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Neutron reflectometer and neutron imaging instrument

D50 comprises two experimental stations with dedicated setups for neutron reflectometry, neutron irradiation and neutron imaging.

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Instruments & Support : Instruments & groups > D50 > Description

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D50 is located at the end of the H521 guide shared with D16 and SuperADAM. It comprises two experimental stations with dedicated setups for neutron reflectometry, neutron irradiation and neutron imaging. In the first station there is a neutron reflectometer with horizontal scattering geometry (vertical surfaces) using the Refractive Analysis of the Incoming Neutron Beam Over the White Spectrum (RAINBOWS) technique. In the second station there are two complementary imaging setups: neutron and X-rays. In both stations, neutron irradiation of electronic components can be performed with different flux and maximum irradiation area.

Applications

•    The study of surfaces and buried interfaces of thin solid films and multilayers.
•    Characterization of super-mirrors for neutron guides.
•    2D and 3D neutron imaging with a field of view of up to 170x170 mm2, and real pixel resolution of 10 microns.
•    Complementary 2D and 3D X-ray imaging with a field of view of 250x300 mm2, and real pixel resolution of 5 microns.
•    Neutron irradiation for Single Event Effects (SEE) on electronic components.



    Instrument layout

    D50 operates in two modes:

    Reflectory mode - This mode uses a white neutron beam (wavelengths between 2 Å and 20 Å.) collimated over a length of 5 m. The sample is located just after the second adjustable slit. A prism refracts the neutron beam that travels along a 3-m flight tube until the high-resolution 2D detector. The prism, the flight tube and the detector are mounted onto a granite table that rotates following the sample rotation.

     

    Imaging mode - In this mode, the white neutron beam (wavelengths between 2 Å and 20 Å.) passes through a pinhole that acts as a primary source. The diverging beam travels a distance of 10 m inside two sections of tubes under vacuum (one in the collimation section, and one in the Reflectometry experimental station) and arrives to the Imaging station. The sample is placed on a rotation table at the end of the second flight tube. Behind the sample, a neutron detector allows to take an image of the sample in transmission. Several images are acquired at different angles, which allows for reconstructing, using the Fourier Slice Theorem, the three dimensional absorption maps of the object. Perpendicular to the neutron beam, an ensemble X-ray generator / detector allows to take a complementary X-ray image of the same sample. Further info on the imaging setup: https://next-grenoble.fr/