Species separation and modification of neutron diagnostics in inertial-confinement fusion
CEA, DAM, DIF - 91297 Arpajon Cedex, France
Received: 16 June 2014
Accepted: 29 August 2014
The different behaviours of deuterium (D) and tritium (T) in the hot spot of marginally igniting cryogenic DT inertial-confinement fusion (ICF) targets are investigated with an ion Fokker-Planck model. With respect to an equivalent single-species model, a higher density and a higher temperature are found for T in the stagnation phase of the target implosion. In addition, the stagnating hot spot is found to be less dense but hotter than in the single-species case. As a result, the fusion reaction yield in the hot spot is significantly increased. Fusion neutron diagnostics of the implosion find a larger ion temperature as deduced from DT reactions than from DD reactions, in good agreement with NIF experimental results. ICF target designs should thus definitely take ion-kinetic effects into account.
PACS: 52.57.-z – Laser inertial confinement / 52.65.Ff – Fokker-Planck and Vlasov equation / 52.35.Tc – Shock waves and discontinuities
© EPLA, 2014