Direct measurement of the inertial confinement time in a magnetically driven implosion
Direct measurement of the inertial confinement time in a magnetically driven implosion
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直接测量磁驱动内爆中的惯性约束时间
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
D. Sinars
中科院分区：
文献类型：
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作者：
P. Knapp;Matthew J. Martin;D. Dolan;K. Cochrane;D. Dalton;J. Davis;C. Jennings;G. Loisel;D. Romero;I. Smith;E. Yu;M. Weis;T. Mattsson;R. Mcbride;K. Peterson;J. Schwarz;D. Sinars
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We report on direct, radiographic measurement of the stagnation phase of a magnetically driven liner implosion. The liner is filled with liquid deuterium and imploded to a minimum radius of 440 μm (radial convergence ratio of 7.7) over 300 ns, achieving a density of ≈10 g/cm3. The measured confinement time is ≈14 ns, compared to 16 ns from 1D simulations. A comparison of measured density profiles with 1D and 2D simulations shows a deviation in the reflected shock trajectory and the liner areal density. Additionally, the magneto Rayleigh-Taylor instability causes enhanced compression with shorter confinement in the bubble region compared to the spikes. These effects combine to reduce the pressure-confinement time product, Pτ, by 25% compared to the simulations.