Author/Authors :
Stuhr، نويسنده , , U. and Spitzer، نويسنده , , Badi H. and Egger، نويسنده , , J. and Hofer، نويسنده , , A. and Rasmussen، نويسنده , , P. and Graf، نويسنده , , D. and Bollhalder، نويسنده , , A. Frederick Schild، نويسنده , , M. and Bauer، نويسنده , , G. and Wagner، نويسنده , , W.، نويسنده ,
Abstract :
POLDI (Pulse-OverLap DIffractometer) is a multiple pulse-overlap diffractometer at PSI, which is designed mainly for strain-scanning experiments. The multiple pulse-overlap method made it possible to build a time-of-flight diffractometer at a continuous neutron source with short flight path, high resolution and high intensity. The best achievable resolutions for the relative linewidths of the Bragg reflections are between 1×10−3 and 2×10−3, depending on the lattice spacing. The layout of the instrument and the features of the chopper, the neutron mirror and the 3He detector in time-focusing geometry are presented. The overall performance of the instrument is discussed with examples of strain-field measurements.
