Fusion product studies via fast ion D–D and D–3He fusion on JET. (24th August 2016) - Sharapov, S.E.
Abstract: Dedicated fast ion D–D and D– 3 He fusion experiments were performed on JET with carbon wall (2008) and ITER-like wall (2014) for testing the upgraded neutron and energetic ion diagnostics of fusion products. Energy spectrum of D–D neutrons was the focus of the studies in pure deuterium plasmas. A significant broadening of the energy spectrum of neutrons born in D–D fast fusion was observed, and dependence of the maximum D and D–D neutron energies on plasma density was established. Diagnostics of charged products of aneutronic D– 3 He fusion reactions, 3.7 MeV alpha-particles similar to those in D–T fusion, and 14.6 MeV protons, were the focus of the studies in D– 3 He plasmas. Measurements of 16.4 MeV gamma-rays born in the weak secondary branch of D( 3 He, γ ) 5 Li reaction were used for assessing D– 3 He fusion power. For achieving high yield of D–D and D– 3 He reactions at relatively low levels of input heating power, an acceleration of D beam up to the MeV energy range was used employing 3rd harmonic ( f = 3 f C D ) ICRH technique. These results were compared to the techniques of D beam injection into D– 3 He mixture, and 3 He-minority ICRH in D plasmas.