Optimization of a superconducting adiabatic radio frequency neutron resonant spin flipper

Li, Fankang; Dadisman, Ryan; Wasilko, David C.

doi:10.1016/j.nima.2019.163300

Cited by 5 publications

(2 citation statements)

References 37 publications

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“…[40] The performance of the first prototype devices is already close to the transverse RF flippers, and recently RF coils were incorporated in these superconducting devices to further enhance the effective Larmor frequency and the phase stability. [62] Figure 2. The TAS-resolution ellipsoid (blue) cuts a small section (red) of the curved dispersion surface (green).…”

Section: The Nse Familymentioning

confidence: 99%

Neutron Spin‐Echo Instrumentation for Magnetic Scattering

Keller

Trepka

Habicht

et al. 2021

Physica Status Solidi (b)

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Neutron spin‐echo (NSE) spectroscopy is a powerful tool for the study of magnon lifetimes and magnetic critical dynamics. The unique property of NSE is the energy resolution in the μeV range. The first NSE spectrometers were optimized for quasielastic scattering at small momentum transfers and delivered substantial contributions to the understanding of critical dynamics in ferromagnets and dynamic correlations in spin glasses. The subsequent resonant NSE (NRSE) technique extends the parameter range toward large momentum and energy transfers and permits to measure magnon lifetimes across the Brillouin zone. NRSE also comprises the Larmor diffraction (LD) mode with a resolution for lattice spacings and their variance Δdhkl/dhkl of order 10−6. LD proves useful to determine magnetostriction effects, small lattice distortions related to magnetic ordering, mosaic spread in crystals, and the size distribution of antiferromagnetic domains. Both typical experiments and the related technical innovation are reviewed and an outlook on future developments is given.

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Section: The Nse Familymentioning

confidence: 99%

Neutron Spin‐Echo Instrumentation for Magnetic Scattering

Keller

Trepka

Habicht

et al. 2021

Physica Status Solidi (b)

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“…The RF flippers have a dimension similar to refs. [10,11] along the beam direction of 10 cm when not tilted. The detector has a 10 × 10 cm 2 active area, and for simplicity we assume an infinitesimally thin detector.…”

Section: Mcstas Model Of the Mieze Setupmentioning

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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Design and performance of a superconducting neutron resonance spin flipper

Dadisman

Wasilko

Kaiser

et al. 2020

Review of Scientific Instruments

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Despite the challenges, neutron resonance spin echo still holds the promise to improve upon neutron spin echo for the measurement of slow dynamics in materials. We present a bootstrap, radio frequency neutron spin flipper using high temperature superconducting technology capable of flipping neutron spin with either nonadiabatic or adiabatic modes. A frequency of 2 MHz has been achieved, which would achieve an effective field integral of 0.35 T m for a meter of separation in a neutron resonance spin echo spectrometer at the current device specifications. In bootstrap mode, the self-cancellation of Larmor phase aberrations can be achieved with the appropriate selection of the polarity of the gradient coils.

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Optimization of a superconducting adiabatic radio frequency neutron resonant spin flipper

Cited by 5 publications

References 37 publications

Neutron Spin‐Echo Instrumentation for Magnetic Scattering

Neutron Spin‐Echo Instrumentation for Magnetic Scattering

Large Angle MIEZE with Extended Fourier Time

Design and performance of a superconducting neutron resonance spin flipper

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