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CRG - two-axis diffractometer D1B

The D1B-CRG is a high intensity powder diffractometer with an 128° PSD. It has always been in very high demand for real time experiments, and for very small samples because of its high efficiency position sensitive detector (PSD). Run as a CRG-A instrument by a CNRS / CSIC team, it is available 50% of the time for scheduled ILL experiments.

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Characteristics

More about D1B : Characteristics

General and Schematic view of D1B

D1B is a two-axis powder diffractometer dedicated to diffraction experiments needing a high neutron flux. It is located on the thermal guide H22. A great number of experiments performed on D1B concern the determination of magnetic structures. At small angles where the magnetic peaks are expected, a high spatial resolution can be achieved, the Full Width at Half Maximum (FWHM) reaches 0.2 deg. for sample with diameter of 8mm.

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D1B is equipped with 3He/CF4 position sensitive detector composed of a system of multi-electrodes with 1280 cells, which span a 2θ range of 128 deg..  The detector height is 100 mm and the sample to detector distance is 1500 mm.

Three pyrolitic graphite monochromators (002 reflection) focussing onto the sample position provide a flux of 6.5 x106 n cm2 s1 at 2.52 Å . A second wavelength of 1.28 Å is available by using a germanium monochromator (311 reflection). The flux at this 1.28 Å is 16 times less than at 2.52 Å. The beam size at sample position is 50x20 mm2


Resolution curve of D1B

Experimental Resolution curve of D1B obtained with Y-Garnet sample of 8mm diameter

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