Gregor Nowak

A design study of a 1-m2Multi-Wire-Proportional-Chamber Position-Sensitive-Neutron-Detector (MWPC-PSND)

Gregor Nowak, Irina Stefanescu, Andreas Beldowski, Jochen Fenske et autres

Neutron detection by MWPC based on10B4C coatings can surpass in performance the one utilising3He-gas in terms of position resolution and count rate capability at similar detection efficiency [13]. The use of m2-size foils coated by10B4C demands the development of a mechanical concept …

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The instrument suite of the European Spallation Source

Ken Holst Andersen, D. N. Argyriou, Andrew Jackson, Judith Elizabeth Houston et autres

An overview is provided of the 15 neutron beam instruments making up the initial instrument suite of the European Spallation Source (ESS), and being made available to the neutron user community. The ESS neutron source consists of a high-power accelerator and target …

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Neutron detectors for the ESS diffractometers

Irina Stefanescu, Mogens Christensen, Jochen Fenske, Richard John Hall-Wilton et autres

The ambitious instrument suite for the future European Spallation Source whose civil construction started recently in Lund, Sweden, demands a set of diverse and challenging requirements for the neutron detectors. For instance, the unprecedented high flux expected on the samples to be …

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Observation of Ultrathin Precursor Film Formation during Ge–Si Liquid-Phase Epitaxy from an Undersaturated Solution

Vedran Vonk, Diego Pontoni, Melissa Cremers, Anne M. Kerkenaar et autres

Our in situ X-ray study shows that a silicon substrate in contact with an undersaturated In(Ge) solution is wetted by an approximately 1 nm thin germanium film, which does not grow any thicker. The results can be understood by the use of …

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BEER - The Beamline for European Materials Engineering Research at the ESS

Jochen Fenske, Mustapha Rouijaa, Jan Šaroun, Reinhard Kampmann et autres

The Beamline for European Materials Engineering Research (BEER) will be built at the European Spallation Source (ESS). The diffractometer utilizes the high brilliance of the long-pulse neutron source and offers high instrument flexibility. It includes a novel chopper technique that extracts several …

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Boron carbide coatings for neutron detection probed by x-rays, ions, and neutrons to determine thin film quality

Gregor Nowak, M. Störmer, Harry Becker, C. Horstmann et autres

Due to the present shortage of 3He and the associated tremendous increase of its price, the supply of large neutron detection systems with 3He becomes unaffordable. Alternative neutron detection concepts, therefore, have been invented based on solid 10B converters. These concepts require …

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GEM-based thermal neutron beam monitors for spallation sources

G. Croci, G. Claps, Roberto Caniello, Carlo Cazzaniga et autres

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Temperature dependence of magnetic properties in weakly exchange coupled Fe/V superlattices

Martina Ahlberg, Evangelos Th. Papaioannou, Gregor Nowak, Bjørgvin Hjörvarsson

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Asymmetric superconducting spin valves based on the Fe/V layer system grown on MgO(100)

Gregor Nowak, K. Westerholt, H. Zabel

We studied asymmetric superconducting spin valves with the layer sequence V/Fe/V/Fe/CoO, grown on MgO(100). These thin film heterostructures exhibit a superconducting spin valve (SSV) effect, that is, a difference, Δ T s , between the superconducting transition temperatures T s with the …

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Separation of the diffuse contribution to the specular x-ray scattering of multilayer films

V. P. Romanov, S. V. Ul’yanov, V. M. Uzdin, Gregor Nowak et autres

X-ray reflectivity measurements from multilayer films contain information not only about the layer thickness and interface roughness but also about correlations of the interface roughness parallel and perpendicular to the interface. Due to the finite size of the receiving detector slit, it …

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Thin films of the Heusler alloys Cu2MnAl and Co2MnSi: recovery of ferromagnetism via solid-state crystallization from the x-ray amorphous state

Denise Erb, Gregor Nowak, K. Westerholt, H. Zabel

X-ray amorphous thin films of the Heusler alloys Cu2MnAl and Co2MnSi have been prepared by magnetron sputter deposition at room temperature. In the amorphous state the Cu2MnAl phase is non-ferromagnetic; Co2MnSi is weakly ferromagnetic with a ferromagnetic Curie temperature of 170 K. …

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Neutron scattering measurements of magnetic excitations in Gd/Y superlattices

Annette Grünwald, Andrew R. Wildes, Wolf-Dieter Schmidt, E. V. Tartakovskaya et autres

Neutron inelastic scattering has been used to measure the magnetic excitations as a function of applied magnetic field in an antiferromagnetically coupled Gd/Y superlattice. The excitations were measured along the c-axis, which is parallel to the normal of the interfaces and the …

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