Studies of voids in neutron-irradiated aluminium single crystals: II. Small-angle neutron scattering

Hendricks, R. W.; Schelten, J.; Schmatz, W.

doi:10.1080/14786437408207237

Cited by 75 publications

(40 citation statements)

References 8 publications

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“…The solid circle shows the measured value, derived from figure 4, for the lens configuration and the solid square for the pinhole configuration. Figure 6 shows scattering patterns from a single crystal of aluminium containing voids (denoted AL-7 and kindly provided by G. Wignall, Oak Ridge Naltional Laboratory, Hendricks et al, 1974) measured with the lens and pinhole configurations. The sizes of apertures, L 1 , L 2 , and the number of lenses were the same as used in the beam profile measurements shown in figure 4.…”

Section: Intensity Gain Of the Focusing Lens Collimationmentioning

confidence: 99%

Focusing cold neutrons with multiple biconcave lenses for small-angle neutron scattering

Choi¹,

Barker²,

Glinka³

et al. 2000

J Appl Crystallogr

151

110

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The focusing of a cold neutron beam by multiple biconcave lenses has recently been proposed as a practical means of extending the lower limit of Q in conventional, long flight-path small-angle neutron scattering (SANS) instruments. To test the feasibility of this approach, we have carried out extensive measurements on one of the 30 m SANS instruments at NIST of the focusing characteristics of a set of 28 biconcave MgF 2 lenses. The focused beam profile has been measured over several orders of magnitude using high resolution neutron auto-radiography. The focusing lens configuration outperforms the pinhole collimation at Q min lower than 0.004 Å -1 . At Q min = 0.001 Å -1 , the intensity gain of the lens configuration over the pinhole collimation is greater than one order of magnitude.

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Section: Intensity Gain Of the Focusing Lens Collimationmentioning

confidence: 99%

Focusing cold neutrons with multiple biconcave lenses for small-angle neutron scattering

Choi¹,

Barker²,

Glinka³

et al. 2000

J Appl Crystallogr

151

110

View full text Add to dashboard Cite

show abstract

“…octahedra (Hendricks, Schelten & Schmatz, 1974), interacting spheres (Dauger, Fumeron, Guillot & Roth, 1979), cubes , ellipsoids and plate-like shapes (Fratzl, Langmayr & Paris, 1993). The utilization of the numerical approach enables testing of a wider variety of models to fit a measured data set.…”

Section: Discussionmentioning

confidence: 99%

“…Glatter, 1982Glatter, , 1991Pedersen, 1994, and references therein), while only a few methods applicable for the treatment of 2D anisotropic data from pinhole systems exist (see, e.g., Hendricks, Schelten & Schmatz, 1974;Dauger, Fumeron, Guillot & Roth, 1979;Fratzl, Langmayr & Paris, 1993). Generally, in order to interpret anisotropic SANS measurements in detail, an appropriate model representing the microstructure of the studied material has to be chosen.…”

Section: Introductionmentioning

confidence: 99%

Fully Numerical Procedure for Anisotropic Small-Angle Neutron Scattering Modelling and Data Evaluation

Strunz¹,

Wiedenmann²

1997

J Appl Cryst

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A numerical approach to the evaluation of small-angle neutron scattering (SANS) data is proposed. The procedure covers interparticle-interference and multiplescattering effects. The influence of these effects as well as the resolution of a SANS instrument are discussed. As an example of the use of the procedure for SANS data modelling, two-dimensional scattering curves of cuboidal particles and ordered cubes are presented. Finally, a test of the fitting procedure is performed on measured data for a solution of polystyrene spheres in water.

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“…Small-angle X-ray and neutron scattering have been demonstrated to be powerful tools for the evaluation of the size distribution and total volume fraction (swelling) of voids created by neutron irradiation (Kissinger, 1968;Kulcinski, Mastel & Kissinger, 1971;Epperson, Hendricks & Farrell, 1974;Hendricks, Schelten & Schmatz, 1974;Schelten & Hendricks, 1975;Hendricks, Schelten & Lippmann, 1978). As a part of our program to correlate the swelling induced by neutron and heavy-ion damage, we are determining void properties in neutron-irradiated nickel as a function of irradiation temperature and fluence.…”

Section: Applicationsmentioning

confidence: 99%

The ORNL 10-meter small angle X-ray scattering camera

Hendricks¹

1978

J Appl Crystallogr

Self Cite

175

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A new small-angle X-ray scattering camera which utilizes a rotating-anode X-ray source, crystal monochromatization of the incident beam, pinhole collimation, and a two-dimensional position-sensitive proportional counter has been developed. Because the sizes of the X-ray focal spot, the sample and the resolution element of the detector are each approximately 1 x 1 mm, the camera was designed so that the focal spot-to-sample and sample-to-detector distances may each be varied in 0-5 m increments up to 5 m to provide a system resolution in the range 0.5 to 4.0 mrad. A large, general-purpose specimen chamber has been provided into which a wide variety of special-purpose specimen holders can be mounted. The detector has an active area of 200 x 200 mm and has up to 200 x 200 resolution elements. The data are recorded in the memory of a minicomputer by a high-speed interface which uses a microprocessor to map the position of an incident photon into an absolute minicomputer memory address. With this interface, over 105 events s-1 can be recorded. The data recorded in the computer memory can be processed on-line by a variety of programs designed to enhance the user's interaction with the experiment. Among these are routines for background and detector-sensitivity correction, contour and perspective plotting of the two-dimensional data, a variety of averaging schemes for determining circular averages and/or one-dimensional slices of the data, file-management programs to handle the large quantity of data produced by a two-dimensional detector, and an interactive package for communications with a central computing facility via a dedicated hardwired link. At the highest angular resolution (0.4 mrad) the flux incident on the specimen is 1.0 x 106 photons s-1 with the X-ray source operating at 45 kV and 100 mA. The performance of the instrument is demonstrated with several examples, among which are scattering patterns from voids in neutron-irradiated nickel, plastically deformed polyethylene and collagen fibrils. Results from a kinetic study of the crystallization of polyethylene are also reported.

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Studies of voids in neutron-irradiated aluminium single crystals: II. Small-angle neutron scattering

Cited by 75 publications

References 8 publications

Focusing cold neutrons with multiple biconcave lenses for small-angle neutron scattering

Focusing cold neutrons with multiple biconcave lenses for small-angle neutron scattering

Fully Numerical Procedure for Anisotropic Small-Angle Neutron Scattering Modelling and Data Evaluation

The ORNL 10-meter small angle X-ray scattering camera

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