Chen Hui, Woods D T, Farmer W A, Aybar N A, Liedahl D A, MacLaren S A, Schneider M B, Scott H A, Hinkel D E, Landen O L, Moody J D, Rosen M D, Ross J S, Rogers S, Roskopf N, Swadling G F, Vonhof S
<a href="https://ror.org/041nk4h53">Lawrence Livermore National Laboratory</a>, Livermore, California 94550, USA.
Phys Rev E. 2024 Jul;110(1):L013201. doi: 10.1103/PhysRevE.110.L013201.
The predicted implosion performance of deuterium-tritium fuel capsules in indirect-drive inertial confinement fusion experiments relies on precise calculations of the x-ray drive in laser-heated cavities (hohlraums). This requires accurate, spectrally dependent simulations of laser to x-ray conversion efficiencies and x-ray absorption losses to the hohlraum wall. A set of National Ignition Facility experiments have identified a cause for the long-standing hohlraum "drive deficit" as the overprediction of gold emission at ∼2.5 keV in nonlocal thermodynamic equilibrium coronal plasma regions within the hohlraum. Reducing the emission and absorption opacity in this spectral region by ∼20% brings simulations into agreement with measured x-ray fluxes and spectra.
在间接驱动惯性约束聚变实验中，氘 - 氚燃料胶囊的预测内爆性能依赖于对激光加热腔（黑体腔）中X射线驱动的精确计算。这需要对激光到X射线的转换效率以及X射线向黑体腔壁的吸收损失进行准确的、与光谱相关的模拟。一组国家点火设施实验已经确定了长期存在的黑体腔“驱动不足”的一个原因，即黑体腔内非局部热力学平衡日冕等离子体区域中约2.5keV处金发射的预测过高。将该光谱区域的发射和吸收不透明度降低约20%可使模拟结果与测量的X射线通量和光谱相符。
