30th Geant4 Collaboration Meeting

20 Oct 2025, 08:00 → 24 Oct 2025, 18:00 US/Eastern

301 (Charles B. Wang Center)

Alberto Ribon (CERN), Benjamin Morgan (University of Warwick (GB))

The 30th Geant4 Collaboration Meeting is held at Stony Brook University, New York, U.S.A. from October 20th to 24th, 2025. The event is restricted to members and contributors of the Geant4 Collaboration and to guests invited by the Steering Board.

The venue of the Collaboration Meeting is the Charles B. Wang Center.

The meeting also incorporates the 65th Geant4 Technical Forum on Thursday 23rd October at 9:00 EDT (15:00 CEST).

Monday 20 October

Registration

Plenary: Opening Addresses and Open Requirements

Conveners: Alvaro Tolosa-Delgado (CERN), Krzysztof Genser (Fermi National Accelerator Laboratory (US))

1 Hosts Opening Remarks

2 Spokes Opening Remarks

3 Open and new requirements - LHC and other HEP Energy Frontier experiments

Speaker: Marilena Bandieramonte (University of Pittsburgh (US))

4 Open and new requirements - HEP intensity and cosmic frontier experiments

Speaker: Krzysztof Genser (Fermi National Accelerator Laboratory (US))

5 Open and new requirements - Nuclear Physics experiments

Speaker: Luis Gerardo Sarmiento Pico

Pico_2025_G4_NP_UserRequirements.pdf

6 Open and new requirements - Medical and biological science

Speaker: Susanna Guatelli

7 Open and new requirements - Space science and engineering

Speaker: Giovanni Santin

10:30 break

Plenary: Collaboration matters I

Conveners: Alberto Ribon (CERN), Benjamin Morgan (University of Warwick (GB))

8 Status of the 4th general paper

Speaker: Andrea Dell'Acqua (CERN)

9 Integration/Deprecation of features in the Geant4 Toolkit

Over the years Geant4 has integrated a wide range of features, capabilities, and examples. Many of these are now unmaintained or otherwise obsolete. A proposal is made for future integration, deprecation and removal of features to ensure the quality of the toolkit is maintained and is sustainable over the lifetimes required by its major stakeholders.

Speaker: Benjamin Morgan (University of Warwick (GB))

10 Forming the Kernel Working Group

In 2023, the Geant4 Evolution Task Force recommended that the collaboration consider merging several smaller working groups concerned with core or "kernel" functionality into one in order to increase coherence of roles, and to better engage developers and the collaboration. With 2026 being an election year, it is the optimum time to undertake this proposal, and an outline of the structure and organisation of a "Kernel Working Group" is outlined.

Speaker: Benjamin Morgan (University of Warwick (GB))

11 Request to add custom physics models in G4PhysicsModelCatalog

Speaker: Alberto Ribon (CERN)

12:30 lunch break

Plenary: Tools

Conveners: Benjamin Morgan (University of Warwick (GB)), Seth Johnson (Oak Ridge National Laboratory (US))

15:30 break

Plenary: t.b.d.

Reception

Tuesday 21 October

Plenary: Basic, Extended and Advanced Examples

Conveners: Francesco Romano (Universita & INFN, Bari), Ivana Hrivnacova (Université Paris-Saclay (FR))

12 Extended Examples: General overview and WP status

Speaker: Ivana Hrivnacova (Université Paris-Saclay (FR))

13 New dna radial and phasespace examples

Speaker: Sebastien Incerti (CNRS/IN2P3)

14 New dna microtrack example

Speaker: Dr Miguel Antonio Cortes-Giraldo (Universidad de Sevilla)

15 Recent Updates and Future Developments on Hadrontherapy and Radiobiology example

Speaker: Alberto Sciuto

16 Advanced Examples: General overview and WP status

Speaker: Francesco Romano

17 Update about the example on use of IAEAphsp files

Speaker: Dr Miguel Antonio Cortes-Giraldo (Universidad de Sevilla)

18 Minibeam dosimetric studies using the eFLASH_radiotherapy and exp_microdosimetry examples

Speaker: Giuliana Milluzzo

19 General discussion

10:30 break

Plenary: Geometry

Conveners: Andrei Gheata (CERN), John Apostolakis (CERN)

20 Update on VecGeom modellers

Speaker: Andrei Gheata (CERN)

21 Update on ORANGE modeller

Speaker: Seth Johnson (Oak Ridge National Laboratory (US))

12:30 lunch break

Plenary: Kernel, Generic Processes and Materials

Conveners: Igor Semeniouk (Centre National de la Recherche Scientifique (FR)), Makoto Asai, Marc Verderi (Centre National de la Recherche Scientifique (FR)), Pedro Arce (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))

22 The mechanism of G4VTrackingManager and its usage for GPU code

Speaker: Jonas Hahnfeld (CERN & Goethe University Frankfurt)

23 Updates on kernel

Speaker: Makoto Asai

24 Status of Reverse MC and usage in GRAS

Speaker: Dr Laurent Desorgher (IRA CHUV)

25 Status of channeling

Speaker: Alexei Sytov (Universita e INFN, Ferrara (IT))

15:30 break

Parallel 1: Hadronic physics

Conveners: Alberto Ribon (CERN), Luis Gerardo Sarmiento Pico

Vis driver features

26 New method to make XS data library for neutrons

Speakers: Alexei Berngartd, Prof. Vladimir Ivantchenko (CERN)

27 Validation of Geant4 fragmentation models for hadrontherapy beyond carbon ions

Speaker: Kristie Moore (University Wollongong, Australia)

28 Development of IAEA cross sections modelling isotope production from protons, for medical physics applications

Speaker: Ilan Eliyauh

29 Determination of simulation parameter values for Light-Ion QMD

Speaker: Yoshihide Sato

Parallel 2: Parallel-World brain-storming

Conveners: Dr Gabriele Cosmo (CERN), Makoto Asai

Wednesday 22 October

Parallel 1: Electromagnetic Physics

Conveners: Sebastien Incerti (CNRS/IN2P3), Tran Hoang (CNRS, France)

Vis driver features

30 Development of Geant4-DNA functionality in the physical and chemical stage for radiation protection in space

Speaker: Jay Archer (University of Wollongong)

31 Ion transport in Geant4-DNA

Speaker: Matvei Vologzhin (Tomsk State University (RU))

32 Monte Carlo method for the angular distribution of the e−e+ pair created in the µ-nucleus collision

Speaker: Gerardo Depaola

Parallel 2: Visualisation

Conveners: John Allison, Joseph Perl

10:30 break

Plenary: Electromagnetic physics

Conveners: Fada Guan, Prof. Vladimir Ivantchenko (CERN)

33 EM physics status for 11.4 and beyond

Speaker: Prof. Vladimir Ivantchenko (CERN)

34 The automatisation of the execution of the G4-Med tests

Speaker: Carlo Mancini Terracciano

35 Status of Geant4-DNA

Speaker: Sebastien Incerti (CNRS/IN2P3)

36 Progress for simulation of chemistry

Speaker: Tran Ngoc Hoang (IN2P3)

12:30 lunch break

Plenary: Computing performance

Conveners: Julia Yarba, Soon Yung Jun (FNAL)

37 Update and Plan of G4CPT

Speaker: Julia Yarba

38 CMS/[ATLAS]

Speaker: Prof. Vladimir Ivantchenko (CERN)

39 Computing Performance of Geant4 Medical Applications

Speaker: Dr Miguel Antonio Cortes-Giraldo (Universidad de Sevilla)

40 ePIC Detector Simulation at Scale

Speaker: Maxim Potekhin (Brookhaven National Laboratory (US))

41 Computing Performance Profiling and Geant4 simulation Activities at IBS

Speaker: Kihong Park (IBS)

15:30 break

Plenary: Visualization

Conveners: John Allison, Joseph Perl

Banquet

Thursday 23 October

Technical Forum

Session details of Technical Forum are given in the dedicated Technical Forum Indico page.

10:30 break

Technical Forum

Session details of Technical Forum are given in the dedicated Technical Forum Indico page.

12:30 lunch break

Plenary: R&D

Conveners: Marc Verderi (Centre National de la Recherche Scientifique (FR)), Seth Johnson (Oak Ridge National Laboratory (US))

42 AdePT

Speaker: Severin Diederichs (CERN)

43 Celeritas

Speaker: Seth Johnson (Oak Ridge National Laboratory (US))

44 AI/ML?

15:30 break

Plenary: Hadronic physics

Conveners: Alberto Ribon (CERN), Luis Gerardo Sarmiento Pico

45 Status of Hadronic Physics

Speaker: Alberto Ribon (CERN)

46 Developments for pre-compound model and de-excitation module

Speakers: Nikita Chalyi, Prof. Vladimir Ivantchenko (CERN)

47 Update on Fluka-Cern

Speaker: Gabrielle Hugo (CERN)

Friday 24 October

Plenary: Documentation and Collaboration matters II

Conveners: Alexander Howard (Imperial College (GB)), Luis Gerardo Sarmiento Pico

10:30 break

Plenary: Further discussion and Closeout

Conveners: Alberto Ribon (CERN), Benjamin Morgan (University of Warwick (GB))

Steering Board meeting