Tests of modulated intensity small angle scattering in time of flight mode

Brandl, Georg; Lal, Jyotsana; Carpenter, J.M.; Crow, Lowell; Robertson, Lee; Georgii, R.; Böni, P.; Bleuel, Markus

doi:10.1016/j.nima.2011.11.075

Cited by 15 publications

(11 citation statements)

References 13 publications

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“…Another purpose of this experiment was to compare our MI-SANS measurement on a pulsed source with measurements performed at a continuous source. The implementation of MI-SANS geometry has been proposed on a pulsed source (Bleuel et al, 2005(Bleuel et al, , 2006 and demonstrated using a reactor source with a chopper on a skyrmion system (Brandl et al, 2012). The RESEDA beamline at the FRM-II neutron source (at the MLZ, Munich, Germany) has performed many MI-SANS experiments at constant wavelength .…”

Section: Discussionmentioning

confidence: 99%

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

Kuhn¹,

Geerits²,

Plomp³

et al. 2021

J Appl Cryst

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The modulated intensity by zero effort small-angle neutron scattering (MI-SANS) technique is used to measure scattering with a high energy resolution on samples normally ill-suited for neutron resonance spin echo. The self-diffusion constant of water is measured over a q–t range of 0.01–0.2 Å−1 and 70–500 ps. In addition to demonstrating the methodology of using time-of-flight MI-SANS instruments to observe diffusion in liquids, the results support previous measurements on water performed with different methods. This polarized neutron technique simultaneously measures the intermediate scattering function for a wide range of time and length scales. Two radio frequency flippers were used in a spin-echo setup with a 100 kHz frequency difference in order to create a high-resolution time measurement. The results are compared with self-diffusion measurements made by other techniques and the general applicability of MI-SANS at a pulsed source is assessed.

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Section: Discussionmentioning

confidence: 99%

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

Kuhn¹,

Geerits²,

Plomp³

et al. 2021

J Appl Cryst

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“…The operation of a MIEZE-1 spectrometer using a pulsed neutron beam has already been tested recently [40] and the necessary adaption in the sweeping of the amplitude of the RFfields has already been developed. It is planned to base the data evaluation on the existing ILL code library for NSE instruments as used at the ILL and the FRM II.…”

Section: Mieze-1mentioning

confidence: 99%

RESPECT: Neutron resonance spin-echo spectrometer for extreme studies

Georgii

Kindervater

Pfleiderer

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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We propose the design of a REsonance SPin-echo spECtrometer for exTreme studies, RESPECT, that is ideally suited for the exploration of non-dispersive processes such as diffusion, crystallisation, slow dynamics, tunneling processes, crystal electric field excitations, and spin fluctuations. It is a variant of the conventional neutron spin-echo technique (NSE) by i) replacing the long precession coils by pairs of longitudinal neutron spin-echo coils combined with RF-spin flippers and ii) by stabilizing the neutron polarization with small longitudinal guide fields that can in addition be used as field subtraction coils thus allowing to adjust the field integrals over a range of 8 orders of magnitude. Therefore, the dynamic range of RESPECT can in principle be varied over 8 orders of magnitude in time, if neutrons with the required energy are made available. Similarly as for existing NSE-spectrometers, spin echo times of up to approximately 1 microsecond can be reached if the divergence and the correction elements are properly adjusted. Thanks to the optional use of neutron guides and the fact that the currents for the correction coils are much smaller than in standard NSE, intensity gains of at least one order of magnitude are expected , making the concept of RESPECT also competitive for operation at medium flux neutron sources. RESPECT can also be operated in a MIEZE configuration allowing the investigation of relaxation processes in depolarizing environments as they occur when magnetic fields are applied at the sample position, i.e. for the investigation of the dynamics of flux lines in superconductors, magnetic fluctuations in ferromagnetic materials, and samples containing hydrogen.

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“…The TOF-MIEZE technique has been tested as a means of efficiently measuring I(Q, τ) using pulsed neutron beams, with frequencies from a few kHz up to 50 kHz reported in the literature [16][17][18][19]. The method requires a resonance spin flipper (RSF) that works for pulsed white beams, which can be achieved using a time-modulated RF current [20].…”

Section: Introductionmentioning

confidence: 99%

Observation of 400-kHz TOF-MIEZE Signals

Oda

Hino

Endo

et al. 2018

Proceedings of the International Conference on Neutron Optics (NOP2017)

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Modulation of intensity with zero effort (MIEZE) is a technique for quasi-elastic neutron scattering spectroscopy based on the neutron resonance spin echo. We have observed spin echo signals using MIEZE in time-of-flight mode (TOF-MIEZE) with a frequency of 400 kHz. The contrasts of the TOF-MIEZE signal were 0.69 ± 0.02 and 0.64 ± 0.05 at neutron wavelengths of 0.43 nm and 0.86 nm, respectively. The energy resolution, as given by the Fourier time, was estimated as 5.1 ns for 400 kHz with a neutron wavelength of 1.2 nm and a sample-detector distance of 1.2 m. We present the technical aspects of a TOF-MIEZE instrument and the recent results obtained at J-PARC.

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Tests of modulated intensity small angle scattering in time of flight mode

Cited by 15 publications

References 13 publications

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

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

RESPECT: Neutron resonance spin-echo spectrometer for extreme studies

Observation of 400-kHz TOF-MIEZE Signals

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