Last week we received some materials from ISIS so that we can start building the banana-shaped detector. We now have several possible design concepts of how to assemble the scintillators and fibers into 2mm pixels. Below you see the first tests on using foils to wrap the pixels together. Aluminium is transparent for neutrons, but it will reflect the scintillator light within one pixel. Like that the uptake of the light by the wavelength shifting fibers is more efficient.
Beside optical and neutron-optical properties, the dimension-accuracies and over-all rigidity of such a ‘foil frame’ when filled with fibers and scintillators should be sufficient to garantee the angular resolution and thus the performance of the diffractometer.