Stefano Tognini

Currently `RootPrimaryGenerator` is in `phys/`, but maybe should be moved to `io/` which is where `RootEventWriter/Reader` are?

> The word clumped has an unpleasant feel to it Totally agree. Somehow it felt like 'merged' was a bit off, and 'concatenated' was long... But I guess merged is...

Here is the test I currently have. Celeritas is showing slightly larger differences. Plot details: - G4 v10.7.2; binning was not changed - 100k primaries, 1mm threshold cuts for all...

Just ran a short test on Summit. The input, cpu run script, and results are in [benchmarks/testem3-demo-loop/g4app-summit/](https://github.com/celeritas-project/benchmarks/tree/master/testem3-demo-loop/g4app-summit), but here is the gist of it: | Spline | Avg. wall time...

No worries. Everything was looking great, so was just having a final look in case I spotted any minor detail after yesterday's commits. Thanks a lot @drbenmorgan !

From the discussion with Laura Paulucci: - DUNE's fast optical simulation is handled in LArSoft via [larsim/PhotonPropagation](https://github.com/LArSoft/larsim/tree/develop/larsim/PhotonPropagation). This is the workflow on a production-like scenario, with a particle depositing energy...

# Physics cycle - Physical interaction times ```mermaid flowchart LR mu[Muon] --"10^{-12} - 10^{-13} s"--> muatom["Atom formation"] muatom --"10^{-8} - 10^{-10} s"--> molecule["Molecule formation"] molecule --"10^{-12} s"--> Fusion ``` -...

Here is my output: ``` $ sw_vers ProductName: macOS ProductVersion: 15.0 BuildVersion: 24A335 $ clang --version Apple clang version 16.0.0 (clang-1600.0.26.3) Target: arm64-apple-darwin24.0.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin $ ls...

Sure: ``` $ ls -l /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/ total 0 drwxr-xr-x 7 root wheel 224 Sep 14 13:16 MacOSX.sdk lrwxr-xr-x 1 root wheel 10 Sep 17 09:08 MacOSX15.0.sdk -> MacOSX.sdk lrwxr-xr-x 1...