Resolution of small-angle scattering with Soller collimation

Mildner, D. F. R.; Carpenter, J.M.

doi:10.1107/s0021889887086370

Cited by 23 publications

(27 citation statements)

References 7 publications

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“…In order to optimize neutron flux, the full width at half maximum full width at half maximum ͑FWHM͒ of is usually chosen to lie in the range between 10% and ϳ30% ͑⌬ / ͒, making it comparable to the angular resolution. 3 However, as mentioned, single crystal monochromators usually produce neutrons with a ⌬ / Ͻ1%, dramatically reducing the incident neutron flux. Although there are ways to increase ⌬ / , they usually involve a cost prohibitive redesign of the instrument.…”

Section: Introductionmentioning

confidence: 99%

Adapting a triple-axis spectrometer for small angle neutron scattering measurements

Nieh

Yamani

Kučerka

et al. 2008

Review of Scientific Instruments

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Small angle neutron scattering (SANS) instruments typically cover a q (scattering vector) range from 0.001 to 0.6 Å−1. This range in q is achieved through a combination of cold neutrons (λ>4 Å) and a highly collimated beam. However, as a direct result of the unavailability of a cold source at the Canadian Neutron Beam Centre (CNBC), we have resorted to adapting a triple-axis spectrometer to perform SANS measurements. This is achieved through the use of multiple converging incident beams which enhance the neutron flux on the sample by a factor of 20, compared to a single beam of the same spot size. Furthermore, smearing effects due to vertical divergence from the slit geometry are reduced through the use of horizontal Soller collimators. As a result, this modified triple-axis spectrometer enables SANS measurements to a minimum q value (qmin) of ∼0.006 Å−1. Data obtained from the modified triple-axis spectrometer are in good agreement with those data from the 30 m NG3-SANS instrument located at the National Institute of Standards and Technology (Gaithersburg, MD, USA).

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Section: Introductionmentioning

confidence: 99%

Adapting a triple-axis spectrometer for small angle neutron scattering measurements

Nieh

Yamani

Kučerka

et al. 2008

Review of Scientific Instruments

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“…In the present work, the angular resolution AO and the wavelength spread A,t are assumed to contribute independently to the resolution AQ, as is usually considered; see for example Mildner & Carpenter (1987) and Schmatz, Springer, Schelten & Ibel (1974). This is because, provided that there is no correlation between angle and wavelength in the beam incident on the collimator, the wavelength contribution AA to the experimental resolution AQ may be added later in quadrature to the geometric resolution AO (Windsor, 1981).…”

Section: Presentation Of the Problem Of Sansi Optimizationmentioning

confidence: 99%

Solving the problem of SANS instrument optimization

Margaça¹,

Falcão²,

Salgado³

et al. 1991

J Appl Cryst

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The problem of the optimization of small-angle neutron scattering instruments installed at steady neutron sources is discussed. The optimum solution is shown to be that in which full use is made of either the available luminous area of the source or the available hall space and not necessarily that corresponding to the equal-flight-paths design. Design criteria and their taking into account ment's layout. It is currently operating tially improved by cedure proposed by implementation are discussed space constraints on the instrushown that the performance of SANS facilities can be substanfollowing the optimization prothe authors.

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“…Therefore, the use of HSCs is sometimes needed. The resolution function V q for the slit scattering geometry was derived by Mildner and Carpenter [6,7]. Figure 3 shows a comparison of the calculated V q for the N5-SANS and a pinhole geometry instrument (i.e., the NG3-SANS located at the NIST Center for Neutron Research) [8].…”

Section: The Resolution Functionmentioning

confidence: 99%

Adapting a triple-axis spectrometer for small angle neutron scattering measurements

Nieh¹,

Yamani²,

Kučerka³

et al. 2010

J. Phys.: Conf. Ser.

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Abstract. Small angle neutron scattering (SANS) instruments typically require a cold source and a large spread of wavelengths in order to enhance incident flux. However, as a direct result of the unavailability of a cold source at the Canadian Neutron Beam Centre (CNBC), we have resorted to adapting a triple-axis spectrometer for SANS measurements. This is achieved through the use of multiple converging incident beams which enhance the neutron flux on the sample by a factor of 20, compared to a single beam of same spot size. Furthermore, smearing effects due to vertical divergence from the slit geometry are reduced through the use of horizontal Soller collimators. As a result, this modified triple-axis spectrometer enables SANS measurements to a minimum q value (q min ) of 0.006 Å í1 [1]. Data obtained from the modified triple-axis spectrometer are in good agreement with those data from the 30 m NG3-SANS instrument located at the National Institute of Standards and Technology (Gaithersburg, MD, USA).

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Resolution of small-angle scattering with Soller collimation

Cited by 23 publications

References 7 publications

Adapting a triple-axis spectrometer for small angle neutron scattering measurements

Adapting a triple-axis spectrometer for small angle neutron scattering measurements

Solving the problem of SANS instrument optimization

Adapting a triple-axis spectrometer for small angle neutron scattering measurements

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