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Neutron technology at ILL

An example: the D22 polarizer

Polarizes neutron reflectivity of Fe/Si supermirror (9OO layers):

Measured in reflection geometry

 

 

600 μm thick silicon blade coated on both sides with m=4 supermirrors, placed in the collimating section with an incidence angle of 2°


Performance measurements on the instruments: C. Dewurst, S. Wood

 

 

=> at λ=10Å, 85% polarization and 44% transmission (of the unpolarized beam)

=> evaluation of the small-angle scattering contamination from the polarizer:

 

 

Parasitic peak (Imax/1000), at fixed position with λ (≠ off-specular scattering, origin ??).

But the polarizer will be placed before the collimating section.

 

Direct beam profile measured with the polarizer placed at the sample position:

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