Novel SANS instrument using Neutron Spin Echo

Rekveldt, M.Th.

doi:10.1016/0168-583x(96)00213-3

Cited by 138 publications

(116 citation statements)

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“…From the decrease of the polarisation we conclude that the scattering is due to features larger than 200 nm. Unfortunately, it is too early to compare the measurements quantitatively with calculations (Rekveldt, 1996) due to the multiple scattering used to increase the signal.…”

Section: Sesans Of Limestone Powdermentioning

confidence: 99%

“…Keller et al (1995) showed that SANS can be detected with a zero-field spin echo technique using inclined coils. Rekveldt (1996) proposed a technique to measure SANS with normal Larmor precession using coils with inclined front and end faces. In a modified concept these coils are reduced to triangular shaped coils which make the set-up only sensitive to elastic scattering.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Sesans Of Limestone Powdermentioning

confidence: 99%

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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“…Incoherent scattering, large angle coherent scattering, or absorption can be taken into account by a suitable imaginary part of the refraction index. 5 The approximation is valid for thermal neutrons as used in spin echo small angle neutron scattering [18][19][20][21] ͑SESANS͒ or ultrasmall angle neutron scattering [22][23][24] as the refractive index is close to unity. Note that the deviation from unity of the refractive index is proportional to the square of the wavelength so it increases rapidly for increasing wavelength.…”

Section: Small Angle Scatteringmentioning

confidence: 99%

“…This is called SESANS. 18,20 The basis for this technique was first discussed by Mezei in 1972 ͑Ref. 27͒ and Pynn in 1978.…”

Section: A Introductionmentioning

confidence: 99%

“…27͒ and Pynn in 1978. 28 Keller et al 29 showed in 1995 that it could be used for small angle neutron scattering and Rekveldt 18 ͑in 1996͒ was the first to consider the mathematical background of the technique and introduced the SESANS correlation function, as will be discussed later. The principle of the coding part of a SESANS setup is shown in Fig.…”

Section: A Introductionmentioning

confidence: 99%

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Coherence approach to neutron polarization propagation in instruments

2008

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The propagation of the mutual coherence function is a well known method to describe the effects of neutron's propagation through scattering instruments. This method is extended with the description of the coherence matrix to account for neutron polarization effects and its propagation through an instrument. A propagation law for the coherence matrix and the condition under which it can be used is derived. A rigorous description of polarization analysis is given. The phase-object approximation to describe small angle neutron scattering is extended to incorporate scattering in magnetic materials. The developed theory is applied to spin echo small angle neutron scattering and the neutron depolarization technique.

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Small‐Angle Neutron Scattering at Reactor Sources

Mortensen

2011

Neutrons in Soft Matter

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Novel SANS instrument using Neutron Spin Echo

Cited by 138 publications

References 1 publication

Development of spin-echo small-angle neutron scattering

Development of spin-echo small-angle neutron scattering

Coherence approach to neutron polarization propagation in instruments

Small‐Angle Neutron Scattering at Reactor Sources

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