SCIDAC 128 SG5
64-member hydrodynamic suite in a 128 Mpc/h box varying five subgrid parameters on a Latin hypercube at fixed cosmology.
When to use: Studying how subgrid-physics choices affect halo and galaxy properties across the parameter sweep.
Key facts
| Property | Value |
|---|---|
| Box size | 128 Mpc/h |
| Dark matter particles | 5123 |
| Initial baryon particles | 5123 |
| Dark matter mass resolution | 1.13 × 109 Msun/h |
| Initial baryon mass resolution | 2.12 × 108 Msun/h |
| Suite members | 64 |
Snapshot steps
| Step | Redshift |
|---|---|
| 624 | z = 0.0 |
| 567 | z = 0.1 |
| 415 | z = 0.5 |
| 310 | z = 1.0 |
| 205 | z = 2.0 |
Access
Access requires membership in the OpenCosmoALCF Globus group.
Membership requests can be submitted from each group's page in the Globus Groups web interface.
About this dataset
SCIDAC 128 SG5 is the 64-member Phase-1 CRK-HACC calibration suite. Every member evolves 2 × 5123 dark-matter and initial baryon tracers in a 128 Mpc/h box with the same realization of a fixed Planck-like cosmology. This common realization controls cosmic sample variance across the ensemble, although the subgrid prescriptions themselves remain stochastic.
Five quantities vary across a symmetric Latin hypercube: wind-velocity scaling, wind energy, black-hole seed mass, kinetic-feedback velocity, and kinetic-feedback efficiency. The symmetric design distributes the 64 samples across the five-dimensional parameter space while balancing each parameter about the design center.
At z = 0, 0.1, 0.5, 1, and 2, the portal exposes halo catalogs, spherical-overdensity profiles, halo particles, galaxy catalogs, merger-offset selections, and HAvoCC analyses. The associated emulator study used the z = 0 suite outputs to calibrate against the galaxy stellar mass function, cluster gas-density profiles, and cluster gas fractions. One registry entry addresses the full suite; query parameters select or aggregate its members.