Recent development of multilayer neutron mirror at KURRI

Abstract We have succeeded in fabricating m =4.8 Ni/Ti and m =5.1 NiC/Ti supermirrors with high reflectivity and small d -spacing multilayer monochromator using ion beam sputtering instrument installed at KURRI. Here the number of m is a measure of critical angle in unit of critical angle of nickel. The reflectivity is above 0.6 for the m =5.1 NiC/Ti supermirror in which number of layer is 3000. The reflectivity is 0.065 at Bragg condition for the Ni/Ti monochromator (d=2.68 nm ) in which number of layer is 10 000.