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Open Access Publications from the University of California

Fusion product studies via fast ion D-D and D-3He fusion on JET

  • Author(s): Sharapov, SE;
  • Hellsten, T;
  • Kiptily, VG;
  • Craciunescu, T;
  • Eriksson, J;
  • Fitzgerald, M;
  • Girardo, JB;
  • Goloborod'Ko, V;
  • Hellesen, C;
  • Hjalmarsson, A;
  • Johnson, T;
  • Kazakov, Y;
  • Koskela, T;
  • Mantsinen, M;
  • Monakhov, I;
  • Nabais, F;
  • Nocente, M;
  • Perez Von Thun, C;
  • Rimini, F;
  • Santala, M;
  • Schneider, M;
  • Tardocchi, M;
  • Tsalas, M;
  • Yavorskij, V;
  • Zoita, V
  • et al.

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Dedicated fast ion D-D and D-3He 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-3He 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-3He plasmas. Measurements of 16.4 MeV gamma-rays born in the weak secondary branch of D(3He, γ)5Li reaction were used for assessing D-3He fusion power. For achieving high yield of D-D and D-3He 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 () ICRH technique. These results were compared to the techniques of D beam injection into D-3He mixture, and 3He-minority ICRH in D plasmas.

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