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

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 magnetiz...

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Bibliographic Details
Published in:Nuclear fusion 2016-04, Vol.56 (4), p.46009-46019
Main Authors: Salewski, M., Nocente, M., Gorini, G., Jacobsen, A.S., Kiptily, V.G., Korsholm, S.B., Leipold, F., Madsen, J., Moseev, D., Nielsen, S.K., Rasmussen, J., Stejner, M., Tardocchi, M.
Format: Article
Language:English
Subjects:
Energy resolution
fast-ion diagnostics
Gamma rays
gamma-ray spectrometry
Nuclear fusion
Plasmas
Reactions (nuclear)
Spectrometry
Spectroscopy
tokamak
Weight function
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Summary: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.
ISSN:0029-5515
1741-4326
1741-4326
DOI:10.1088/0029-5515/56/4/046009