The Marble campaign on the National Ignition Facility investigates the effect of heterogeneous mix on thermonuclear burn for comparison to a probability distribution function (PDF) burn model. Marble utilizes plastic capsules filled with deuterated plastic foam and a fill gas containing tritium. As the capsules implode, the deuterium in the foam mixes with the tritium gas, and DT neutrons are produced as the shocks compress and heat the mixture. The yield of DT neutrons is dependent on the uniformity of the mix, with more heterogeneous mix producing fewer neutrons. In Marble, the heterogeneity of the mix is controlled by varying the diameter of voids introduced into the foam. The first NIF Marble campaign has been executed in which the Marble capsules were indirectly driven with a single strong shock using NIF hohlraums. The experiments produce a low-convergence, high-ion-temperature implosion. The ratio of DT to DD neutron yield is largely consistent with uniform atomic mix for fine-pore foam, and increases slightly with void diameter, contrary to 1D simulations using the PDF burn model. Recent 3D high-resolution simulations of similar experiments performed on the Omega Laser Facility suggest an explanation.

国家点火设施的大理石运动调查了异质混合物对热核燃烧的影响，以与概率分布函数（PDF）燃烧模型进行比较。Marble利用填充有氘化塑料泡沫和包含tri的填充气体的塑料胶囊。当胶囊爆炸时，泡沫中的氘与the气混合，并且当冲击压缩并加热混合物时会产生DT中子。DT中子的产量取决于混合物的均匀性，更多的非均质混合物产生的中子更少。在大理石中，通过改变引入泡沫中的空隙的直径来控制混合物的不均匀性。第一个NIF Marble运动已经执行，其中使用NIF hohlraums通过一次强烈冲击间接驱动Marble胶囊。实验产生了低会聚，高离子温度内爆。DT与DD中子产率的比率在很大程度上与细孔泡沫的均匀原子混合相符，并且随空隙直径的增加而略有增加，这与使用PDF燃烧模型进行的一维模拟相反。最近在Omega Laser Facility上进行的类似实验的3D高分辨率模拟提出了一种解释。