Generic Processes & Materials - Workplan 2026

Version 1.1

• Reverse MC
  • Work on a RMC example coupling Reverse and Biasing framework (for force interaction in target volume).
• Geometry-based biasing
  • Investigate overlap between generic and geometrical biasing.
• Generic Biasing
  • Upgrade biasing examples, and continue adding tests to geant-val (second half of 2026)
  • Design document for DXTRAN & prototyping
  • Design document for Charged particle occurrence biasing & prototyping
  • Biasing for AtRest case
  • Design document for Implicit capture & implementation
• Fast simulation
  • Revision / classical models:
    • Continuation of revision & improvements of GFlash models
    • Updates of GFlashA code and finishing of GFlashB example
  • Refine detailed vs fast simulation comparison/validation tests into geant-val
  • AI-based fast simulation model
    • Improvements to the Par04 example brought from the experience of implementation for the experiments that could benefit other Geant4 users
    • Work on adding testing (unit, integration, regression) within the fast sim tools
    • Introduction of optional and GPU-enabled tests for ML inference
    • Implementation of per-event batching
    • Development of high-granularity CaloDiT-2 (in view of CMS)
    • Studies of step-level shower data for preparation of point-cloud representations
• Phase Space Information Storage (TBC)
  • Issue a Working Paper (WP) to the Genproc Working Group and ESA TEC-EPS discussing phase-space (PS) information storage and use:
    • Discuss previous ESA work
    • Develop use-cases
    • Particle PS parameters to be recorded
    • Proposed technical solution for implementation
  • After first iteration of WP, seek wider input (G4 Event) if needed
  • Following agreement, commence implementation
• Scoring and usability
  • Maintaining parallel world scoring (including G4ParallelWorldProcess and related classes)
• Materials
  • Maintenance of material category