28th Geant4 Collaboration Meeting
Room A
Hokkaido University
We are really pleased to hold the 28th Geant4 Collaboration Meeting in Hokkaido University !
The meeting (Monday through Friday) will be run in parallel of the medical tutorial (Tuesday through Thursday). They will share a common Technical Forum on Thursday. The Collaboration meeting format is oherwise pretty standard; the agenda content will be evolved during the coming weeks. This page itself will provide news on the meeting organization.
Please note this is a closed Geant4 meeting, reserved to Geant4 members or to people having received an explicit invitation by the Collaboration.

Any questions or requests should be addressed to g4cm2023[at]ml.post.kek.jp (please replace "[at]" by "@", this is to minimize spams).
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8:00 AM
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9:00 AM
Registration
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9:00 AM
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10:30 AM
Plenary 1 - Opening addresses / open requirements Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Alberto Ribon (CERN), Alexei Sytov (Universita e INFN, Ferrara (IT))-
9:00 AM
Welcome and opening remarks 15mSpeakers: Dr Taeko Matsuura (Hokkaido University), Takashi Sasaki (High Energy Accelerator Research Organization (JP))
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9:15 AM
Introduction to the Collaboration Meeting 15mSpeaker: Marc Verderi (Centre National de la Recherche Scientifique (FR))
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9:30 AM
HEP requirements 15mSpeakers: Lorenzo Pezzotti (CERN), Marilena Bandieramonte (University of Pittsburgh (US))
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9:45 AM
Medical and bio-science requirements 15mSpeaker: Susanna Guatelli
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10:00 AM
Nuclear physics requirements 15mSpeaker: Luis Gerardo Sarmiento Pico
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10:15 AM
Open and new requirements: HEP intensity and cosmic frontier experiments 15mSpeaker: Krzysztof Genser (Fermi National Accelerator Laboratory (US))
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9:00 AM
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10:30 AM
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11:00 AM
Break 30m Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111 -
11:00 AM
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12:30 PM
Plenary 2 - Collaboration tools Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Benjamin Morgan (University of Warwick (GB)), Lorenzo Pezzotti (CERN)-
11:00 AM
Geant4 Development Status and Updates 25mSpeaker: Benjamin Morgan (University of Warwick (GB))
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11:25 AM
Geant-Val Status and Updates 25mSpeakers: Dmitri Konstantinov (University of Virginia (US)), Lorenzo Pezzotti (CERN)
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11:50 AM
Geant4 Web Presence Status and Updates 20mSpeaker: Benjamin Morgan (University of Warwick (GB))
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12:10 PM
Free Discussion 20m
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11:00 AM
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12:30 PM
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2:00 PM
Lunch break 1h 30m Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111 -
2:00 PM
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3:30 PM
Parallel 1A: New EM developments Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Convener: Jonas Hahnfeld (CERN)-
2:00 PM
X-Ray reflection process 15mSpeaker: Helmut Burkhardt (Albert Ludwigs Universitaet Freiburg (DE))
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2:15 PM
Development of new low energy EM models to describe ionisation in the atmosphere 15mSpeaker: francesca nicolanti
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2:30 PM
Geant4 channeling and Baier-Katkov models and their applications in accelerator physics, particle physics and space science 15mSpeaker: Alexei Sytov (Universita e INFN, Ferrara (IT))
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2:45 PM
Latest development of the quantum entangled simulation of the annihilation gammas in Geant4 15mSpeaker: Julien Bordes
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3:00 PM
Activities and EM developments at LNS Catania 15mSpeakers: Pablo Cirrone (Unknown), Serena Fattori
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3:15 PM
Discussion on EM bug reports and problems 15mSpeaker: Prof. Vladimir Ivantchenko (CERN)
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2:00 PM
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2:00 PM
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3:30 PM
Parallel 1B: Generic Processes & Materials Hokkaido University (Room B)
Hokkaido University
Room B
Convener: Marc Verderi (Centre National de la Recherche Scientifique (FR))-
2:00 PM
Updates on Par04 and fast simulation 30mSpeakers: Anna Zaborowska (CERN), Dalila Salamani (CERN)
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2:30 PM
Progress with using geant-val 15mSpeaker: Igor Semeniouk (Centre National de la Recherche Scientifique (FR))
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2:45 PM
Update on command-based scorers (TBC) 20mSpeaker: Makoto Asai (Jefferson Lab, US)
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3:05 PM
Discussion time 25m
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2:00 PM
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3:30 PM
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4:00 PM
Break 30m Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111 -
4:00 PM
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5:30 PM
Plenary 3: Feed-back on Collaboration Evolution Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Jonas Hahnfeld (CERN), Marc Verderi (Centre National de la Recherche Scientifique (FR))-
4:00 PM
Introduction 10mSpeakers: Jonas Hahnfeld (CERN), Marc Verderi (Centre National de la Recherche Scientifique (FR))
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4:10 PM
Report from Evolution Task Force (includes 15' discussion time) 40mSpeaker: Anna Zaborowska (CERN)
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4:50 PM
Report from Early Career Researchers Committee (ECRC) (includes 15' discussion time) 25mSpeaker: Lorenzo Pezzotti (CERN)
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5:15 PM
General Discussion 15m
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4:00 PM
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5:30 PM
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7:30 PM
Welcome cocktail 2h Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111
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8:00 AM
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9:00 AM
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8:00 AM
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12:10 PM
Medical tutorial: Registration & lectures (L01, L02, L03, L04, H02)
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9:00 AM
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10:30 AM
Parallel 2A: Basic, Extended and Advanced Examples Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Ivana Hrivnacova (Université Paris-Saclay (FR)), Susanna Guatelli-
9:00 AM
Extended example: analysis/AnaEx03 5mSpeaker: Ivana Hrivnacova (Université Paris-Saclay (FR))
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9:05 AM
Extended example: medical/dna/jetcounter 5mSpeakers: Beata Brzozowska (University of Warsaw), Hoang Ngoc Tran (CENBG/CRNS), Hoang Tran
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9:10 AM
Extended example: medical/dna/dnadamage2 5mSpeakers: Dominguez Kondo Naoki (UCSF), Hoang Ngoc Tran (CENBG/CRNS), Hoang Tran
- 9:15 AM
- 9:20 AM
- 9:25 AM
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9:35 AM
Advanced examples: eFlash_radiotherapy and radioprotection 10mSpeaker: Giuliana Miluzzo (INFN Catania)
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9:45 AM
New space physics examples derived from ATHENA telescope 10mSpeaker: Ronny Stanzani
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9:55 AM
A PoC for a graphical Geant4 Interface and simulation management: potential users and possibilities 10mSpeaker: Dr Alfonso Mantero (Swhard srl)
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10:05 AM
Status of IAEAphsp example 10mSpeaker: MIGUEL ANTONIO CORTES GIRALDO Not Supplied
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10:15 AM
Geant4 teaching/learning opportunities 15mSpeaker: Benjamin Morgan (University of Warwick (GB))
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9:00 AM
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9:00 AM
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10:30 AM
Parallel 2B: Geometry Working Session Hokkaido University (Room B)
Hokkaido University
Room B
Talks (updates, status), discussions and working sessions
Conveners: Dr Gabriele Cosmo (CERN), John Apostolakis (CERN)-
9:00 AM
QSS: status / update 20m
- Status: first release in 11.2-beta
- update: recent improvements / fixes
- topics for 11.2 (Dec): remaining issues/challenges
- outlook
Speakers: Lucio Santi (Universidad de Buenos Aires), Rodrigo Castro (ETH Zurich), Rodrigo Daniel Castro (Universidad de Buenos Aires (AR)) -
9:20 AM
VecGeom - developments / plans 20mSpeakers: Andrei Gheata (CERN), Juan Gonzalez Caminero
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9:40 AM
Orange modeller: update 20mSpeaker: Seth Johnson (Oak Ridge National Laboratory (US))
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10:00 AM
Geometry Converter: an update 15mSpeaker: Guilherme Lima (FermiLab (US))
- 10:15 AM
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9:00 AM
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10:30 AM
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11:00 AM
Break 30m Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111 -
11:00 AM
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12:30 PM
Plenary 4: Physics I : Hadronic Physics Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Alberto Ribon (CERN), Lorenzo Pezzotti (CERN)- 11:00 AM
- 11:25 AM
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11:40 AM
Validation of Geant4 physics via calorimeter test-beam set-ups in geant-val 20mSpeaker: Lorenzo Pezzotti (CERN)
- 12:00 PM
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12:10 PM
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1:30 PM
Medical tutorial break 1h 20m
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12:30 PM
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2:00 PM
Lunch break 1h 30m
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1:30 PM
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5:30 PM
Medical tutorial: Lectures & Hands-on (L05, H02, Hands-on 1)
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2:00 PM
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3:30 PM
Parallel 3A: Hadronic 1 Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Convener: Alberto Ribon (CERN)-
2:00 PM
Development and implementation of a new Geant4 QMD model and its validation 20mSpeaker: Yoshihide Sato
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2:20 PM
Graph Neural Networks for fast emulation of nuclear interaction models 20mSpeaker: Lorenzo Arsini
- 2:40 PM
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2:00 PM
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2:00 PM
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3:30 PM
Parallel 3B: Computing Performance Hokkaido University (Room B)
Hokkaido University
Room B
Conveners: Gunter Folger, Soon Yung Jun (Fermi National Accelerator Lab. (US))-
2:00 PM
ALICE 10mSpeakers: Ivana Hrivnacova (Université Paris-Saclay (FR)), Sandro Christian Wenzel (CERN)
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2:10 PM
ATLAS 10mSpeaker: Marilena Bandieramonte (University of Pittsburgh (US))
- 2:20 PM
- 2:30 PM
- 2:40 PM
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2:50 PM
IBS/Underground Physics 10mSpeaker: Eunju Jeon (Center for Underground Physics, IBS)
- 3:00 PM
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3:10 PM
Discussion 20m
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2:00 PM
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3:30 PM
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4:00 PM
Break 30m Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111 -
4:00 PM
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5:30 PM
Plenary 5: Kernel I : Geometry, Run, Event, etc. Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Convener: Dr Gabriele Cosmo (CERN)-
4:00 PM
Status of Geometry developments 20mSpeaker: John Apostolakis (CERN)
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4:20 PM
Update on sub-event level parallelism 20mSpeaker: Makoto Asai (Jefferson Lab, US)
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4:40 PM
Status of developments on Fast Simulation 20mSpeakers: Anna Zaborowska (CERN), Dalila Salamani (CERN)
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5:00 PM
Thoughts on parallelisation of initialisation phase and open issues 20mSpeaker: Prof. Vladimir Ivantchenko (CERN)
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5:20 PM
Discussion 10m
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4:00 PM
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8:00 AM
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12:10 PM
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9:00 AM
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12:30 PM
Medical tutorial: Lectures (L06 - L11)
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9:00 AM
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10:30 AM
Plenary 6: Kernel II : GUI, Vis, Examples, etc. Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Francesca Nicolanti, Susanna Guatelli-
9:00 AM
Update on the Geant4 Documentation 10mSpeaker: Alexander Howard (Imperial College (GB))
- 9:10 AM
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9:25 AM
Geant4 Visualisation 10mSpeaker: John Allison
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9:35 AM
Update on the Geant4 Analysis 10mSpeaker: Ivana Hrivnacova (Université Paris-Saclay (FR))
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9:45 AM
Update on the Basic and Extended Examples 15mSpeaker: Ivana Hrivnacova (Université Paris-Saclay (FR))
- 10:00 AM
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10:15 AM
Geant4 learning/teaching tools 15mSpeaker: Benjamin Morgan (University of Warwick (GB))
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9:00 AM
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10:30 AM
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11:00 AM
Break 30m Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111 -
11:00 AM
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12:30 PM
Parallel 4A: Internal Communication Tools & Procedures; Publication Board Tools Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Discussion about setting-up an internal Indico for WG meeting announcements, internal minutes, etc. Discussion about web page(s) for internal notes, etc.
Review and discussion of tools used by the pub. board & related procedures (merged from parallel 5B)
Conveners: Alexander Howard (Imperial College (GB)), Benjamin Morgan (University of Warwick (GB)), Marc Verderi (Centre National de la Recherche Scientifique (FR))-
11:00 AM
Discussion 1h 30m
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11:00 AM
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11:00 AM
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12:30 PM
Parallel 4B: (free) Hokkaido University (Room B)
Hokkaido University
Room B
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12:30 PM
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2:00 PM
Lunch break 1h 30m
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12:30 PM
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2:00 PM
Medical tutorial break 1h 30m
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2:00 PM
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5:30 PM
Medical tutorial: Hands-on 2 & 3
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2:00 PM
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3:30 PM
Parallel 5A: New EM validations Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Jay Archer (University of Wollongong), Susanna Guatelli-
2:00 PM
Model of the single Coulomb scattering of e-/e+ based on numerical DCS from DPWA 15mSpeaker: Mihaly Novak (CERN)
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2:15 PM
Bragg Peak validation 15mSpeaker: MIGUEL ANTONIO CORTES GIRALDO Not Supplied
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2:30 PM
Validation of Geant4 fragmentation for incident alpha particles 15mSpeaker: David Bolst (University of Wollongong)
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2:45 PM
Modelling the Response of CLLBC(Ce) and TLYC(Ce) SiPM-Based Radiation Detectors in Mixed Radiation Fields with Geant4 15mSpeaker: Jeremy Brown
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3:00 PM
Calculation of early DNA damage in astronauts: update and future perspectives 15mSpeaker: Jay Archer (University of Wollongong)
- 3:15 PM
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2:00 PM
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2:00 PM
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3:30 PM
Parallel 5B: Visualization Hokkaido University (Room B)
Hokkaido University
Room B
Convener: Laurent Garnier -
3:30 PM
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4:00 PM
Break 30m
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4:00 PM
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5:30 PM
Plenary 7: Physics II : EM physics Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Alexei Sytov (Universita e INFN, Ferrara (IT)), Mihaly Novak (CERN)- 4:00 PM
- 4:30 PM
- 5:00 PM
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7:00 PM
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9:00 PM
Conference Dinner 2h Sapporo Beer Museum
Sapporo Beer Museum
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9:00 AM
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12:30 PM
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9:00 AM
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12:30 PM
Medical tutorial: Lectures (L12 - L14), Hand-on, Q/A & closing session
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9:00 AM
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10:30 AM
Parallel 6A: Hadronic 2 Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Convener: Alberto Ribon (CERN)-
9:00 AM
n_TOF flux validation 20mSpeaker: Dr Miguel Antonio Cortes-Giraldo (Universidad de Sevilla)
- 9:20 AM
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9:00 AM
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9:00 AM
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10:30 AM
Parallel 6B: R&D TF Hokkaido University (Room B)
Hokkaido University
Room B
Conveners: John Apostolakis (CERN), Witold Pokorski (CERN)- 9:00 AM
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9:30 AM
Celeritas progress report 30mSpeaker: Seth Johnson (Oak Ridge National Laboratory (US))
- 10:00 AM
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10:30 AM
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11:00 AM
Break 30m Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111 -
11:00 AM
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12:30 PM
Plenary 8: Future Looking Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Alberto Ribon (CERN), Jonas Hahnfeld (CERN)-
11:00 AM
Status of python interfaces to Geant4 20mSpeaker: Benjamin Morgan (University of Warwick)
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11:20 AM
Julia interface to Geant4 20mSpeakers: Benjamin Morgan (University of Warwick), Pere Mato Vila (CERN)
- 11:40 AM
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12:00 PM
On differentiable programming and Geant4 20mSpeaker: Mihaly Novak (CERN)
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11:00 AM
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12:30 PM
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2:00 PM
Lunch break 1h 30m
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2:00 PM
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3:30 PM
Technical Forum: Developers session Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Alberto Ribon (CERN), Marc Verderi (Centre National de la Recherche Scientifique (FR)), Marilena Bandieramonte (University of Pittsburgh (US))-
2:00 PM
Kernel / non-physics (status, patch 11.1.2, expected and at risk features) 20mSpeaker: Dr Gabriele Cosmo (CERN)
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2:20 PM
Hadronic physics (status, patch 11.1.2, expected and at risk features) 20mSpeaker: Alberto Ribon (CERN)
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2:40 PM
EM Physics (status, patch 11.1.2, expected and at risk features) 20mSpeakers: Mihaly Novak (CERN), Prof. Vladimir Ivantchenko (CERN)
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3:00 PM
Non-C++ interfaces to Geant4 10mSpeaker: Benjamin Morgan (University of Warwick (GB))
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3:10 PM
Geant4.jl - New Interface to Simulation Applications 15mSpeaker: Pere Mato Vila (CERN)
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2:00 PM
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3:30 PM
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5:00 PM
Technical Forum: Users session Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Alberto Ribon (CERN), Marc Verderi (Centre National de la Recherche Scientifique (FR)), Marilena Bandieramonte (University of Pittsburgh (US))-
3:30 PM
Application of Geant4 for proton therapy research ~ An example case of Hokkaido University 30mSpeaker: Prof. Taeko Matsuura
- 4:00 PM
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3:30 PM
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9:00 AM
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12:30 PM
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9:00 AM
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10:30 AM
Plenary 9: Summary of parallel sessions I Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Benjamin Morgan (University of Warwick (GB)), Ivana Hrivnacova (Université Paris-Saclay (FR))-
9:00 AM
Parallel 1A: New EM developments 13mSpeaker: Jonas Hahnfeld (CERN)
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9:13 AM
Parallel 1B: Generic Processes & Materials 13mSpeaker: Marc Verderi (Centre National de la Recherche Scientifique (FR))
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9:26 AM
Parallel 2A: Basic, Extended and Advanced Examples 13mSpeakers: Ivana Hrivnacova (Université Paris-Saclay (FR)), Susanna Guatelli
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9:39 AM
Parallel 2B: Geometry Working Session 13mSpeaker: John Apostolakis (CERN)
- 9:52 AM
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10:05 AM
Parallel 3B: Computing Performance 13mSpeakers: Gunter Folger, Soon Yung Jun (Fermi National Accelerator Lab. (US))
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10:18 AM
Parallel 4A: Internal Communication Tools & Procedures; Publication Board Tools 12mSpeakers: Alexander Howard (Imperial College (GB)), Benjamin Morgan (University of Warwick), Marc Verderi (Centre National de la Recherche Scientifique (FR))
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9:00 AM
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10:30 AM
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11:00 AM
Break 30m
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11:00 AM
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12:30 PM
Plenary 10: Summary of parallel sessions II & closing remarks Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111Conveners: Alberto Ribon (CERN), Krzysztof Genser (Fermi National Accelerator Laboratory (US))-
11:00 AM
Parallel 5A: New EM validations 15mSpeaker: Jay Archer (University of Wollongong)
- 11:15 AM
- 11:30 AM
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11:45 AM
Parallel 6B: R&D TF 15mSpeaker: John Apostolakis (CERN)
- 12:00 PM
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12:10 PM
Closing Remarks 10mSpeaker: Marc Verderi (Centre National de la Recherche Scientifique (FR))
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12:20 PM
Announcement of 29th Geant4 Collaboration Meeting 10mSpeaker: Pablo Cirrone
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11:00 AM
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12:30 PM
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2:00 PM
Lunch break 1h 30m
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2:00 PM
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5:00 PM
Steering Board Meeting Room A
Room A
Hokkaido University
Hokkaido University Kita 8, Nishi 5, Kita-ku, Sapporo, Hokkaido, 060-0808 Japan +81-11-716-2111
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9:00 AM
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10:30 AM