  In this article we report on the design, manufacture and testing of a
high-pressure cell for doing simultaneous dielectric and neutron spectroscopy.
This cell is a unique tool for studying dynamics on different timescales, from
kilo- to picoseconds, covering universal features such as the alpha relaxation
and fast vibrations at the same time. The cell, constructed in cylindrical
geometry, is made in high-strength aluminum alloy and operates up to 500 MPa in
a temperature range between roughly 2 and 320 K. In order to measure the
scattered neutron intensity and the sample capacitance simultaneously, a
cylindrical capacitor is positioned within the bore of the high-pressure
container. The capacitor consists of two concentric electrodes separated by
insulating spacers. The performance of this setup has been successfully
verified by collecting simultaneous dielectric and neutron spectroscopy data on
dipropylene glycol, using both backscattering and time-of-flight instruments.
We have carried out the experiments at different combinations of temperature
and pressure in both supercooled liquid and glassy state.
