ASCOT simulations of 14 MeV neutron rates in W7-X: effect of magnetic configuration

, J. Kontula*, S. Akaslompolo, T. Kurki-Suonio

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


Neutron production rates in fusion devices are determined not only by the kinetic profiles but also the fast ion slowing-down distributions. In this work, we investigate the effect of magnetic configuration on neutron production rates in future deuterium plasmas in the Wendelstein 7-X stellarator. The neutral beam injection, beam and triton slowing-down distributions, and the fusion reactivity are simulated with the ASCOT suite of codes. The results indicate that the magnetic configuration has only a small effect on the production of 2.45 MeV neutrons from thermonuclear and beam-target fusion. The 14.1 MeV neutron production rates were found to be between 1.49x10(12) and 1.67x10(12) s(-1), which is estimated to be sufficient for a time-resolved detection using a scintillating fiber detector, although only in high-performance discharges.

Original languageEnglish
Article number035022
Number of pages9
JournalPlasma Physics and Controlled Fusion
Issue number3
Publication statusPublished - Mar 2021
MoE publication typeA1 Journal article-refereed


  • W7-X
  • fast ion physics
  • triton burn-up
  • deuterium plasmas
  • neutron diagnostics

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