Direct measurement of the inertial confinement time in a magnetically driven implosion

作者：Knapp P F^*; Martin M R; Dolan D H; Cochrane K; Dalton D; Davis J P; Jennings C A; Loisel G P; Romero D H; Smith I C; Yu E P; Weis M R; Mattsson T R; McBride R D; Peterson K; Schwarz J; Sinars D B

来源：Physics of Plasmas, 2017, 24(4): 042708.

DOI：10.1063/1.4981206

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 mu m (radial convergence ratio of 7.7) over 300 ns, achieving a density of approximate to 10 g/cm(3). The measured confinement time is approximate to 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, P tau, by 25% compared to the simulations. Published by AIP Publishing.

• 出版日期2017-4