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

Simppa Äkäslompolo (Corresponding Author), Jan Paul Koschinsky, Joona Kontula, Christoph Biedermann, Sergey Bozhenkov, Taina Kurki-Suonio, Jaakko Leppänen, Antti Snicker, Robert Wolf, Glen Wurden, W7-X Team

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)


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.

Original languageEnglish
Article number112347
JournalFusion Engineering and Design
Publication statusPublished - Jun 2021
MoE publication typeA1 Journal article-refereed


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


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