MS14: Optimisation for bispectral instrument

This milestone has been achieved. The Multi-Grid detector is aimed at meeting the requirement of large-area detectors, such as those of chopper spectrometers. Neutrons impinging on the detector pass through multiple layers of boron, where on each layer, the detection probability depends on the thickness of the layer and neutron wavelength. Software has been developed which enables to optimise the thicknesses of layers for any given distribution of wavelengths of the incoming neutrons. The optimization can be done for a fixed wavelength or arbitrary distribution. It is also possible to optimise the thickness of each individual layer as well as the total number of the layers. This is particularly important for achieving the best possible detection efficiency in bispectral instruments, where a very large range of neutron wavelength is expected. More information is available on request.