抄録
An increasing number of neutron focusing mirrors are being adopted in neutron scattering experiments in order to provide high fluxes at sample positions, reduce measurement time and/or increase statistical reliability. To realize a small focusing spot and high beam intensity, mirrors with both high form accuracy and low surface roughness are required. To achieve this, a fine polishing method, in which the material is removed effectively without losing profile accuracy, is developed to reduce the surface roughness of the mirror. High form accuracy in the major-axis is obtained through corrective polishing, and low surface roughness is acquired under a low polishing load. As a result, an ellipsoidal neutron focusing mirror is successfully fabricated with high form accuracy of 0.5 μm peak-to-valley (PV) and low surface roughness of 0.2 nm root-mean-square (rms).
