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.
- Gamma-ray spectrometry
- Fast-ion diagnosis
, Nocente, M., Gorini, G., Jacobsen, A. S.
, Kiptily, V. G., Korsholm, S. B.
, ... Tardocchi, M. (2016). Fast-ion energy resolution by one-step reaction gamma-ray spectrometry
. Nuclear Fusion
(4), . https://doi.org/10.1088/0029-5515/56/4/046009