Fast-ion orbit sensitivity of neutron emission spectroscopy diagnostics

H. Järleblad*, L. Stagner, M. Salewski, J. Eriksson, S. Benjamin, B. Madsen, M. Nocente, J. Rasmussen, B.S. Schmidt

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

138 Downloads (Pure)


Fast ions in fusion plasmas often leave characteristic signatures in the plasma neutron emission. Measurements of this emission are subject to the phase-space sensitivity of the diagnostic, which can be mapped using weight functions. In this paper, we present orbit weight functions for the TOFOR and NE213 neutron diagnostics at the Joint European Torus, mapping their phase-space sensitivity in 3D orbit space. Both diagnostics are highly sensitive to fast ions that spend a relatively large fraction of their orbit transit times inside the viewing cone of the diagnostic. For most neutron energies, TOFOR is found to be relatively sensitive to potato orbits and heavily localized counter-passing orbits, as well as trapped orbits whose “banana tips” are inside the viewing cone of TOFOR. For the NE213-scintillator, the sensitivity is found to be relatively high for stagnation orbits.
Original languageEnglish
Article number043526
JournalReview of Scientific Instruments
Issue number4
Number of pages1
Publication statusPublished - 2021


Dive into the research topics of 'Fast-ion orbit sensitivity of neutron emission spectroscopy diagnostics'. Together they form a unique fingerprint.

Cite this