Fast-ion energy resolution by one-step reaction gamma-ray spectrometry. (2nd March 2016)

• Record Type: Journal Article
• 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.
• Other Names: collab.
• Is Part Of: Nuclear fusion. Volume 56:Number 4(2016:Apr.)
• Publication Date: 2016-03-02
• Subjects: gamma-ray spectrometry -- tokamak -- fast-ion diagnostics; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/0029-5515/56/4/046009
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: 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 ) 3 He 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.