ROTAX, a new type of time-of-flight crystal analyser spectrometer for
neutron inelastic scattering from single crystals is now installed at
ISIS. By utilising its non-uniformly rotating crystal analyser, ROTAX
provides a wide variety of time-of-flight scans through (Q, omega) spa
ce. A description of the instrument and its software is given as a pra
ctical guideline for the use of this novel instrument. Phonon scatteri
ng data obtained from a Cu single crystal are presented.