Development of Dynamic Nuclear Polarization System for Spin-Contrast-Variation Neutron Reflectometry

Kumada, Takayuki; Akutsu, Kazuhiro; Ohishi, Kazuki; Morikawa, Toshiaki; Kawamura, Yukihiko; Sahara, Masae; Suzuki, Jun–ichi; Torikai, Naoya

doi:10.7566/jpscp.22.011015

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…We are now developing a high-field closed-cycle cold helium DNP apparatus with a magnetic field of 6.3 T. Since JRR-3 does not have a liquid-helium supply and recovery facility, we cannot restart the SCV-SANS measurement at SANS-J due to the global helium shortage. To overcome this problem, we developed a closed-cycle DNP apparatus with a magnetic field of 3.4 T in 2018 (Kumada et al, 2018a;Kumada et al, 2018b), but the proton polarization obtained from this apparatus was not sufficient for the SCV-SANS measurements. In contrast, a large enhancement of proton polarization has been reported using a closed-cycle DNP apparatus at higher magnetic fields (Pierce et al, 2020;Kiswandhi et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Upgrade of the small-angle neutron scattering diffractometer SANS-J at JRR-3

Kumada,

Motokawa,

Oba

et al. 2023

J Appl Cryst

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The small-angle neutron scattering diffractometer SANS-J at the research reactor JRR-3, Tokai, Japan has been upgraded. A 3He front detector was installed adjacent to the direct beam just behind the sample position to cover scattering in the range 1.3–6 nm−1 for the magnitude of the scattering vector Q. Additionally, the maximum Q covered by the existing main 3He detector was extended to 1.8 nm−1 by decreasing the minimum sample-to-detector distance. These modifications enabled gapless measurements of the scattering curve in the Q range 0.002–6 nm−1 with three standard device layouts that can be changed within 10 min. A new graphical user interface simplifies the operation of the device layouts and data acquisition.

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Section: Discussionmentioning

confidence: 99%

Upgrade of the small-angle neutron scattering diffractometer SANS-J at JRR-3

Kumada,

Motokawa,

Oba

et al. 2023

J Appl Cryst

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“…Nuclear spin contrast variation has found numerous applications in structural studies on polymers and biomolecules [ 15 – 18 ] and more recently in reflectometry [ 19 – 21 ]. These experiments have in common High proton polarisation: P ≤ 0.8 at T = 0.1 K; P ≤ 0.4 at T = 1 K. Uniform nuclear polarisation throughout the sample volume.…”

Section: New Polarised Target Materials New Horizonsmentioning

confidence: 99%

Polarised neutron scattering from dynamic polarised nuclei 1972–2022

Stuhrmann

2023

Eur. Phys. J. E

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With the inauguration of the small-angle instrument D11 of the Institute Laue–Langevin (ILL) in September 1972 neutron scattering revolutionized methods of contrast variation. Very soon D11 was oversubscribed by proposals relying on isotopic substitution of hydrogen isotopes. At the same time in Oxford first experiments of polarised neutron diffraction from dynamic polarised protons in lanthanum magnesium nitrate crystals demonstrated the great utility of this approach. In the early eighties a new type of polarised target material led to a boom of contrast variation by nuclear polarisation. The new samples of frozen solutions of macromolecules lent themselves to small-angle scattering. Often in collaboration with research centres of High Energy Physics various groups in Europe and Japan started experiments of polarized neutron scattering from dynamic polarised protons. Techniques of NMR and EPR considerably enlarged the spectrum of nuclear contrast variation. This is shown with time-resolved polarised neutron scattering from dynamic polarized proton spins of a free radical and of tyrosyl doped catalase using D22 at the ILL. Graphical abstract

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“…broader application of the DNP technique. Pierce et al [9] developed a closed-cycle DNP system for neutron protein crystallography. We believe that our closed-cycle DNP system will make the SCV technique as a commonly usable technique for structure determination of composite materials.…”

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confidence: 99%