The 9th International Conference on Matter and Radiation at Extremes (ICMRE2026) ( ICMRE2026)

   In laser-driven Inertial Confinement Fusion (ICF), laser ablation is central to key physical processes, including laser-to-X-ray conversion and fuel capsule ablation. To elucidate the underlying dynamics, this study investigated the time-resolved X-ray emission spectra from tracer layers embedded in low-Z materials. By integrating radiation-hydrodynamic simulations with X-ray spectral modeling, we analyzed the temporal evolution of the temperature and the spatial behavior of the tracer layer during ablation. The influence of radiation effects on the temperature history of the tracer layer was also examined. Our results demonstrate that the medium-Z tracer material titanium (Ti), while functioning as a temperature diagnostic, also modifies the ablation timeline and heating history of the low-Z material due to its higher atomic number. This work provides a detailed analysis of ablation dynamics in CH targets and clarifies the impact of medium-Z tracer materials on the ablation process. The findings offer valuable insights for optimizing ICF target designs.