Gamma-ray measurements of 10B(alpha, p gamma)13C reaction for alpha-particle diagnostics in fusion plasmas
In Joint European Torus with beryllium as a main impurity in the plasma, the confined fusion α-particle diagnosing was based on detection of γ-rays due to the 9Be(α,nγ)12C nuclear reaction. The same diagnostic approach was accepted in the earlier International Thermonuclear Experimental Reactor designed with Be-wall. However, in the today’s non-beryllium design, the main impurity could be boron due to the boronisation of the plasma vessel. For this case, the 10B(a,pg)13C reaction is proposed for the α-particle diagnostics. Aiming to apply this approach in fusion devises with boron impurity, results of in-beam studies of this reaction are presented. Excitation functions of the first three states of 13C were derived from the measured γ-ray angular distributions in the α-particle energy range 1.25 – 4.2 MeV. Also, high energy resolution γ-ray spectra were exploited to infer the proton differential cross-sections using the Doppler γ-line shape analysis. The obtained results are compared with other available data. The application of the 10B(a,pg)13C reaction for diagnosing of both energetic 4He-ions and fusion-bone α-particles is proposed.