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The completely renewed and upgraded neutron reflectometer at the TU Delft Reactor Institute

Bannenberg, L.J. (author), Bresser, R. (author), van der Ende, P. (author), van Exter, M.A.J. (author), van Goozen, W.G.A. (author), Naastepad, F.T.C.J. (author), Thijs, M.A. (author), Verleg, M.N. (author), de Vroege, C.F. (author), Waaijer, C.J. (author), van Well, A.A. (author)

The horizontal time-of-flight neutron reflectometer at the reactor of the Delft University of Technology, The Netherlands, has been completely renewed, relocated, and upgraded and allows for the study of air/liquid, solid/liquid, and solid/air interfaces. Innovations in the redesign include (i) a completely flexible double disk chopper system...

journal article 2023

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Phase-transformation and precipitation kinetics in vanadium micro-alloyed steels by in-situ, simultaneous neutron diffraction and SANS

Ioannidou, C. (author), Navarro Lopez, A. (author), Dalgliesh, Robert M. (author), Rijkenberg, Arjan (author), Geerlofs, N. (author), Pappas, C. (author), Sietsma, J. (author), van Well, A.A. (author), Offerman, S.E. (author)

In-situ Neutron Diffraction and Small-Angle Neutron Scattering (SANS) are employed for the first time simultaneously in order to reveal the interaction between the austenite to ferrite phase transformation and the precipitation kinetics during isothermal annealing at 650 and at 700 °C in three steels with different vanadium (V) and carbon (C)...

journal article 2021

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Furnace for in situ and simultaneous studies of nano-precipitates and phase transformations in steels by SANS and neutron diffraction

Navarro Lopez, A. (author), Ioannidou, C. (author), van der Wal, E.M. (author), Arechabaleta Guenechea, Z. (author), van den Oever, R. (author), Verleg, M.N. (author), Dalgliesh, R. M. (author), Sykora, J. (author), Akeroyd, F. A. (author), Geerlofs, N. (author), Sietsma, J. (author), Pappas, C. (author), van Well, A.A. (author), Offerman, S.E. (author)

Interphase precipitation occurring during solid-state phase transformations in micro-alloyed steels is generally studied through transmission electron microscopy, atom probe tomography, and ex situ measurements of Small-Angle Neutron Scattering (SANS). The advantage of SANS over the other two characterization techniques is that SANS allows...

journal article 2020

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Unveiling contextual realities by microscopically entangling a neutron

Shen, J. (author), Kuhn, S. J. (author), Dalgliesh, Robert M. (author), de Haan, V. O. (author), Geerits, N. (author), Irfan, A. A.M. (author), Parnell, S.R. (author), Plomp, J. (author), van Well, A.A. (author)

The development of qualitatively new measurement capabilities is often a prerequisite for critical scientific and technological advances. Here we introduce an unconventional quantum probe, an entangled neutron beam, where individual neutrons can be entangled in spin, trajectory and energy. The spatial separation of trajectories from...

journal article 2020

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Analysis of SESANS data by numerical Hankel transform implementation in SasView

Bakker, J.H. (author), Washington, Adam L. (author), Parnell, S.R. (author), van Well, A.A. (author), Pappas, C. (author), Bouwman, W.G. (author)

SESANS data analysis has been implemented in the SasView software package, allowing SESANS experiments to be analyzed using a numerical Hankel transformation of isotropic small-angle scattering (SAS) models. The error of the numerical approximation is three orders of magnitude below typical experimental errors. All advanced data fitting...

journal article 2020

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Microstructure, precipitate and property evolution in cold-rolled Ti-V high strength low alloy steel

Zhang, Xukai (author), Ioannidou, C. (author), ten Brink, Gert H. (author), Navarro Lopez, A. (author), Wormann, Jan (author), Campaniello, Jean (author), Dalgliesh, Robert M. (author), van Well, A.A. (author), Offerman, S.E. (author), Kranendonk, Winfried (author), Kooi, Bart J. (author)

A cold-rolled Ti-V high strength low alloy (HSLA) steel was isothermally annealed at 650 °C and 700 °C for different times. A unique combination of techniques including visible light microscopy (VLM), transmission electron microscopy (TEM), matrix dissolution, small angle neutron scattering (SANS) and hardness measurement has been employed to...

journal article 2020

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Search for exotic spin-dependent couplings of the neutron with matter using spin-echo based neutron interferometry

Parnell, S.R. (author), van Well, A.A. (author), Plomp, J. (author), Dalgliesh, R. M. (author), Steinke, N. J. (author), Cooper, J. F.K. (author), Geerits, N. (author), Steffen, K. E. (author), Snow, W. M. (author)

Various theories beyond the Standard Model predict new particles with masses in the sub-eV range with very weak couplings to ordinary matter which can possess spin-dependent couplings to electrons and nucleons. We report null results of a search for possible exotic spin-dependent couplings of the neutron which could be induced by the exchange...

journal article 2020

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Evolution of the precipitate composition during annealing of vanadium micro-alloyed steels by in-situ SANS

Ioannidou, C. (author), Navarro Lopez, A. (author), Rijkenberg, Arjan (author), Dalgliesh, Robert M. (author), Koelling, Sebastian (author), Pappas, C. (author), Sietsma, J. (author), van Well, A.A. (author), Offerman, S.E. (author)

In-situ Small-Angle Neutron Scattering (SANS) is used to determine the time evolution of the chemical composition of precipitates at 650 °C and 700 °C in three micro-alloyed steels with different vanadium (V) and carbon (C) concentrations. Precipitates with a distribution of substoichiometric carbon-to-metal ratios are measured in all steels....

journal article 2020

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Time of flight modulation of intensity by zero effort on Larmor

Geerits, N. (author), Parnell, S.R. (author), Thijs, M.A. (author), van Well, A.A. (author), Franz, C. (author), Washington, A. L. (author), Raspino, D. (author), Dalgliesh, R. M. (author), Plomp, J. (author)

A time-of-flight modulation of intensity by zero effort spectrometer mode has been developed for the Larmor instrument at the ISIS pulsed neutron source. The instrument utilizes resonant spin flippers that employ electromagnets with pole shoes, allowing the flippers to operate at frequencies up to 3 MHz. Tests were conducted at modulation...

journal article 2019

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Direct Comparison of PdAu Alloy Thin Films and Nanoparticles upon Hydrogen Exposure

Bannenberg, L.J. (author), Nugroho, Ferry Anggoro Ardy (author), Schreuders, H. (author), Norder, B. (author), Trinh, Thuy-Trang (author), Steinke, N.J. (author), van Well, A.A. (author), Langhammer, Christoph (author), Dam, B. (author)

Nanostructured metal hydrides are able to efficiently detect hydrogen in optical sensors. In the literature, two nanostructured systems based on metal hydrides have been proposed for this purpose each with its own detection principle: continuous sub-100 nm thin films read out via optical reflectance/transmittance changes and nanoparticle arrays...

journal article 2019

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Interaction of precipitation with austenite-to-ferrite phase transformation in vanadium micro-alloyed steels

Ioannidou, C. (author), Arechabaleta Guenechea, Z. (author), Navarro Lopez, A. (author), Rijkenberg, Arjan (author), Dalgliesh, Robert M. (author), Kölling, S. (author), Bliznuk, Vitaliy (author), Pappas, C. (author), Sietsma, J. (author), van Well, A.A. (author), Offerman, S.E. (author)

The precipitation kinetics of vanadium carbides and its interaction with the austenite-to-ferrite phase transformation is studied in two micro-alloyed steels that differ in vanadium and carbon concentrations by a factor of two, but have the same vanadium-to-carbon atomic ratio of 1:1. Dilatometry is used for heat-treating the specimens and...

journal article 2019

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RF neutron spin flippers in time of flight Spin-Echo Resolved Grazing Incidence Scattering (SERGIS)

Parnell, S.R. (author), Dalgliesh, R. M. (author), Steinke, N. J. (author), Plomp, J. (author), van Well, A.A. (author)

RF coils have been routinely used for Larmor labelling on the Offspec instrument at ISIS. These coils encode directional information via the neutron polarization using a series of parallelogram-shaped pole shoes which can be tuned to different angles with an RF gradient flipper in the centre of each magnet. We report on measurements of the...

journal article 2018

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VC-precipitation kinetics studied by Small-Angle Neutron Scattering in nano-steels

Ioannidou, C. (author), Arechabaleta Guenechea, Z. (author), Rijkenberg, Arjan (author), Dalgliesh, Robert M. (author), van Well, A.A. (author), Offerman, S.E. (author)

Nanosteels are used in automotive applications to accomplish resource-efficiency while providing high-tech properties. Quantitative data and further understanding on the precipitation kinetics in Nanosteels can contribute to fulfil this goal. Small-Angle Neutron Scattering measurements are performed on a Fe-C-Mn-V steel, previously heat-treated...

journal article 2018

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Hafnium - an optical hydrogen sensor spanning six orders in pressure

Boelsma, C. (author), Bannenberg, L.J. (author), Van Setten, M. J. (author), Steinke, N.J. (author), van Well, A.A. (author), Dam, B. (author)

Hydrogen detection is essential for its implementation as an energy vector. So far, palladium is considered to be the most effective hydrogen sensing material. Here we show that palladium-capped hafnium thin films show a highly reproducible change in optical transmission in response to a hydrogen exposure ranging over six orders of magnitude...

journal article 2017

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Neutron Larmor diffraction with double and single precession arm

van Well, A.A. (author), Rekveldt, M.T. (author)

A review is given of double and single arm Larmor diffraction. With the former a lattice-spacing resolution down to 10-6 can be obtained. The latter is a good high-resolution alternative if the sample or sample environment disturbs the magnetic field, e.g. ferromagnetic samples or applied magnetic fields. By choosing the tilt angle of the...

conference paper 2017

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Design and performance of a novel neutron powder diffractometer: PEARL at TU Delft

van Eijck, L. (author), Cussen, L. D. (author), Sykora, G. J. (author), Schooneveld, E. M. (author), Rhodes, N. J. (author), van Well, A.A. (author), Pappas, C. (author)

The performance of the new neutron powder diffraction instrument PEARL that is installed at the research reactor of Delft University of Technology is reported. It is based on the optimization concepts developed by Cussen [Nucl. Instrum. Methods Phys. Res. Sect. A (2007), 583, 394-406], which lead to high performance competing with existing...

journal article 2016

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Impact of Nanostructuring on the Phase Behavior of Insertion Materials: The Hydrogenation Kinetics of a Magnesium Thin Film

Bannenberg, L.J. (author), Schreuders, H. (author), van Eijck, L. (author), Heringa, J.R. (author), Steinke, N.J. (author), Dalgliesh, R.M. (author), Dam, B. (author), Mulder, F.M. (author), van Well, A.A. (author)

Nanostructuring is widely applied in both battery and hydrogen materials to improve the performance of these materials as energy carriers. Nanostructuring changes the diffusion length as well as the thermodynamics of materials. We studied the impact of nanostructuring on the hydrogenation in a model system consisting of a thin film of magnesium...

journal article 2016

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Quasielastic neutron scattering experiment on water using TOFLAR (Time Of Flight and LARmor precession) technique at SNS

Kusmin, A. (author), Van Eijck, L. (author), Pappas, C. (author), Zolnierczuk, P.A. (author), Arend, N. (author), Ohl, M. (author), Van Well, A.A. (author)

We present the results of the first TOFLAR (Time Of Flight and LARmor precession) experiment with a Larmor modulation device positioned after the sample. Using a setup based on the configuration of the SNS-NSE spectrometer (Spallation Neutron Source, USA), we did TOFLAR measurements on water at 5 and 20 degree Celsius, analyzed the spectra, and...

conference paper 2015

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Measurement of gravitation-induced quantum interference for neutrons in a spin-echo spectrometer

De Haan, V.O. (author), Plomp, J. (author), Van Well, A.A. (author), Rekveldt, M.T. (author), Hasegawa, Y.H. (author), Dalgliesh, R.M. (author), Steinke, N.J. (author)

With a neutron spin-echo reflectometer (OffSpec at ISIS, UK) it is possible to measure the gravitation-induced quantum phase difference between the two spin states of the neutron wave function in a magnetic field. In the small-angle approximation, this phase depends linearly on the inclination angle of the neutron beam with respect to the...

journal article 2014

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Larmor neutron diffraction with one precession arm

Rekveldt, M.T. (author), Plomp, J. (author), Van Well, A.A. (author)

A new variant of Larmor neutron diffraction, applying only a single precession arm in the initial beam, is proposed. The single arm, together with the polarizer and analyser and possible rotators, are mounted in front of the sample. The great advantage with respect to the case with another precession arm in the reflected beam is that magnetic...

journal article 2014