Fusion product studies via fast ion D-D and D-3He fusion on JET
S. E. Sharapov
(1, 2)
,
T. Hellsten
(1, 2)
,
V. G. Kiptily
(1, 2)
,
T. Craciunescu
(1, 2)
,
J. Eriksson
(1, 2)
,
M. Fitzgerald
(1, 2)
,
J.-B. Girardo
(1, 2)
,
V. Goloborod'Ko
(1, 2)
,
C. Hellesen
(1, 2)
,
Åke Hjalmarson
(1, 2)
,
T. Johnson
(1, 2)
,
Y. Kazakov
(1, 2)
,
T. Koskela
(1, 2)
,
M. Mantsinen
(1, 2)
,
I. Monakhov
(1, 2)
,
F. Nabais
(1, 2)
,
M. Nocente
(1, 2)
,
C. Perez von Thun
(1, 2)
,
F. Rimini
(1, 2)
,
M. Santala
(1, 2)
,
M. Schneider
(1, 2)
,
M. Tardocchi
(1, 2)
,
M. Tsalas
(1, 2)
,
V. Yavorskij
(1, 2)
,
V. Zoita
(1, 2)
,
Jet Contributors
(1, 2)
Résumé
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, gamma)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 (f=3{{f}CD} ) ICRH technique. These results were compared to the techniques of D beam injection into D-3He mixture, and 3He-minority ICRH in D plasmas.