NDLI: EROS II: A boosted time-of-flight reflectometer for multi-purposes applications at the Laboratoire Léon Brillouin

Content Provider	Springer Nature Link
Author	Cousin, F. Ott, F. Gibert, F. Menelle, A.
Copyright Year	2011
Abstract	We present the characteristics and performances of the time-of-flight EROS reflectometer, located at Laboratoire Léon Brillouin (Saclay, France), which operates on the high-flux Orphée reactor. It is a versatile spectrometer with a horizontal geometry enabling air/liquid, air/solid and solid/liquid measurements. It is mostly dedicated to soft matter projects but welcomes also studies on thin solid films. It is equipped with a multi-disc chopper providing a tunable δλ/λ resolution, a collimation system with two deviating supermirrors and slits with flexible apertures allowing any given δθ/θ higher than 0.007, a large sample area, and a detector (either single tube or positioning sensitive detector). The accessible Q $_{min}$ is 0.0026 Å$^{−1}$ and the accessible Q $_{max}$ is 0.36 Å$^{−1}$ in air/solid or solid/liquid geometries and 0.21 Å$^{−1}$ in air/liquid geometry. The spectrometer has been upgraded during the last decade in order to reach a gain in flux of ∼ 50 from its original version. In air/solid geometry, we reach R $_{min}$ = 2×10$^{−5}$ in 1 hour, R $_{min}$ = 8×10$^{−7}$ in 4 hours and R $_{min}$ = 4×10$^{−7}$ in 12 hours on a sample of ∼ 20 cm$^{2}$ with EROS II, while it was difficult to go below 10$^{−5}$ with the initial version dating from 1992. In air/liquid or solid/liquid geometries, we show that the main limitation to reach very low reflectivities is the incoherent scattering of the liquid solvent (D$_{2}$O) . For such geometries, we obtain R $_{min}$ of 5×10$^{−6}$ in 4 hours after incoherent background subtraction. The rejuvenated EROS allows thus measurements of 15-20 samples of a few tens cm$^{2}$ in a span of 4 days, which corresponds to the minimum time allocated to external users for a given experiment.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
Journal	The European Physical Journal Plus
Volume Number	126
Issue Number	11
e-ISSN	21905444
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-11-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atomic, Molecular, Optical and Plasma Physics Applied and Technical Physics Condensed Matter Physics Statistical Physics, Dynamical Systems and Complexity Theoretical, Mathematical and Computational Physics
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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