The TOF-strain scanner POLDI with multiple frame overlap—concept and performance

The new neutron diffractometer POLDI for residual stress measurements at the continuous spallation source SINQ is in full operation since 2003. The instrument is a novel type of time-of-flight diffractometer with multiple frame overlap, a method, which allows tuning to high intensity and high resolution simultaneously. In this paper the concept and the most relevant components of the instrument are presented and an example for the performance is given.