Multilayer devices
The Multilayer Devices
The multilayer group runs two magnetron sputtering machines for producing neutron supermirrors and other multilayers. These can be stacked together to form devices for focusing, collimating or polarising neutron beams.
One of the best-known devices is the "Schärpf-type" bender for polarising cold-neutron beams, but many other types of devices are possible, such as bandpass filters, converging/diverging guides and polarising cavities. Multilayer devices for ILL instruments are produced in-house.
The Multilayers Team
Thierry Bigault, Guillaume Delphin, Amandine Vittoz
Magnetic Supermirrors
Magnetic supermirrors: reflection, transmission and polarization
Scattering length density profile for 2 spin polarisation directions (up and down): N (b±p)
Some achievements
- Polarizing guide for ultra-cold neutron production => Cryo-EDM experiment
- Channel analyzers for diffuse scattering spectrometry => D7 => 250m² coated with supermirrors!
- New S-shape solid-state bender for cold neutron 3-axis spectroscopy => IN14
- Reflection polarizer for spin-echo spectroscopy => IN15
- Transmission polarizer for SANS => D22
An example: the D22 polarizer
Polarizes neutron reflectivity of Fe/Si supermirror (9OO layers):
Measured in reflection geometry
