Time-of-flight modulated intensity small-angle neutron scattering measurement of the self-diffusion constant of water

Kuhn, Stephen J.; Geerits, Niels; Plomp, J.; Dalgliesh, Robert M.; Parnell, Steven R.

doi:10.1107/s1600576721002612

Cited by 5 publications

(4 citation statements)

References 39 publications

(39 reference statements)

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“…[25,23,12,57,60,59] A MIEZE setup has been developed for the Larmor spectrometer at the ISIS neutron source. Benchmarking and first experiments on the dynamics of water have been performed [42,14]. A MIEZE setup at ORNL was recently commissioned.…”

Section: State Of the Artmentioning

confidence: 99%

Extending MIEZE spectroscopy towards thermal wavelengths

Jochum¹,

Keller²,

Pfleiderer³

2022

Preprint

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We propose a Modulation of intensity with zero effort (MIEZE) setup for high -resolution neutron spectroscopy at momentum transfers up to 3 Å−1 ,energy transfers up to 20 meV, and an energy resolution in the µeVrange using both thermal and cold neutrons. MIEZE has two prominent advantages compared to classical neutron spin -echo. The first one is the possibility to investigate spin -depolarizing samples or samples in strong magnetic fields without loss of signal amplitude and intensity. This allows for the study of spin fluctuations in ferromagnets, and facilitates the study of samples with strong spin -incoherent scattering. The second advantage is that multi -analyzer setups can be implemented with comparatively small effort. The use of thermal neutrons increases the range of validity of the spin -echo approximation towards shorter spin -echo times. In turn, the thermal MIEZE option for greater ranges (TIGER) closes the gap between classical neutron spin -echo spectroscopy and conventional highresolution neutron spectroscopy techniques such as triple -axis, time -offlight, and back -scattering. To illustrate the feasibility of TIGER we present the details of an implementation at the beamline RESEDA at FRM II by means of an additional velocity selector, polarizer and analyzer.

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Section: State Of the Artmentioning

confidence: 99%

Extending MIEZE spectroscopy towards thermal wavelengths

Jochum¹,

Keller²,

Pfleiderer³

2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…A MIEZE setup has been developed for the Larmor spectrometer at the ISIS neutron source. Benchmarking and first experiments on the dynamics of water have been performed (Kuhn et al, 2021a;Geerits et al, 2019). A MIEZE setup at ORNL was recently commissioned.…”

Section: State Of the Artmentioning

confidence: 99%

Extending MIEZE spectroscopy towards thermal wavelengths

Jochum¹,

Keller²,

Pfleiderer³

2022

J Appl Cryst

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A modulation of intensity with zero effort (MIEZE) setup is proposed for high-resolution neutron spectroscopy at momentum transfers up to 3 Å−1, energy transfers up to 20 meV and an energy resolution in the microelectronvolt range using both thermal and cold neutrons. MIEZE has two prominent advantages compared with classical neutron spin echo. The first is the possibility to investigate spin-depolarizing samples or samples in strong magnetic fields without loss of signal amplitude and intensity. This allows for the study of spin fluctuations in ferromagnets, and facilitates the study of samples with strong spin-incoherent scattering. The second advantage is that multi-analyzer setups can be implemented with comparatively little effort. The use of thermal neutrons increases the range of validity of the spin-echo approximation towards shorter spin-echo times. In turn, the thermal MIEZE option for greater ranges (TIGER) closes the gap between classical neutron spin-echo spectroscopy and conventional high-resolution neutron spectroscopy techniques such as triple-axis, time-of-flight and back-scattering. To illustrate the feasibility of TIGER, this paper presents the details of its implementation at the RESEDA beamline at FRM II by means of an additional velocity selector, polarizer and analyzer.

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“…For this essential reason, the MIEZE technique is especially compatible with SANS type measurements. This special compatibility has been known for over two decades and demonstrations [48][49][50] and experiments [51] have been carried out over the years under the MISANS (MI-SANS) designation.…”

Section: B the Mieze Techniquementioning

confidence: 99%

MIASANS at the longitudinal neutron resonant spin-echo spectrometer RESEDA

2022

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The RESEDA (Resonant Spin-Echo for Diverse Applications) instrument has been optimized for neutron scattering measurements of quasi-elastic and inelastic processes over a wide parameter range. One spectrometer arm of RESEDA is configured for the MIEZE (Modulation of Intensity with Zero Effort) technique, where the measured signal is an oscillation in neutron intensity over time prepared by two precisely tuned radio-frequency (RF) flippers. With MIEZE, all spin-manipulations are performed before the beam reaches the sample, and thus the signal from sample scattering is not disrupted by any depolarizing conditions there (i.e. magnetic materials and fields). The MIEZE spectrometer is being further optimized for the requirements of small angle neutron scattering (MIASANS), a versatile combination of the spatial and dynamical resolving power of both techniques. We present the current status of (i) the newly installed superconducting solenoids as part of the RF flippers to significantly extend the dynamic range (ii) the development and installation of a new detector on a translation stage within a new larger SANS-type vacuum vessel for flexibility with angular coverage and resolution, and (iii) the efforts to reduce background.

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Time-of-flight modulated intensity small-angle neutron scattering measurement of the self-diffusion constant of water

Cited by 5 publications

References 39 publications

Extending MIEZE spectroscopy towards thermal wavelengths

Extending MIEZE spectroscopy towards thermal wavelengths

Extending MIEZE spectroscopy towards thermal wavelengths

MIASANS at the longitudinal neutron resonant spin-echo spectrometer RESEDA

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