Species separation and modification of neutron diagnostics in inertial-confinement fusion

Abstract

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.

References in corpus (2)

• Electro-diffusion in a plasma with two ion species
• Fokker Planck kinetic modeling of suprathermal alpha-particles in a fusion plasma

Cited by in corpus (8)

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• Observation and modeling of interspecies ion separation in inertial confinement fusion implosions via imaging x-ray spectroscopy
• Kinetic simulations of fusion ignition with hot-spot ablator mix
• Observation of Shock-Front Separation in Multi-Ion-Species Collisional Plasma Shocks
• A conservative phase-space moving-grid strategy for a 1D-2V Vlasov-Fokker-Planck Equation