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Shan, L Q; Cai, H B; Zhang, W S; Tang, Q; Zhang, F; Song, Z F; Bi, B; Ge, F J; Chen, J B; Liu, D X; Wang, W W; Yang, Z H; Qi, W; Tian, C; Yuan, Z Q; Zhang, B; Yang, L; Jiao, J L; Cui, B; Zhou, W M; Cao, L F; Zhou, C T; Gu, Y Q; Zhang, B H; Zhu, S P; He, X T
Physical review letters, 05/2018, Letnik: 120, Številka: 19Journal Article
We present the first experimental evidence supported by simulations of kinetic effects launched in the interpenetration layer between the laser-driven hohlraum plasma bubbles and the corona plasma of the compressed pellet at the Shenguang-III prototype laser facility. Solid plastic capsules were coated with carbon-deuterium layers; as the implosion neutron yield is quenched, DD fusion yield from the corona plasma provides a direct measure of the kinetic effects inside the hohlraum. An anomalous large energy spread of the DD neutron signal (∼282 keV) and anomalous scaling of the neutron yield with the thickness of the carbon-deuterium layers cannot be explained by the hydrodynamic mechanisms. Instead, these results can be attributed to kinetic shocks that arise in the hohlraum-wall-ablator interpenetration region, which result in efficient acceleration of the deuterons (∼28.8 J, 0.45% of the total input laser energy). These studies provide novel insight into the interactions and dynamics of a vacuum hohlraum and near-vacuum hohlraum.
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