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首页> 外文期刊>Physics of plasmas >Detailed implosion modeling of deuterium-tritium layered experiments on the National Ignition Facility
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Detailed implosion modeling of deuterium-tritium layered experiments on the National Ignition Facility

机译：国家点火设施上氘-分层实验的详细内爆建模

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More than two dozen inertial confinement fusion ignition experiments with cryogenic deuterium-tritium layers have now been performed on the National Ignition Facility (NIF) [G. H. Miller, Opt. Eng. 443, 2841 (2004)]. Each of these yields a wealth of data including neutron yield, neutron down-scatter fraction, burn-averaged ion temperature, x-ray image shape and size, primary and down-scattered neutron image shape and size, etc. Compared to 2-D radiation-hydrodynamics simulations modeling both the hohlraum and the capsule implosion, however, the measured capsule yield is usually lower by a factor of 5 to 10, and the ion temperature varies from simulations, while most other observables are well matched between experiment and simulation. In an effort to understand this discrepancy, we perform detailed post-shot simulations of a subset of NIF implosion experiments. Using two-dimensional HYDRA simulations [M. M. Marinak, Phys. Plasmas 8, 2275 (2001).] of the capsule only, these simulations represent as accurately as possible the conditions of a given experiment, including the as-shot capsule metrology, capsule surface roughness, and ice layer defects as seeds for the growth of hydrodynamic instabilities. The radiation drive used in these capsule-only simulations can be tuned to reproduce quite well the measured implosion timing, kinematics, and low-mode asymmetry. In order to simulate the experiments as accurately as possible, a limited number of fully three-dimensional implosion simulations are also being performed. Despite detailed efforts to incorporate all of the effects known and believed to be important in determining implosion performance, substantial yield discrepancies remain between experiment and simulation. Some possible alternate scenarios and effects that could resolve this discrepancy are discussed.
机译：现在，在国家点火设施（NIF）上进行了超过二十打的低温氘-layers层惯性约束聚变点火实验[G. H.米勒，选项。 。 443，2841（2004）]。这些中的每一个都产生大量数据，包括中子产率，中子向下散射分数，燃烧平均离子温度，x射线图像形状和尺寸，初级和向下散射中子图像形状和尺寸等。与2-D相比辐射流体动力学模拟同时模拟了水肿和胶囊的内爆，但是，所测得的胶囊产量通常降低5到10倍，并且离子温度随模拟而变化，而其他大多数可观察到的结果在实验和模拟之间都很好地匹配。为了理解这种差异，我们对NIF内爆实验的子集进行了详细的后期模拟。使用二维HYDRA模拟[M. M. Marinak，物理仅限于胶囊的等离子8号，2275（2001）。]，这些模拟尽可能准确地代表了给定实验的条件，包括当初胶囊的计量，胶囊表面粗糙度和冰层缺陷（作为种子生长的种子）。水动力不稳定性。可以对这些仅用于胶囊的模拟中使用的辐射驱动进行调整，以很好地重现所测得的内爆时间，运动学和低模不对称性。为了尽可能精确地模拟实验，还进行了有限数量的全三维内爆模拟。尽管付出了巨大的努力来整合所有已知的和被认为对确定内爆性能很重要的影响，但实验和模拟之间仍然存在实质性的产量差异。讨论了可以解决此差异的一些可能的替代方案和效果。

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