Journal ArticleDOI
AMOR: the time-of-flight neutron reflectometer at SINQ/PSI
TLDR
The AMOR as mentioned in this paper was designed to perform reflectometry measurements in horizontal sample-plane geometry, which allows studying both solid-liquid and liquid-liquid interfaces using a pulsed cold neutron beam from the end position of the neutron guide.Abstract:
The apparatus for multioptional reflectometry (AMOR) at SINQ/PSI is a versatile reflectometer operational in the time-of-flight (TOF) mode (in a wavelength range of 0.15 nm < λ < 1.3 nm) as well as in the monochromatic (θ- 2θ) mode with both polarized and unpolarized neutrons. AMOR is designed to perform reflectometry measurements in horizontal sample-plane geometry which allows studying both solid-liquid and liquid-liquid interfaces. A pulsed cold neutron beam from the end position of the neutron guide is produced by a dual-chopper system (side-by-side) having two windows at 180‡ and rotatable with a maximum frequency of 200 Hz. In the TOF mode, the chopper frequency, width of the gating window and the chopper-detector distance can be selected independently providing a wide range of q-resolution (Δq/q = 1–10%). Remanent FeCoV/Ti:N supermirrors are used as polarizer/analyzer with a polarization efficiency of ∼97%. For the monochromatic wavelength mode, a Ni/Ti multilayer is used as a monochromator, giving ∼50% reflectivity at a wavelength of 0.47 nm. In the present work, a detailed description of the instrument and setting-up of the polarization option is described. Results from some of the recent studies with polarized neutrons and measurements on liquid surfaces are presented.read more
Citations
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Journal ArticleDOI
Focusing neutron reflectometry: Implementation and experience on the TOF-reflectometer Amor
Jochen Stahn,Artur Glavic +1 more
TL;DR: In this article, the authors report on the application and performance of a down-scaled demonstrator of such a Selene guide, installed as an add-on on the TOF reflectometer Amor at the PSI.
Journal ArticleDOI
Focusing specular neutron reflectometry for small samples
TL;DR: In this paper, the authors presented a new concept which is based on state-of-the-art neutron optical elements and which allows studies of samples 100 times smaller than with previous instrumentation.
Journal ArticleDOI
Nanocrystallization and amorphization induced by reactive nitrogen sputtering in iron and permalloy
Rachana Gupta,Mukul Gupta +1 more
TL;DR: In this article, a mechanism inducing nanocrystallization and amorphization in Fe and NiFe due to reactive nitrogen sputtering is discussed, and the surface, structural, and magnetic properties of the deposited films were studied using x-ray reflection and diffraction, transmission electron microscopy, polarized neutron reflectivity, and using a dc extraction magnetometer.
Journal ArticleDOI
Complexation of phospholipids and cholesterol by triterpenic saponins in bulk and in monolayers.
TL;DR: The effect of the saponins on the model lipid monolayers does not fully correlate with the lipid-saponin complex formation in the homogeneous solution, and the lack of interaction of ammonium glycyrrhizate with both lipids is evident equally in bulk and monolayer experiments.
Journal ArticleDOI
Structural characterization of diamond-like carbon films for ultracold neutron applications
F. Atchison,T. Bryś,T. Bryś,M. Daum,P. Fierlinger,P. Fierlinger,A. Foelske,Mukul Gupta,Reinhold Henneck,S. Heule,S. Heule,Malgorzata Kasprzak,Malgorzata Kasprzak,Klaus Kirch,Rüdiger Kötz,M. Kuźniak,Thomas Lippert,C.-F. Meyer,F. Nolting,A. Pichlmaier,Dieter Schneider,Bernd Schultrich,P. Siemroth,U. Straumann +23 more
TL;DR: In this paper, hydrogen-free diamond-like carbon (DLC) films were produced by vacuum arc deposition for use as wall coating material in ultracold neutron (UCN) applications.
References
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Journal ArticleDOI
Noncollinear and collinear magnetic structures in exchange coupled Fe/Cr(001) superlattices
A. Schreyer,John F. Ankner,Th. Zeidler,Hartmut Zabel,M. Schäfer,J. A. Wolf,Peter Grünberg,Charles F. Majkrzak +7 more
TL;DR: It is demonstrated that the bilinear-biquadratic formalism used so far is inconsistent with the data, and the Cr specific proximity magnetism model is discussed which explains the occurrence of noncollinear coupling for systems with Cr interlayer thickness fluctuations.
Journal ArticleDOI
Applications of remanent supermirror polarizers
TL;DR: In this article, it is shown that using reactive sputtering, it is possible to adjust the index of refraction for neutrons, ni, of the individual layers of a remanent supermirror.
Journal ArticleDOI
AMOR – the versatile reflectometer at SINQ
TL;DR: In this paper, the authors report on a new facility for neutron reflectometry situated at the end position of a cold neutron guide at the Swiss Spallation Neutron Source SINQ.
Journal ArticleDOI
Conceptional design of a flexible neutron reflectometer at ‘SINQ’
TL;DR: In this paper, the authors describe the concept of a flexible reflectometer at SINQ/PSI and give a first presentation to the user community, which works in the white beam time-of-flight mode with a vertical scattering geometry.
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