High-pressure cell for small- and medium-angle neutron scattering measurements up to 300 MPa

We describe a high-pressure cell designed for small- and medium-angle neutron scattering measurements on fluid samples under hydrostatic pressure up to 300 MPa. The cell is fitted up with two thick sapphire windows with a large forward optical aperture. For a neutron beam of 7 mm in diameter the maximum forward scattering angle is 15°. With a neutron wavelength of 0.41 nm this allows scattering spectra to be recorded for wave-number transfers up to 4 nm−1. The optical path length was 5 mm. However, it can be easily varied according to the sample under study.