A cryogenic high pressure cell for inelastic neutron scattering measurements of quantum fluids and solids

We present our new development of a high pressure cell for inelastic neutron scattering measurements of helium at ultra-low temperatures. The cell has a large sample volume of similar to 140 cm(3) and a working pressure of similar to 7MPa, with a relatively thin wall-thickness (1.1 mm)-thanks to the high yield strength aluminum used in the design. Two variants of this cell have been developed. The first cell is permanently joined components using electron-beam welding and explosion welding, methods that have little or no impact on the global heat treatment of the cell. The second cell discussed has modular and interchangeable components, which includes a capacitance pressure gauge, that can be sealed using the traditional indium wire technique. The performance of the cells have been tested in recent measurements on superfluid liquid helium near the solidification line. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4772764]