Fast-ion energy resolution by one-step reaction gamma-ray spectrometry

Mirko Salewski, M. Nocente, G. Gorini, Asger Schou Jacobsen, V.G. Kiptily, Søren Bang Korsholm, Frank Leipold, Jens Madsen, Dmitry Moseev, Stefan Kragh Nielsen, Jesper Rasmussen, Morten Stejner Pedersen, M. Tardocchi

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The spectral broadening of γ-rays from fusion plasmas can be measured in high-resolution gamma-ray spectrometry (GRS). We derive weight functions that determine the observable velocity space and quantify the velocity-space sensitivity of one-step reaction high-resolution GRS measurements in magnetized fusion plasmas. The weight functions suggest that GRS resolves the energies of fast ions directly without the need for tomographic inversion for selected one-step reactions at moderate plasma temperatures. The D(p,γ)3He reaction allows the best direct fast-ion energy resolution. We illustrate our general formalism using reactions with and without intrinsic broadening of the γ-rays for the GRS diagnostic at JET.
Original languageEnglish
Article number046009
JournalNuclear Fusion
Issue number4
Number of pages11
Publication statusPublished - 2016


  • Gamma-ray spectrometry
  • Tokamak
  • Fast-ion diagnosis


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