Polarisation modulated crosscorrelation neutron spectroscopy using 3He polarising filters on a pulsed source

A polarisation modulated crosscorrelation spectrometer using polarised 3He spin filters is outlined. Current developments in polarised 3He technology indicate that this spectrometer will be viable on the third generation pulsed neutron sources now being planned, providing a novel spectroscopic tool for magnetic studies. This paper focusses on discussing the optimisation of the performance of the 3He polarising filters.