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

Abstract

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
Volume55
Number of pages13
ISSN0029-5515
DOIs
Publication statusPublished - 2015

Keywords

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

Cite this

Jacobsen, A. S., Salewski, M., Eriksson, J., Ericsson, G., Korsholm, S. B., Leipold, F., ... Stejner Pedersen, M. (2015). Velocity-space sensitivity of neutron spectrometry measurements. Nuclear Fusion, 55, [053013]. https://doi.org/10.1088/0029-5515/55/5/053013
Jacobsen, Asger Schou ; Salewski, Mirko ; Eriksson, J. ; Ericsson, G. ; Korsholm, Søren Bang ; Leipold, Frank ; Nielsen, Stefan Kragh ; Rasmussen, Jesper ; Stejner Pedersen, Morten. / Velocity-space sensitivity of neutron spectrometry measurements. In: Nuclear Fusion. 2015 ; Vol. 55.
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abstract = "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.",
keywords = "Neutron emission spectrometry, Velocity-space sensitivity, Fast ions, Energetic particles, Plasma diagnostics",
author = "Jacobsen, {Asger Schou} and Mirko Salewski and J. Eriksson and G. Ericsson and Korsholm, {S{\o}ren Bang} and Frank Leipold and Nielsen, {Stefan Kragh} and Jesper Rasmussen and {Stejner Pedersen}, Morten",
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journal = "Nuclear Fusion",
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Velocity-space sensitivity of neutron spectrometry measurements. / Jacobsen, Asger Schou; Salewski, Mirko; Eriksson, J.; Ericsson, G.; Korsholm, Søren Bang; Leipold, Frank; Nielsen, Stefan Kragh; Rasmussen, Jesper; Stejner Pedersen, Morten.

In: Nuclear Fusion, Vol. 55, 053013, 2015.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Velocity-space sensitivity of neutron spectrometry measurements

AU - Jacobsen, Asger Schou

AU - Salewski, Mirko

AU - Eriksson, J.

AU - Ericsson, G.

AU - Korsholm, Søren Bang

AU - Leipold, Frank

AU - Nielsen, Stefan Kragh

AU - Rasmussen, Jesper

AU - Stejner Pedersen, Morten

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

KW - Neutron emission spectrometry

KW - Velocity-space sensitivity

KW - Fast ions

KW - Energetic particles

KW - Plasma diagnostics

U2 - 10.1088/0029-5515/55/5/053013

DO - 10.1088/0029-5515/55/5/053013

M3 - Journal article

VL - 55

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

M1 - 053013

ER -