Spin echo small angle neutron scattering experiment

Bouwman, Wim G.; Kraan, W.H.; Rekveldt, M.Th.

doi:10.1016/s0921-4526(99)00031-9

Cited by 20 publications

(13 citation statements)

References 2 publications

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“…2. Profile is a transition from along path (0) to along path (1). Given that the magnet poles are 180 mm wide in the y-direction, we suppose that ; the shift dx is…”

Section: Finding the Labeling Coefficientmentioning

confidence: 99%

“…The last 10 years have seen SESANS as an upcoming technique for investigation of the structure and space distribution of inhomogenieties in (soft) condensed matter, gel-like materials, etc, at a length scale from 100 nm-10 μm [1][2][3]. This technique gives answers in real space without the need of beam collimation, contrary to traditional SANS giving answers in reciprocal space, with the need of strong beam collimation.…”

Section: Introductionmentioning

confidence: 99%

“…The polarisation P(δ) is the maximum amplitude of this signal. Scan- 1 The article is published in the original. l is the sample thickness; k 0 = 2π/λ the neutron wavenumber.…”

Section: Introductionmentioning

confidence: 99%

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Algorithm of the Computer Modelling and a SESANS Setup with Adiabatic RF-Flippers

Kraan

Zabenkin

Axelrod

et al. 2017

J. Synch. Investig.

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Abstract⎯We made software to simulate Larmor precession in a setup for SESANS with adiabatic/RF flippers in magnets, existing at PNPI. The final polarisation of a divergent "ribbon beam" of height 2 cm is calculated as a function of λ. For λ = 6 Å, flippers 56 cm apart and RF frequency 1 MHz we find spin-echo length δ = 0.9 μm. We show numerically, how λ is converted to δ. Extension to δ = 20 μm is realistic.

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“…2. Profile is a transition from along path (0) to along path (1). Given that the magnet poles are 180 mm wide in the y-direction, we suppose that ; the shift dx is…”

Section: Finding the Labeling Coefficientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Algorithm of the Computer Modelling and a SESANS Setup with Adiabatic RF-Flippers

Kraan

Zabenkin

Axelrod

et al. 2017

J. Synch. Investig.

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“…More recently, Kraan et al (1997) demonstrated the application of Larmor precession in diffraction to study strains. Starting from the ideas of Golub & Ga È hler (1987) and Keller et al (1995) on the use of Larmor precession in small-angle neutron scattering (SANS), Rekveldt (1996 and Bouwman et al (1999) designed a SANS instrument, based on spin-echo, for measuring extremely large correlation lengths up to 1 mm. In addition, Rekveldt (1998, and Rekveldt et al (2001) showed that in parallel mode these Larmor devices can be used to design a high-resolution diffractometer that accurately determines lattice spacing and line pro®les without the need for the angular and wavelength con®nement necessary in conventional diffraction techniques.…”

Section: Introductionmentioning

confidence: 99%

High-resolution diffraction using Larmor precession of polarized neutrons

2002

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A new Larmor precession device, consisting of two separate precession modules, is introduced. It operates as a high-resolution neutron diffractometer, without the need for a highly collimated beam, necessary in conventional high-resolution neutron diffraction. The same instrument operates in different modes as an effective small-angle scattering device or accurately determines the line pro®le, the lattice plane orientation or the angular spread in crystal orientations. A dramatic intensity gain can be obtained in all applications discussed, compared with the conventional analogues, owing to the possibility to use a relaxed wavelength and angular resolution. Experiments in the high-resolution diffraction mode on Si and Al are discussed.

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“…Another method to obtain a relation between the scattering angle and the Larmor precession is by using magnetised foils (Bouwman et al, 1999;. We describe the new components for spin echo SANS (SESANS) and show a SESANS signal obtained with a preliminary set-up.…”

Section: Introductionmentioning

confidence: 99%

Development of spin-echo small-angle neutron scattering

Bouwman¹,

Oossanen²,

Uca³

et al. 2000

J Appl Cryst

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A polarised neutron spin echo technique is used to build a novel kind of small angle neutron scattering (SANS) instrument. The basis of this instrument is a symmetric set-up with a spin flipper in the centre, which creates a spin echo, even with a divergent beam. The precession regions on either side of the spin flipper are shaped such as to produce a very sensitive relation between the vertical angle of the neutron path and the total precession angle. Any SANS of a sample placed in the instrument reduces the symmetry of the neutron path and therefore decreases the echo. Magnetised foils define the precession regions by rotating the neutron spin from being parallel to the magnetic field to perpendicular to the field, to start the precession. These foils and the flipper were built and tested. A spin echo SANS signal is measured with the complete set-up . It should be possible with this technique to measure within minutes a full correlation function in samples over distances from 5 to 1000 nm.

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Spin echo small angle neutron scattering experiment

Cited by 20 publications

References 2 publications

Algorithm of the Computer Modelling and a SESANS Setup with Adiabatic RF-Flippers

Algorithm of the Computer Modelling and a SESANS Setup with Adiabatic RF-Flippers

High-resolution diffraction using Larmor precession of polarized neutrons

Development of spin-echo small-angle neutron scattering

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