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May 8 – 12, 2023
Norfolk Waterside Marriott
US/Eastern timezone

Full Simulation of CMS for Run-3 and Phase-2

May 11, 2023, 12:30 PM
Hampton Roads Ballroom VI (Norfolk Waterside Marriott)

Hampton Roads Ballroom VI

Norfolk Waterside Marriott

235 East Main Street Norfolk, VA 23510
Oral Track 3 - Offline Computing Track 3 - Offline Computing


Srimanobhas, Phat


In this contribution we report status of the CMS Geant4 simulation and the prospects for Run-3 and Phase-2.
Firstly, we report about our experience during the start of Run-3 with Geant4 10.7.2, the common software package DD4hep for geometry description, and VecGeom run time geometry library. In addition, FTFP_BERT_EMM Physics List and CMS configuration for tracking in magnetic field have been utilized. For the first time, for the Grid mass production of Monte Carlo, this combination of components is used.
Further simulation improvements are under development targeting Run-3 such as the switch to the new Geant4 11.1 in production, that provides several features important for the optimization of simulation, for example the new transportation process with built-in multiple scattering, neutron general process, custom tracking manager, G4HepEm sub-library, and others.
We will present evaluation of various options, validation results, and the final choice of simulation configuration for 2023 production and beyond. The performance of the CMS full simulation for Run-2 and Run-3 will also be discussed.
CMS development plan for the Phase-2 Geant4 based simulation is very ambitious, and it includes a new geometry description, physics, and simulation configurations. The progress on new detector descriptions and full simulation will be presented as well as the R&D in progress to reduce compute capacity needs.
Finally, the status of the R&D for using Celeritas and Adept GPU prototypes in CMSSW will be presented.

Consider for long presentation Yes

Primary authors

Ivantchenko, Vladimir (CERN & Princeton University) Dr Banerjee, Sunanda (Wsconsin University) Dr Piparo, Danilo (CERN) Dr Krammer, Natascha (HEPHY, Austria) Mr Hahnfeld, Jonas (CERN) Dr Muzaffar, Malik Shahzad (CERN)

Presentation materials

Peer reviewing