2025 Milestones

ELECTROMAGNETIC WORKING GROUP

Plan of activity for 2025. (1) - developments for 11.4beta (June 2025) (2) - developments for 11.4 (December 2025)

1) Infrastructure and general support for EM physics

  • Perform regular execution and regression analysis using existing testing suites. (1)/(2)
  • Maintenance of EM libraries. (1)/(2)
  • Provide parallel initialisation of EM physics. (2)
  • Provide option to enable/disable fluctuations per G4Region (ATLAS request). (1)
  • Delta assessment of R&D on GPU end of March. (1)

2) Extended functionality of G4HepEm package

  • Configuration per detector region: e.g. provide the possibility to use different MSC stepping in different detector region (as used by CMS). (1)
  • Add the missing gamma- and lepto-nuclear cross section and implement connection layer for tracks from G4HepEm to native Geant4 tracking for sampling of final state of nuclear processes. (1)
  • Implement the “general process“ like handling of the macroscopic cross sections. (1)
  • Implement the possibility of Woodcock tracking of gamma photons. (1)
  • Extend and optimize tracking algorithms per particle type. (2)
  • Validate developed library for ATLAS and CMS. (1)/(2)
  • Maintain the entire physics on GPU for AdePT GPU based EM shower simulation R&D project. (1)/(2)

3) Developments for LHC and other HEP experiments

  • Experimental validation and update of G4ChannelingFastSimModel, G4BaierKatkov and G4CoherentPairProduction models. (2)
  • Implementation of new examples of applications in oriented crystals including crystalline undulator and positron source. (1)
  • Implementation of a ML model trained on Particle-in-Cell simulations of laser-driven plasma wake field acceleration. (2)
  • Development methods for simulation of inverse Compton scattering. (2)
  • Provide an option to use EPICS-2017 data for Compton scattering. (1)
  • Validate new 5D generators for muon pair production. (1)/(2)
  • Validate 3-gamma annihilation models for different EM physics lists. (1)/(2)
  • Integration of polarization and quantum entanglement effects in cascade gammas and π0 decay gammas. (2)

4) Updates of low-energy EM models

  • Extended Microelec code for additional materials. (2)
  • Investigations of models mor ion-plasma stopping powers. (2)
  • Maintenance and refinement of polarised/non-polarised Compton models (1)/(2)

5) G4-Med developments

  • Validation of EM and hadronic models for medical applications. (1)/(2)

6) Optical photon and X-ray physics

  • Maintenance and optimisation of optical classes. (1)/(2)
  • Introduce model approach into Cerenkov, Scintillation, and WLS processes, which will be activated for logical volumes. (1)
  • Allow specification of border surfaces by material or logical volume. (1)
  • Implement a new Cerenkov model valid for thin materials. (2)
  • A new extended example based on publication ion Cerenkov spectrometer. (1)
  • Introduce spline fitting to the spectra inputs for optical physics. (2)
  • Complete the X-ray Bragg reflection on a cylindrical lens. (2)
  • Implement medium with photons and thermal-photon inverse Compton scattering inside TestEm16. (1)
  • Implementation of an extended example to illustrate the use of the Inverse Compton Scattering event generator. (2)
  • Implementation of X-ray refraction processes.

7) DNA physics and chemistry developments

  • Improve DNA physics models for ions. (1)/(2)
  • Integrate of a new models for Li ions (UCSF team) (2)
  • Carbon ions implementation in Geant4-DNA. (2)
  • Study of optimal energy overlap between G4-DNA RPWBA and Born model. (1)/(2)
  • Development of the physics and physic-chemical stage for e- and e+ interactions with gaseous N2, O2, CO2. (1)/(2)
  • Update the chemistry module: IRT-syn model and mesoscopic model. (2)
  • Remove dependence of DNA sub-library from analysis sub-library. (1)
  • Human normal and malignant cell irradiations with different ion species in order to estimate RBE dependence on LET and valuation of DNA DSB followed as a function of post-irradiation time. Obtained results in vitro will be compared with numerical simulations. (1)/(2)
  • Implementing molecular excitation cross-section model and validation. (1)/(2)
  • Continue developments on combined Physics Lists mixing G4DNA, standard EM, and hadronic physics. Prepare the default DNA physics constructor. (1)/(2)
  • Implementation of cellular oxygen chemistry in G4DNA chemistry options. (2)
  • Validation of physics list for radiation dosimetry standards in metrology field. (2)
  • Implementation of the Relativistic Option 4 electron inelastic model. (2)
  • Benchmarking simulations using the relativistic version of DNA_Option4 as inelastic with ELSEPA elastic model and comparison with Uehara elastic model. (1)/(2)
  • Benchmarking and validation of the new inelastic models for gold material within the relativistic plane wave Born approximation up to 1 MeV. (1)/(2)
  • Radio enhancement studies for gold nanoparticles with the newly developed dielectric relativistic models for gold. (2)
  • Prototype of software for the simulation of water radiolysis under multi-pulse irradiation. (2)