Velocity-space sensitivity of neutron spectrometry measurements

Asger Schou Jacobsen, Mirko Salewski, J. Eriksson, G. Ericsson, Søren Bang Korsholm, Frank Leipold, Stefan Kragh Nielsen, Jesper Rasmussen, Morten Stejner Pedersen

Research output: Contribution to journalJournal articleResearchpeer-review


Neutron emission spectrometry (NES) measures the energies of neutrons produced in fusion reactions. Here we present velocity-space weight functions for NES and neutron yield measurements. Weight functions show the sensitivity as well as the accessible regions in velocity space for a given range of the neutron energy spectrum. Combined with a calculated fast-ion distribution function, they determine the part of the distribution function producing detectable neutrons in a given neutron energy range. Furthermore, we construct a forward model based on weight functions capable of rapidly calculating neutron energy spectra. This forward model can be inverted and could thereby be used to directly measure the fast-ion phase-space distribution functions, possibly in combination with other fast-ion diagnostics. The presented methods and results can be applied to neutron energy spectra measured by any kind of neutron spectrometer and to any neutron yield measurement.
Original languageEnglish
Article number053013
JournalNuclear Fusion
Number of pages13
Publication statusPublished - 2015


  • Neutron emission spectrometry
  • Velocity-space sensitivity
  • Fast ions
  • Energetic particles
  • Plasma diagnostics


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