Orateur
Description
We present a framework for generating lightcone simulations optimized for Stage-IV cosmic shear analyses using Higher-Order Statistics (HOS). We revisit and improve key design choices from previous simulation campaigns, assessing their impact under survey conditions representative of 10 years of LSST observations. We show that uniform spacing in scale factor provides better accuracy than standard redshift- or distance-based schemes, and that high mass resolution is essential for robustly modeling HOS. In particular, simulations with $2048^3$ particles accurately reproduce all statistics while allowing a reduced number of lightcone shells with negligible loss of precision, significantly lowering computational costs. We also demonstrate that particle densities at high redshift can be substantially downsampled without affecting observables. These results provide practical guidance for future forward-modeling and emulator analyses of Stage-IV weak-lensing data.