title: GINA--a polarized neutron reflectometer at the Budapest Neutron Centre.
abstract: The setup, capabilities, and operation parameters of the neutron reflectometer GINA, the recently installed "Grazing Incidence Neutron Apparatus" at the Budapest Neutron Centre, are introduced. GINA, a dance-floor-type, constant-energy, angle-dispersive reflectometer is equipped with a 2D position-sensitive detector to study specular and off-specular scattering. Wavelength options between 3.2 and 5.7 Å are available for unpolarized and polarized neutrons. Spin polarization and analysis are achieved by magnetized transmission supermirrors and radio-frequency adiabatic spin flippers. As a result of vertical focusing by a five-element pyrolytic graphite monochromator, the reflected intensity from a 20 × 20 mm(2) sample has been doubled. GINA is dedicated to studies of magnetic films and heterostructures, but unpolarized options for non-magnetic films, membranes, and other surfaces are also provided. Shortly after its startup, reflectivity values as low as 3 × 10(-5) have been measured by the instrument. The instrument capabilities are demonstrated by a non-polarized and a polarized reflectivity experiment on a Si wafer and on a magnetic film of [(62)Ni/(nat)Ni](5) isotope-periodic layer composition. The facility is now open for the international user community. Its further development is underway establishing new sample environment options and spin analysis of off-specularly scattered radiation as well as further decreasing the background.
authors: Wigner RCP, RMKI, H-1525 Budapest, P.O. Box 49, Hungary. bottyan.laszlo@wigner.mta.hu
authors: L
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authors: Bottyán
authors: D G
authors: DG
authors: Merkel
authors: B
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authors: Nagy
authors: J
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authors: Füzi
authors: Sz
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authors: Sajti
authors: L
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authors: Deák
authors: G
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authors: Endrőczi
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authors: AV
authors: Petrenko
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authors: J
authors: Major