The linear phase correction of modulation of intensity emerging from zero effort (MIEZE) with magnetic Wollaston prisms

Li, Fankang

doi:10.1107/s1600576721013157

Cited by 4 publications

(2 citation statements)

References 32 publications

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“…Magnetic Wollaston prisms have previously been suggested for this type of correction. 19 In this case, the optical axis of the second arm would be at an angle relative to the first arm and the correction magnets would still correct for variations around that angle.…”

Section: Discussionmentioning

confidence: 99%

Correcting aberrations of a transverse-field neutron resonance spin echo instrument

Kuhn

McKay

et al. 2023

Review of Scientific Instruments

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Neutron resonance spin echo (NRSE) technique has the potential to increase the Fourier time and energy resolution in neutron scattering by using radio frequency (rf) neutron spin-flippers. However, aberrations arising from variations in the neutron path length between the rf flippers reduce the polarization. Here, we develop and test a transverse static-field magnet, a series of which are placed between the rf flippers, to correct for these aberrations. The prototype correction magnet was both simulated in an NRSE beamline using McStas, a Monte Carlo neutron ray-tracing software package, and measured using neutrons. The results from the prototype demonstrate that this static-field design corrects for transverse-field NRSE aberrations.

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Section: Discussionmentioning

confidence: 99%

Correcting aberrations of a transverse-field neutron resonance spin echo instrument

Kuhn

McKay

et al. 2023

Review of Scientific Instruments

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“…Consequently, as discussed in ref. [15], the wave front of the time modulation at the sample position for a given scattering angle cannot be precisely shaped, which increases the aberrations at increasing beam divergence [15].…”

Section: Tilting the Rf Flippersmentioning

confidence: 99%

Large Angle MIEZE with Extended Fourier Time

Dadisman,

Ehlers,

2021

Preprint

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Modulation of Intensity Emerging from Zero Effort (MIEZE) is a neutron resonant spin echo technique which allows one to measure time correlation scattering functions in materials by implementing radio-frequency (RF) intensity modulation at the sample and detector. The technique avoids neutron spin manipulation between the sample and the detector, and thus could find applications in cases where the sample depolarizes the neutron beam. However, the finite sample size creates a variance in path length between the locations where scattering and detection happens, which limits the contrast in intensity modulation that one can detect, in particular towards long correlation times or large scattering angles. We propose a modification to the MIEZE setup that will enable one to extend those detection limits to longer times and larger angles. We use Monte Carlo simulations of a neutron scattering beam line to show that, by tilting the RF flippers in the primary spectrometer with respect to the beam direction, one can shape the wave front of the intensity modulation at the sample to compensate for the path variance from the sample and the detector. The simulation results indicate that this change enables one to operate a MIEZE instrument at much increased RF frequencies, thus improving the effective energy resolution of the technique. The simulations show that for an incident beam with maximum divergence of 0.33 • , the maximum Fourier time can be increased by a factor of 3.

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Modulation of intensity emerging from zero effort (MIEZE) with extended Fourier time at large scattering angle

Dadisman

Ehlers

2022

Review of Scientific Instruments

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Modulation of Intensity Emerging from Zero Effort (MIEZE) is a neutron resonant spin echo technique that allows one to measure time correlation scattering functions in materials by implementing radio-frequency (RF) intensity modulation at the sample and the detector. The technique avoids neutron spin manipulation between the sample and the detector and, thus, could find applications in cases where the sample depolarizes the neutron beam. However, the finite sample size creates a variance in the path length between the locations where scattering and detection happen, which limits the contrast in intensity modulation that one can detect, in particular, toward long correlation times or large scattering angles. We propose a modification to the MIEZE setup that will enable one to extend those detection limits to longer times and larger angles. We use Monte Carlo simulations of a neutron scattering beamline to show that by tilting the RF flippers in the primary spectrometer with respect to the beam direction, one can shape the wave front of the intensity modulation at the sample to compensate for the path variance from the sample and the detector. The simulation results indicate that this change enables one to operate a MIEZE instrument at much increased RF frequencies, thus improving the effective energy resolution of the technique. For the MIEZE instrument simulated, it shows that for an incident beam with the maximum divergence of 0.33°, the maximum Fourier time can be increased by a factor of 3.

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The linear phase correction of modulation of intensity emerging from zero effort (MIEZE) with magnetic Wollaston prisms

Cited by 4 publications

References 32 publications

Correcting aberrations of a transverse-field neutron resonance spin echo instrument

Correcting aberrations of a transverse-field neutron resonance spin echo instrument

Large Angle MIEZE with Extended Fourier Time

Modulation of intensity emerging from zero effort (MIEZE) with extended Fourier time at large scattering angle

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