cited by 39 publications

(23 citation statements)

References 23 publications

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“…We selected a VCN beam with a wavelength of λ ≃ 3. We used m = 4 polarizing Fe/SiGe super-mirrors coated on silicon wafers by an ion beam sputtering machine 18 as the polarizer and analyzer. The polarizing efficiency was higher than 90% for neutrons with a wavelength of 5.0 nm.…”

Section: Methodsmentioning

confidence: 99%

Pulsed neutron time-dependent intensity modulation for quasi-elastic neutron scattering spectroscopy

Oda

Hino

Kitaguchi

et al. 2016

Review of Scientific Instruments

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We propose a basic formula and demonstration for a high-resolution quasi-elastic neutron scattering (QENS) by combining the time-of-flight (TOF) method with Modulation of Intensity by Zero Effort (MIEZE) type neutron spin echo spectroscopy. The MIEZE technique has the potential to develop a unique approach to study on slow dynamics of condensed matter; however, the energy resolution is limited owing to the hypersensitivity of the MIEZE signal contrast to the echo condition, which is strongly affected by the alignment of the instruments and the sample. The narrow allowance of the optimal alignment is a major obstacle to the wide use of this technique. Combining the TOF method with MIEZE (TOF-MIEZE), the hypersensitivity of MIEZE signals is significantly alleviated with a short pulsed beam. This robustness is very useful to optimize experimental alignments and enables accurate measurements of QENS. The experimental results demonstrate the characteristic of the TOF-MIEZE technique and are well described by the formula presented in this study.

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Section: Methodsmentioning

confidence: 99%

Pulsed neutron time-dependent intensity modulation for quasi-elastic neutron scattering spectroscopy

Oda

Hino

Kitaguchi

et al. 2016

Review of Scientific Instruments

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“…1). The converter was fabricated using an ion beam sputter machine at KURRI [8] and the thicknesses of the layers were estimated based on the deposition rate. 10 B 4 C converts neutrons into two ions whereas the NiC layer stabilizes the 10 B 4 C layer.…”

Section: High Spatial Resolution Nuclear Emulsion Detectormentioning

confidence: 99%

A cold/ultracold neutron detector using fine-grained nuclear emulsion with spatial resolution less than 100 nm

et al. 2018

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A new type of cold/ultracold neutron detector that can realize a spatial resolution of less than 100 nm was developed using nuclear emulsion. The detector consists of a fine-grained nuclear emulsion coating and a 50-nm thick 10 B4C layer for the neutron conversion. The detector was exposed to cold and ultracold neutrons (UCNs) at the J-PARC. Detection efficiencies were measured as (0.16±0.02)% and (12±2)% for cold and ultracold neutrons consistently with the 10 B content in the converter. Positions of individual neutrons can be determined by observing secondary particle tracks recorded in the nuclear emulsion. The spatial resolution of incident neutrons were found to be in the range of 11-99 nm in the angle region of tanθ ≤ 1.9, where θ is the angle between a recorded track and the normal direction of the converter layer. The achieved spatial resolution corresponds to the improvement of one or two orders of magnitude compared with conventional techniques and it is comparable with the wavelength of UCNs.

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“…Details on this polishing process are given in [4,13,14]. The substrates with polished ellipsoidal surfaces are then coated with supermirrors at KURRI-IBS, whose details are found in [15].…”

Section: Diamond Cutting Of Ellipsoidal and Datum Surfacesmentioning

confidence: 99%

“…The plating is amorphous; thus, it provides surfaces with sub-nanometer roughness when polished, which is sufficiently smooth for supermirror deposition. The plating's compatibility with the supermirror coating was tested using the ion-beam sputtering facility at Kyoto University Research Reactor Institute (KURRI-IBS) [15], based on which we developed elliptic supermirrors for one-dimensional focusing [3,4].…”

Section: Introductionmentioning

confidence: 99%

Precision Mechanical Design of 900 mm Long Ellipsoidal Neutron-focusing Supermirror for VIN ROSE at J-PARC/MLF

Hosobata

Hino

Yoshinaga

et al. 2018

Proceedings of the International Conference on Neutron Optics (NOP2017)

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This paper describes a mechanical design concept for a large ellipsoidal neutron-focusing supermirror in a full figure of revolution, which is currently under development for its utilization in a neutron resonance spin echo spectrometer VIN ROSE at J-PARC/MLF. The mirror is an assembly of 54 segments, which is 900 mm long as a whole. Each segment is a supermirror deposited on a polished metallic substrate with an electroless nickel plating. As a base for precise assembly, a cagelike octadecagonal structure is introduced. The design exemplifies how free-form supermirrors can be designed with great freedom, when based on metallic substrates.

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The ion beam sputtering facility at KURRI: Coatings for advanced neutron optical devices

Cited by 39 publications

References 23 publications

Pulsed neutron time-dependent intensity modulation for quasi-elastic neutron scattering spectroscopy

Pulsed neutron time-dependent intensity modulation for quasi-elastic neutron scattering spectroscopy

A cold/ultracold neutron detector using fine-grained nuclear emulsion with spatial resolution less than 100 nm

Precision Mechanical Design of 900 mm Long Ellipsoidal Neutron-focusing Supermirror for VIN ROSE at J-PARC/MLF

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