Improved beam extraction at compact neutron sources using diamonds nanoparticles and supermirrors

Jamalipour, Mostafa; Zanini, L.; Klinkby, E. B.; Gorini, G.; Willendrup, Peter Kjær

doi:10.1016/j.nima.2022.166719

Cited by 9 publications

(6 citation statements)

References 41 publications

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“…While diluting the source brightness into a larger volume element of beam phase space, such a channel can increase the total neutron flux with respect to an uncoated extraction tube. A recent paper has indicated possible gains close to a factor of two in the flux of neutrons with divergence less than 2°, and an order-of-magnitude gain for neutrons with divergence more than 2° [25]. These gains extend over the CN and VCN range.…”

Section: Use Of Advanced Reflectorsmentioning

confidence: 99%

Very cold and ultra cold neutron sources for ESS

Zanini

Dian

DiJulio

et al. 2023

JNR

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The goal of the “Workshop on Very Cold and Ultra Cold Neutron Sources for ESS” was to discuss scientific cases, ideas and possibilities for the implementation of sources of Very Cold and Ultra Cold neutrons at the European Spallation Source. The ESS facility, presently under construction, offers several possibilities for in-pile UCN or VCN sources, in primis thanks to the available space below the spallation target where additional neutron sources can be placed to complement those above the target. Neutron beams can be extracted over a wide angular range with a grid of forty-two beamports with 6° average angular separation, allowing future instruments to be installed which may view either the upper or lower moderator systems. Of greatest interest for fundamental physics is the so-called Large Beamport foreseen for the NNBAR experiment. This beamport is also particularly well suited to feed a UCN source, for which several ideas were presented that employ either superfluid helium or solid deuterium as established neutron converter materials. Concepts for VCN sources make use of novel materials for VCN production and/or advanced reflectors to increase yields in the coldest part of the neutron spectrum from a cryogenic neutron source. In this paper we discuss these ideas and the possible locations of UCN and VCN sources at ESS.

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Section: Use Of Advanced Reflectorsmentioning

confidence: 99%

Very cold and ultra cold neutron sources for ESS

Zanini

Dian

DiJulio

et al. 2023

JNR

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“…As can be seen from Figure 1 , there is a large gap in the reflectivity of existing reflectors in the range of VCNs and CNs. A series of papers [ 20 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 ] explores the possibility of designing effective VCN reflectors in this so-called reflectivity gap in order to increase VCN fluxes extracted from neutron sources and, possibly, to provide the storage of VCNs in closed traps for research. The solution of this problem opens up prospects for the wide use of VCNs in neutron physics.…”

Section: Conventional Neutron Reflectors and Their Applicationsmentioning

confidence: 99%

“…The fact is that any new method is of interest only if it is actively used in practice. At the moment, the applicability of the method of nanodiamond reflectors of slow neutrons has already been convincingly proven; some specific projects have already been proposed [ 32 , 78 , 79 ], but they have not yet been implemented.…”

Section: Projects To Use Nd Reflectors To Enhance Vcn and Cn Fluxesmentioning

confidence: 99%

Powders of Diamond Nanoparticles as a Promising Material for Reflectors of Very Cold and Cold Neutrons

Lychagin,

Dubois,

Nesvizhevsky

2024

Nanomaterials

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More than 15 years ago, the study of nanodiamond (ND) powders as a material for designing reflectors of very cold neutrons (VCNs) and cold neutrons (CNs) began. Such reflectors can significantly increase the efficiency of using such neutrons and expand the scope of their application for solving applied and fundamental problems. This review considers the principle of operation of VCN and CN reflectors based on ND powders and their advantages. Information is presented on the performed experimental and theoretical studies of the effect of the size, structure, and composition of NDs on the efficiency of reflectors. Methods of chemical and mechanical treatments of powders in order to modify their chemical composition and structure are discussed. The aim is to avoid, or at least to decrease, the neutron inelastic scatterers and absorbers (mainly hydrogen atoms but also metallic impurities and nitrogen) as well as to enhance coherent elastic scattering (to destroy ND clusters and sp2 carbon shells on the ND surface that result from the preparation of NDs). Issues requiring further study are identified. They include deeper purification of NDs from impurities that can be activated in high radiation fluxes, the stability of NDs in high radiation fluxes, and upscaling methods for producing larger quantities of ND powders. Possible ways of solving these problems are proposed.

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“…The aggregation of nanosized particles matches the wavelength of below cold neutrons, resulting in a similar effect to coherent scattering, or so-called Bragg scattering, leading to higher neutron intensities. Nanodiamonds [ 6 , 7 , 8 , 9 , 10 ] and magnesium hydride (MgH 2 ) [ 11 ] have recently been reported numerically and experimentally, with the potential to increase neutron intensity by several orders of magnitude. The major challenge with nanodiamonds in practical applications is the molding method.…”

Section: Introductionmentioning

confidence: 99%

New Material Exploration to Enhance Neutron Intensity below Cold Neutrons: Nanosized Graphene Flower Aggregation

et al. 2022

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It is proposed that nanosized graphene aggregation could facilitate coherent neutron scattering under particle size conditions similar to nanodiamonds to enhance neutron intensity below cold neutrons. Using the RIKEN accelerator-driven compact neutron source and iMATERIA at J-PARC, we performed neutron measurement experiments, total neutron cross-section, and small-angle neutron scattering on nanosized graphene aggregation. For the first time, the measured data revealed that nanosized graphene aggregation increased the total neutron cross-sections and small-angle scattering in the cold neutron energy region. This is most likely due to coherent scattering, resulting in higher neutron intensities, similar to nanodiamonds.

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Improved beam extraction at compact neutron sources using diamonds nanoparticles and supermirrors

Cited by 9 publications

References 41 publications

Very cold and ultra cold neutron sources for ESS

Very cold and ultra cold neutron sources for ESS

Powders of Diamond Nanoparticles as a Promising Material for Reflectors of Very Cold and Cold Neutrons

New Material Exploration to Enhance Neutron Intensity below Cold Neutrons: Nanosized Graphene Flower Aggregation

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