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Neutron diffractometer; bent crystal monochromator; monochromatic focusing

In a conventional diffractometer having single monochromator, only one position, parallel position, is used for the diffraction experiment (i.e. detection) because the resolution property of the other one, anti-parallel position, is very poor. However, a bent perfect crystal (BPC) monochromator at monochromatic focusing condition can provide a quite flat and equal resolution property at both parallel and anti-parallel positions and thus one can have a chance to use both sides for the diffraction experiment. From the data of the FWHM and the Δd/d measured on three diffraction geometries (symmetric, asymmetric compression and asymmetric expansion), we can conclude that the simultaneous diffraction measurement in both parallel and anti-parallel positions can be achieved.

Yong Nam Choi¹ Shin Ae Kim¹ Sung Kyu Kim¹ Sung Baek Kim¹ Chang-Hee Lee¹ Pavel Mikula²

1. HANARO Center, Korea Atomic Energy Research Institute, Yuseong, Daejeon - 305-600, Korea
2. Nuclear Physics Institute, Rez - 25068, Czech Republic

Published

July 2004