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We present the Sejong Suite, an extensive collection of state-of-the-arthigh-resolution cosmological hydrodynamical simulations spanning a variety ofcosmological and astrophysical parameters, primarily developed for modeling theLyman-Alpha (LyA) forest. The suite is organized into three main categories(Grid Suite, Supporting Suite, and Systematics Suite), addressing differentscience targets. Adopting a particle-based implementation, we follow theevolution of gas, dark matter (cold and warm), massive neutrinos, and darkradiation, and consider several combinations of box sizes and number ofparticles. With additional enhancing techniques, we are able to reach anequivalent resolution up to 3x3328^3=110 billion particles in a (100 Mpc/h)^3box size, ideal for current and future surveys (e.g., eBOSS, DESI). Noticeably,for the first time, we simulate extended mixed scenarios describing thecombined effects of warm dark matter, neutrinos, and dark radiation, modeledconsistently by taking into account the neutrino mass splitting. In addition toproviding multicomponent snapshots from z=5.0 to z=2.0 in intervals of dz=0.2for all of the models considered, we produced over 288 million LyA skewers inthe same z-range and extended parameter space. The skewers are well suited forLyA forest science studies, for mapping the high-$z$ cosmic web and thematter-to-flux relation and bias, and for quantifying the critical role ofbaryons at small scales. We also present a first analysis of the suite focusedon the matter and flux statistics, and show that we are able to accuratelyreproduce the 1D flux power spectrum down to scales k=0.06 [s/km] as mapped byrecent high-resolution quasar data, as well as the thermal history of theintergalactic medium. The simulations and products described here will beprogressively made available.

The Sejong Suite: Cosmological Hydrodynamical Simulations with Massive Neutrinos, Dark Radiation, and Warm Dark Matter