الفهرس 
THE NEUTRON GUIDE FACILITY AT THE ET-RR-1 REACTOROnly 14 pages are availabe for public view
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Abstract
The present work deals with the calculations and
experimental measurements carried out for the neutron guide.
system
recently installed at one of the ET-RR-1 reactor horizontal channels. It is attached to the
Cairo Fourier Diffractometer Facility (CFDF) and consists of a main Curved Neutron Guide
Tube(CNGT), to deliver thermal neutrons, free from fast neutrons and y-rays
background, to a Fourier chopper, and a Straight Neutron Guide Tube (SNGT); mainly for
collimation of the neutron beam, after the chopper, to the sample under investigation.The
results of neutron reflectivity and spectrum calculations carried out for Cu, AI, natural Ni and
58Ni were found to be in favour of 58Ni as the best coating for the neutron guide mirror
channel walls. The experimental measurements were performed for the neutron
reflectivity, ofthe neutron guide sample mirror; integral neutron flux at different points of the
NG system and the neutron spectrum at the sample position. It was found, both from
measurements and calculations, that the neutron spectrum emitted from the NG system covers
the neutron wavelength range from 1 - 4 A ; with a maximum at 1.4 A. The
latter value is consistent with the value 1.377 A calculated for the
curved neutron guide characteristic wavelength.