High-resolution gamma ray spectroscopy measurements of the fast ion energy distribution in JET4He plasmas

M. Nocente, M. Tardocchi, V.G. Kiptily, P. Blanchard, I. Chugunov, S. Conroy, T. Edlington, A.M. Fernandes, G. Ericsson, M. Gatu Johnson, D. Gin, G. Grosso (+13 others)
2012 Nuclear Fusion  
High-resolution γ -ray measurements were carried out on the Joint European Torus (JET) in an experiment aimed at accelerating 4 He ions in the MeV range by coupling third harmonic radio frequency heating to an injected 4 He beam. For the first time, Doppler broadening of γ -ray peaks from the 12 C(d, pγ ) 13 C and 9 Be(α, nγ ) 12 C reactions was observed and interpreted with dedicated Monte Carlo codes based on the detailed nuclear physics of the processes. Information on the confined 4 He and
more » ... confined 4 He and deuteron energy distribution was inferred, and confined 4 He ions with energies as high as 6 MeV were assessed. A signature of MHD activity in γ -ray traces was also detected. The reported results have a bearing on diagnostics for fast ions in the MeV range in next step fusion devices.
doi:10.1088/0029-5515/52/6/063009 fatcat:6j6jsxuyqncxljl7j6ovo7jr6i