Preheat in laser-driven experiments can have negative impacts on inertial confinement fusion (ICF) and hydrodynamic experiments. While many groups employ the use of dopants to reduce or block preheat, direct quantification has not previously been explored. We developed a planar platform and a series of ablator targets to measure the electron and x-ray spectra generated by laser-plasma interactions with a direct drive using OMEGA-60. By comparing both thin ablators (75m) and thick ablators (270 m) that were either pure CH, 3% Si doped or 3% I doped, we were able to measure differences in electron and x-ray spectra. In addition, we observed the preheat growth of tracer layers and observed reductions in the growth with different materials. We find that iodine or a thin gold layer is the best at tamping the direct-drive preheat at OMEGA, but that the growth is still significant.

激光驱动实验中的预热会对惯性约束聚变（ICF）和流体动力学实验产生负面影响。尽管许多小组使用掺杂剂来减少或阻止预热，但以前尚未探索直接定量。我们开发了一个平面平台和一系列消融靶材，以通过使用OMEGA-60的直接驱动来测量由激光-等离子体相互作用产生的电子和X射线光谱。通过比较纯CH，3％Si掺杂或3％I掺杂的薄型烧蚀器（75m）和厚型烧蚀器（270 m），我们能够测量电子光谱和X射线光谱的差异。此外，我们观察到示踪剂层的预热生长，并观察到不同材料的生长减少。我们发现碘或薄薄的金层最适合捣固OMEGA的直接驱动式预热，