The HighNESS Project at the European Spallation Source: Current Status and Future Perspectives

Santoro, V.; Andersen, K. H.; Bentley, P.; Bernasconi, M.; Bertelsen, M.; Beßler, Y.; Bianchi, A.; Brys, T.; Campi, D.; Chambon, A.; Czamler, V.; Di Julio, D. D.; Dian, E.; Dunne, K.; Ferreira, M. J.; Fierlinger, P.; Friman-Gayer, U.; Folsom, B. T.; Gaye, A.; Gorini, G.; Happe, C.; Holl, M.; Kamyshkov, Y.; Kittelmann, T.; Klinkby, E. B.; Kolevatov, R.; Laporte, S. I.; Lauritzen, B.; Marquez Damian, J. I.; Meirose, B.; Mezei, F.; Milstead, D.; Muhrer, G.; Neshvizhevsky, V.; Rataj, B.; Rizzi, N.; Rosta, L.; Samothrakitis, S.; Schober, H.; Selknaes, J. R.; Silverstein, S.; Strobl, M.; Strothmann, M.; Takibayev, A.; Wagner, R.; Willendrup, P.; Xu, S.; Yiu, S. C.; Zanini, L.; Zimmer, O.

doi:10.1080/00295639.2023.2204184

Cited by 4 publications

(2 citation statements)

References 54 publications

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“…As anticipated due to the lower abundance of paramagnetic oxygen and the larger neutron absorption due to the carbon, O 2 −C 60 performs less efficiently in the cold and VCN energy range compared to deuterated clathrate hydrates. Similar calculations as presented in this section for infinite media were already performed within the HighNESS project, for studying possible source/moderator configurations for the European Spallation Source [4,65].…”

Section: Neutron Spectrum In Infinite Mediamentioning

confidence: 98%

Physical model of neutron scattering by clathrate hydrate and C 60 hosting paramagnetic oxygen molecules

Xu (许树琪),

DiJulio,

Marquez Damian

et al. 2024

J. Phys.: Condens. Matter

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This paper describes the physical modelling of neutron scattering in two polycrystalline inclusion compounds, fully deuterated clathrate hydrate and C 60 , each with paramagnetic oxygen as guest molecules. For studying the suitability of these materials for neutron moderation to very low energies, the model includes, in addition to the magnetic neutron scattering by the oxygen, the nuclear scattering by all constituents. The theoretical total cross sections are calculated based on the phonon density of states obtained by density functional theory and molecular dynamics simulations. At low temperatures, the developed scattering kernels are in good agreement with experimental neutron scattering data reported in the literature. At 20 K and above, a Lorentzian distribution for the zero-field splitting of the magnetic substates of the spin triplet of the oxygen molecules helps to reproduce magnetic peaks observed in inelastic neutron scattering experiments better than the original theory based on a single-valued splitting constant. Neutron spectra obtained by Monte Carlo simulations in infinite media are presented, highlighting the potential use of O 2 -containing fully deuterated clathrate hydrate as a neutron moderator for the production of very cold neutrons.

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Section: Neutron Spectrum In Infinite Mediamentioning

confidence: 98%

Physical model of neutron scattering by clathrate hydrate and C 60 hosting paramagnetic oxygen molecules

Xu (许树琪),

DiJulio,

Marquez Damian

et al. 2024

J. Phys.: Condens. Matter

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“…However, the current infrastructure of ESS allows a second moderator to be constructed and positioned below the spallation target. This second moderator was considered in the EU Horizon 2020 project HighNESS to have a larger viewable area and to offer higher intensities with particular intensity gains at long wavelengths [4][5][6] . Also, very cold (10-40 Å), and ultra cold (> 100 Å) neutron sources are under consideration 6,7 .…”

Section: Introductionmentioning

confidence: 99%

Neutron Instrument Concepts for a High Intensity Moderator at the European Spallation Source

Samothrakitis,

Bertelsen,

Willendrup

et al. 2024

Preprint

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In the course of the Horizon 2020 project HighNESS, a second moderator concept has been developed for the European Spallation Source which complements the currently built moderator and is optimized for high intensity with a large viewable surface area. In this work we introduce conceptual designs for neutron instruments for condensed matter research designed to make optimal use of the capabilities of this moderator. The focus is on two concepts for small-angle neutron scattering and one neutron imaging instrument, which are intended to complement corresponding instruments that are already under construction at the European Spallation Source. One small-angle neutron scattering instrument concept resembles a conventional pinhole collimator geometry and aims to profit from the proposed second moderator by enabling to illuminate larger samples and providing particularly high resolution, drawing on a 30 m collimation and corresponding detector distance. A second small-angle neutron scattering instrument concept adopts nested mirror optics that enable to efficiently exploit the large moderator size and provide high resolution by focusing on the detector. The neutron imaging instrument concept is a typical pinhole instrument that can be found at continuous sources and draws on the corresponding strengths of high flux and large homogeneous fields-of-view, while still providing moderate wavelength resolution for advanced imaging methods.

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A new scattering kernel for superfluid helium at low temperatures

Granada¹,

DiJulio²,

Damián³

et al. 2023

Nuclear Instruments and Methods in Physics Research Section A:

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The HighNESS Project at the European Spallation Source: Current Status and Future Perspectives

Cited by 4 publications

References 54 publications

Physical model of neutron scattering by clathrate hydrate and C 60 hosting paramagnetic oxygen molecules

Physical model of neutron scattering by clathrate hydrate and C 60 hosting paramagnetic oxygen molecules

Neutron Instrument Concepts for a High Intensity Moderator at the European Spallation Source

A new scattering kernel for superfluid helium at low temperatures

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