A5032982259- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Advanced X-ray Imaging Techniques
- Magnetic properties of thin films
- Surface and Thin Film Phenomena
- Radiation Detection and Scintillator Technologies
- Copper Interconnects and Reliability
- Metal and Thin Film Mechanics
- X-ray Spectroscopy and Fluorescence Analysis
- Theoretical and Computational Physics
- Crystallography and Radiation Phenomena
- Magnetic Properties and Applications
- High-pressure geophysics and materials
- Semiconductor materials and interfaces
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Quantum, superfluid, helium dynamics
- Advancements in Photolithography Techniques
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Microstructure and mechanical properties
- Advanced Electron Microscopy Techniques and Applications
- Radiation Therapy and Dosimetry
- Nuclear materials and radiation effects
- nanoparticles nucleation surface interactions
Institut Laue-Langevin
2009-2023
Institut Langevin
2005-2012
European Synchrotron Radiation Facility
2002-2005
Aix-Marseille Université
2000-2004
Centre National de la Recherche Scientifique
1996-2002
European Science Foundation
2001
Centre d’Immunologie de Marseille-Luminy
1996
Due to the very limited availability of 3He, new kinds neutron detectors, not based on are urgently needed. Here, we present a method produce thin films 10B4C, with maximized detection efficiency, intended be part generation large area detectors. B4C have been deposited onto Al-blade and Si wafer substrates by dc magnetron sputtering from natB4C 10B4C targets in an Ar discharge, using industrial deposition system. The were characterized scanning electron microscopy, elastic recoil analysis,...
10B films have been studied as neutron convertors in semi-conductors [1], and different types of gas proportional counters for scattering applications: example [2] the detector is...
The present supply of 3He can no longer meet the detector demands upcoming ESS facility and continued upgrades at current neutron sources. Therefore viable alternative technologies are required to support development cutting-edge instrumentation for scattering science. In this context, 10B-based detectors being developed by collaboration between ESS, ILL, Linköping University. This paper reports on progress technology prospects applying it in modern experiments. is made-up multiple...
We have investigated the structure of buried interfaces in (111) Au:Ni multilayers. Conventional x-ray diffraction at constant energy as well anomalous scattering across Ni absorption K edge been used. Whereas fitting spectra a single leads to two different possible interfacial structures, diffracted intensity variation unambiguously favors model with an concentration gradient one interface. The multilayer presents intermixed region extending on six atomic planes around Ni/Au interface,...
The spatial and temporal evolution of the surface a tungsten film deposited by magnetron sputtering is investigated in situ real time an x-ray scattering technique. roughness described terms its power spectral density derived from measurements performed using synchrotron x-rays at energy $17.5\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$. data are analyzed frame first-order perturbation theory, which does not require any model growth correlation function. approach allows extracting quantitatively...
Kirkpatrick–Baez (KB) neutron supermirrors can efficiently focus polychromatic beams to micrometre dimensions. The ultimate size is determined mainly by the perfection of mirrors and beam needed have sufficient experimental signal. Nested or Montel KB collect ∼2.6 times more than standard sequential optics, but require good figure at edge one mirror. This paper describes characterization errors over important reflective portions two for a focusing pair. measurements are placed in context...
In this last of a series three papers on the development an advanced solid-state neutron polarizer, we present final construction polarizer and results its commissioning. The uses spin-selective reflection neutrons by interfaces coated with polarizing super-mirrors. is built entirely in-house for PF1B cold beam facility at Institut Max von Laue–Paul Langevin (ILL). It has been installed in casemate tested under real conditions. average transmission “good” spin component measured to be...
The roughening of sputter-deposited tungsten films is studied in situ and real time using grazing incidence x-ray scattering. It shown that the power spectral density functions characterizing external film surface roughness film-substrate conformity can be uniquely extracted from a single scattering diagram when measured at angle exceeding critical total reflection. temporal evolution spectrum demonstrated to obey universal scaling form leading exponent...
This paper discusses design principles and possible performances of an “in-beam” ultracold neutron (UCN) source for the European Spallation Source (ESS). The key components proposed delivery system are nested-mirror optics (NMO), which image bright emission surface large liquid-deuterium moderator, studied within HighNESS project, onto a remotely located superfluid-helium converter. Bandpass supermirrors, with optional polarization capability, enable selective transport those neutrons that...
We present an in-situ time-resolved synchrotron x-ray reflectivity (XRR) analysis of the thermal stability $\mathrm{Cu}∕\mathrm{Mg}∕\mathrm{Cu}$ trilayers during heating ramps up to $300\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ at $2\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}∕\mathrm{min}$. demonstrate that under some simplifying assumptions temporal evolution XRR scans can be used follow kinetics formation...
We have investigated the depolarization of neutrons in reflection on polarizing supermirrors, using opaque test bench. It consists two 3He cells with in-situ adiabatic fast passage flipping helium spin. In a beam initially polarized to AP = 99.98%, order 10−2 is evidenced after single supermirror. Depolarization could be reduced though not completely suppressed when working at high magnetizing fields (0.82 T). The preliminary data analysis also suggests correlation between m-value...
We present a status of recent projects involving the in-house production neutron multilayer optics, mainly polarizing supermirrors, at ILL. Our main "mass production" project is for wide-solid angle analyzing benders future instrument WASP (Wide Angle Spin Echo). The current this based on Co/Ti which spans several years, will be presented. Some parameters supermirrors cavity polarizers, Fe/Si and produced in past few years various ILL instruments, are also reported. supermirror samples order...
Polarized neutron off-specular and grazing-incidence small-angle scattering measurements are useful methods to investigate the in-plane structure its correlation of layered systems. Although these give information on complementary overlapping length scale, different characteristics between them need be taken into account when performed. In this study, difference in accessible scale structure, which is one most important characteristics, was discussed using an Fe/Si multilayer together with...
The in-plane magnetic structure of a layered system composed polycrystalline grains smaller than the ferromagnetic exchange length was studied to elucidate mechanism controlling properties considerably different from bulk using polarized neutron scattering under grazing incidence geometry. measured result, together with quantitative analysis based on distorted wave Born approximation, showed that area uniform orientation moments ranging 0.5–1.1 μ m not significantly varied during process...
Among polarizers based on the neutron reflection from Super-Mirrors (SMs), solid-state neutron-optical devices have many advantages. The most relevant is 5–10 times smaller size along beam direction compared to more traditional air-gap devices. An important condition for a good SM polarizer matching of substrate SLD (Scattering Length Density) with coating spin-down component. For Fe/Si Si substrate, this step positive when goes SM, which leads significant degradation performance in small Q...
Periodic multilayers deposited by Distributed Electron Cyclotron Resonance (DECR) sputtering were studied with synchrotron radiation at the ESRF bending magnet beam line BM5. In situ reflectivity measurements a photon energy of 20keV have been carried out on these samples during specific heat treatment. A dedicated furnace has developed to under vacuum from room temperature up 550°C. [Ru/B<sub>4</sub>C]<sub>70</sub> and [W/B<sub>4</sub>C]<sub>40</sub> repetition periods about 4nm chosen....
Alkali-borosilicate glasses constitute a current standard as structural elements for the manufacturing of neutron guides. Such optical devices are commonly installed in large research facilities to enable transport moderated neutrons from an intense source scientific instruments. However, this equipment is known suffer mechanical degradation arising irradiation due transport. This ageing may lead splinter processes once glass has reached its fluence limit. The radiation effects on some these...