Multilayer Neutron Optical Devices
Multilayer neutron mirrors represent those multilayer structures which have been produced in by far the largest quantity — over 100 m2 since 1977-Many multilayer devices have been used on various neutron spectrometers for several years. The oldest device in continuous use since 1978 is the neutron beam polarizer on the Neutron Spin Echo (NSE) spectrometer (IN11) at the Institut Laue-Langevin (ILL) in Grenoble. There are four vacuum deposition units in operation dedicated to multilayer neutron mirror production: two electron beam gun evaporators at ILL (about 1 m2/week production capacity each), another similar instrument at the Leningrad Institute of Nuclear Physics, and a diode sputtering apparatus at Brookhaven National Laboratory. A fifth machine (a triode sputtering unit with a capacity of 1 – 2 m2/week) is being installed at the Hahn-Meitner-Institute in Berlin. It is already apparent that the need for neutron mirrors amounts to some 200 m2 at least within the next 2 – 4 years.
KeywordsMultilayer Structure Total Reflection Critical Angle Neutron Beam Bragg Reflection
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