Serpent neutronics model of Wendelstein 7-X for 14.1 MeV neutrons

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2021-06

Department

Department of Applied Physics

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Language

en

Pages

5

Series

Fusion Engineering and Design, Volume 167

Abstract

In this work, a Serpent 2 neutronics model of the Wendelstein 7-X (W7-X) stellarator is prepared, and an response function for the Scintillating-Fibre neutron detector (SciFi) is calculated using the model. The neutronics model includes the simplified geometry for the key components of the stellarator itself as well as the torus hall. The objective of the model is to assess the 14.1 MeV neutron flux from deuteron-triton fusions in W7-X, where the neutrons are modelled only until they have slowed down to 1 MeV energy. The key messages of this article are: demonstration of unstructured mesh geometry usage for stellarators, W7-X in particular; technical documentation of the model and first insights in fast neutron behaviour in W7-X, especially related to the SciFi: the model indicates that the superconducting coils are the strongest scatterers and block neutrons from large parts of the plasma. The back-scattering from e.g. massive steel support structures is found to be small. The SciFi will detect neutrons from an extended plasma volume in contrast to having an effective line-of-sight.

Description

| openaire: EC/H2020/633053/EU//EUROfusion

Keywords

Neutrons, Scintillating fibre, Serpent, Simulation, Wendelstein 7-X

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DOI

10.1016/j.fusengdes.2021.112347

Citation

Äkäslompolo, S, Kontula, J, Kurki-Suonio, T, Snicker, A & W7-X Team 2021, ' Serpent neutronics model of Wendelstein 7-X for 14.1 MeV neutrons ', Fusion Engineering and Design, vol. 167, 112347 . https://doi.org/10.1016/j.fusengdes.2021.112347

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https://urn.fi/URN:NBN:fi:aalto-202103102301

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[article-cris] Perustieteiden korkeakoulu / SCI