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Rosenberg, M J; Rinderknecht, H G; Hoffman, N M; Amendt, P A; Atzeni, S; Zylstra, A B; Li, C K; Séguin, F H; Sio, H; Johnson, M Gatu; Frenje, J A; Petrasso, R D; Glebov, V Yu; Stoeckl, C; Seka, W; Marshall, F J; Delettrez, J A; Sangster, T C; Betti, R; Goncharov, V N; Meyerhofer, D D; Skupsky, S; Bellei, C; Pino, J; Wilks, S C; Kagan, G; Molvig, K; Nikroo, A
Physical review letters, 2014-May-09, Letnik: 112, Številka: 18Journal Article
Clear evidence of the transition from hydrodynamiclike to strongly kinetic shock-driven implosions is, for the first time, revealed and quantitatively assessed. Implosions with a range of initial equimolar D3He gas densities show that as the density is decreased, hydrodynamic simulations strongly diverge from and increasingly overpredict the observed nuclear yields, from a factor of ∼2 at 3.1 mg/cm3 to a factor of 100 at 0.14 mg/cm3. (The corresponding Knudsen number, the ratio of ion mean-free path to minimum shell radius, varied from 0.3 to 9; similarly, the ratio of fusion burn duration to ion diffusion time, another figure of merit of kinetic effects, varied from 0.3 to 14.) This result is shown to be unrelated to the effects of hydrodynamic mix. As a first step to garner insight into this transition, a reduced ion kinetic (RIK) model that includes gradient-diffusion and loss-term approximations to several transport processes was implemented within the framework of a one-dimensional radiation-transport code. After empirical calibration, the RIK simulations reproduce the observed yield trends, largely as a result of ion diffusion and the depletion of the reacting tail ions.
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