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bibo:Article rdac:C10001

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n5:physicsofgasesplasmasandelectricdischarges n5:letter

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Numerical investigation on the stabilization of the deceleration phase Rayleigh-Taylor instability due to alpha particle heating in ignition target

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2012-01-01

rdaw:P10072

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n2:xuxiaowen n2:zhushaoping n2:limeng n2:peiwenbing n2:wanglifeng n2:yewenhua n11:50bd8c21bfafa6e4e962f6a948b1ef92 n2:wujunfeng n2:daizhensheng

dcterms:abstract

Tritium-hydrogen-deuterium (THD) target is adopted in order to experimentally diagnose the properties of the ignition hot spot and the highly compressed main fusion fuel (E dwards M. J. et al., Phys. Plasmas, 18 (2011) 051003). As compared with deuterium-tritium (DT) target, the thermonuclear alpha particles which are needed to heat the fusion fuel, are much less in the THD target. In the present paper, the effect of alpha particle heating on the deceleration phase Rayleigh-Taylor instability (dp-RTI), which is one of the key problems in hot spot formation, is investigated systematically through numerical simulations. It is found that the mass ablation at the hot spot boundary is greatly increased due to the direct alpha particle heating. As a result, the dp-RTI growth rates are greatly reduced and the cut-off mode number decreases greatly from about 33 to 17. This explains why the hydrodynamic instability in the THD target grows more severely than in the DT ignition target.

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n10:rapidcommunication

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epl14860

dcterms:dateCopyrighted

2012-01-01

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© EPLA, 2012

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ELPA

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