Abstract:
During the last decade a new concept of high-resolution focusing configuration has been developed, using Q-space focusing effects. If such a focusing configuration is to be used for stress determinations, special problems arise.
A convenient solution is to limit the dimensions of the sample zone for which strain determinations are realised. That means not only the use of corresponding diaphragms but also getting real-space focusing at sample position.
In conclusion if strain determinations are to be realised using Q-space focusing configuration both real space focusing at sample position and the phase-space focusing getting thin diffraction peaks must be obtained. The corresponding focusing conditions are deduced in this paper for three neutron diffractometer configurations: crystal diffractometer, 2 crystals diffractometer and time-of-flight diffractoemeter using steady-state neutron source.
This work has been partially supported by IAEA Vienna under the contract ROM/13579.