Journal Article

IMPULSE-2025-00026

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png An intense source of very cold neutrons using solid deuterium and nanodiamonds for the European Spallation Source

Rizzi, N. ; Folsom, B. ; Akhyani, M. ; Bertelsen, M. ; Böni, P.MLZ* ; Beßler, Y. ; Bryś, T. ; Chambon, A. ; Czamler, V. ; Lauritzen, B. ; Damián, J. I. M. ; Nesvizhevsky, V. ; Rataj, B. ; Samothrakitis, S. ; Santoro, V. ; Shuai, H. ; Strobl, M. ; Strothmann, M. ; Takibayev, A. ; Wagner, R. ; Zanini, L. ; Zimmer, O.

2024
Elsevier [Amsterdam]

Please use a persistent id in citations: doi:10.1016/j.nima.2024.169215

Abstract: The European Spallation Source (ESS), currently under construction, is based on a high-brightness, bi-spectral, low-dimensional moderator placed above a spallation target, intended to initially serve fifteen neutron scattering instruments. Within the upgrade path of ESS, the HighNESS project aims at designing a source complementary to this upper moderator, focusing on delivering a higher intensity and a colder spectrum of neutrons. We have investigated the use of solid ortho-deuterium at 5 K as a source of very cold neutrons (VCNs). This source performs competitively as a high-intensity cold-neutron moderator, while also showing an order-of-magnitude flux increase in the very cold range above 40 ̊ A compared to a liquid deuterium moderator of similar volume and shape, also designed within HighNESS. The long-wavelength performance of the source can be improved further by encasing it in a thin layer of nanodiamonds.The cooling of a solid deuterium moderator placed so close to the spallation target of a high-power neutron source like ESS is very challenging, but may be feasible by augmenting the heat conductivity with the addition of low-density metallic foam structures within the moderator vessel. Such a source could provide unprecedented opportunities in fundamental physics research and neutron scattering using VCNs.

Keyword(s): Instrument and Method Development (1st) ; Instrument and Method Development (2nd)

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Contributing Institute(s):

1. E21 (E21)
2. Heinz Maier-Leibnitz Zentrum (MLZ)

Experiment(s):

1. No specific instrument

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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