The basis of multichannel neutron polarizers is CoFeV/TiZr supermirrors
with the TiZrGd underlayer on the glass substrate of thickness 0.3 mm.
The supermirrors severed, on top and bottom, by steel spacers are
squeezed between the surfaces of the puncheon and the matrix, both
made of nonmagnetic materials. To avoid the direct view, the channels
formed by the supermirrors are bent into circumference. Such a device
polarizes neutrons with wavelengths ≥1.4 Å. The stack of the
supermirrors is fixed within a permanent magnet. The field magnitude
is 250-300 Oe. A polarizer with total dimensions 180x180x840 mm3
polarizes a neutron beam with a cross section 50x100 mm2.
The transmittance of the polarizer channels for
spin-up (+) neutrons as a function of the neutron
wavelength (measured in IRI Delft).
The polarizing efficiency of the polarizer as a function of the neutron
wavelength (measured in IRI Delft).
Users:
IRI, TU Delft, the Netherlands
Contact person: Dr. M.Th. Rekveldt
Phone: +31 152782107
E-mail: Rekveldt@IRI.TUDelft.NL
HMI, Berlin, Germany
Contact person: Dr. Konrad Siemensmeyer
Phone: +49 (30) 806 22757
E-mail: Siemensmeyer@hmi.de
ATI, Viena, Austria
Contact person: Prof. Dr. Gerald Badurek
Phone: + (43-1) 58 801 14129
E-mail: Badurek@ATI.ac.au
