Use of TOF analysis of pulsed, monochromatic neutrons to suppress incoherent scattering from 1H containing materials
Within the instrument development programme at the ESS, there is a new type of powder diffractometer that is based on pulsed, monochromatic beams, possible as a result of the high time-averaged brilliance of the ESS source. This opens up new experimental possibilities where the Time of flight (TOF) channel can be used to perform a range of energy dispersive measurements, such as simple multi-wavelength powder diffraction. However, it should also be possible to use the TOF channel to separate inelastic incoherent scattering from 1H containing materials and also provide some limited inelastic capabilities for the optimised powder diffractometer, through the use of a removable Fermi chopper on the secondary instrument upstream of the sample position. We have simulated this set-up in McStas and presented it to the Scientific and Technical Advisory Panel for diffraction at the ESS. They have requested experimental data to support the McStas simulation work and also investigate using polarised neutrons to provide enhanced information. The results from the experiment will be used to further optimise the instrument concept and update available McStas components.
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HENRY Paul; BERTELSEN Mads; DEEN Pascale Petronella and WILDES Andrew. (2015). Use of TOF analysis of pulsed, monochromatic neutrons to suppress incoherent scattering from 1H containing materials. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-10-24
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