Geant4 tutorial course

Session

Tutorial

Mar 25, 2024, 9:30 AM

CEBAF Center room F113 (Jefferson Lab)

2. Welcome and tutorial introduction

Amber Boehnlein (JLAB), Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/25/24, 9:30 AM

3. Introduction to detector simulation

Dennis Wright (Geant4 AI)

3/25/24, 9:45 AM

• Basics of Monte Carlo method
• Monte Carlo particle transport
• Variance reduction techniques

4. Kernel 1

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/25/24, 10:15 AM

• General introduction and brief history
• Geant4 license
• Geant4 kernel
• User classes

5. User documents and examples

Dennis Wright (Geant4 AI)

3/25/24, 11:20 AM

• User guides
• Basic, extended and advanced examples
• User forum and mailing list
• Code browser
• Technical forum

6. User interface 1

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/25/24, 12:00 PM

• Basics of UI commands
• Macro file
• Alias and loop
• Some useful UI commands

8. Physics overview 1

Dennis Wright (Geant4 AI)

3/25/24, 1:30 PM

• Introduction
• Overview of Geant4 physics
• Physics list

13. Physics overview 2

Mihaly Novak (CERN)

3/25/24, 2:00 PM

• Process in Geant4
• Stepping mechanism
• Production threshold

7. Visualization

Maurizio Ungaro (Jefferson Lab)

3/25/24, 2:30 PM

• Basics of visualization
• UI commands for visualization

10. Material definition

Mihaly Novak (CERN)

3/26/24, 9:00 AM

• Introduction
• Material definition
• NIST material database

11. Geometry 1

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/26/24, 9:30 AM

• Introduction
• G4VUserDetectorDefinition class
• Solid and shape
• Logical volume
• Region
• Physical volume
• Palcement

15. Geometry 2

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/26/24, 10:50 AM

• Various ways of defining physical volume -Parameterized volume
  -- Replicated volume
  -- Divided volume
  -- Nested parameterization
  -- Assembly volume
  -- Reflection volume
• Touchable
• Geometry checking tools
• Geometry optimization

14. Analysis

Maurizio Ungaro (Jefferson Lab)

3/26/24, 11:50 AM

• Introduction
• G4AnalysisManager
• Histogram, plot, n-tuple
• UI commands for analysis

12. Scoring 1

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/26/24, 1:30 PM

• Built-in command-based scorers
• Box and cylindrical scoring meshes
• Assigning scorers to real-world volumes
• Probe scorers
• Filling histograms through scorers

35. Physics overview 3

Dennis Wright (Geant4 AI)

3/26/24, 2:00 PM

• Decay processes
• Optical photon and optical processes
• Phonons and channeling

9. Primary particle

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/26/24, 2:30 PM

• Introduction
• Built-in primary particle generators
• Pre-assigned decay

16. Geometry 3

Dennis Wright (Geant4 AI)

3/27/24, 9:00 AM

• Introduction to field
• Field implementation
• Field integration
• Customizing field integration

17. EM physics 1

Mihaly Novak (CERN)

3/27/24, 9:30 AM

• Overview
• EM processes and stepping
• Multiple scattering and transportation
• Special EM topics
  -- EM models per region
  -- Atomic de-excitation
  -- Energy-loss fluctuation

18. EM physics 2

Mihaly Novak (CERN)

3/27/24, 10:50 AM

• Low-energy EM models
  -- Livermore, including polarized photon models
  -- Penelope models
  -- Ion ICRU’73 model
  -- Geant4-DNA processes and models (beyond physics)
  -- MicroElec processes and models
  -- Monash University models
• Physics list settings for low-E EM

19. Hadronic physics 1

Maurizio Ungaro (Jefferson Lab)

3/27/24, 11:40 AM

• Introduction
• Cross-section and final state model
• Pre-compound and de-excitation models
• Cascade models
• QCD String models

20. Hadronic physics 2

Dennis Wright (Geant4 AI)

3/27/24, 1:30 PM

• Elastic processes and models
• Low-energy neutron and proton models
• Ion-ion physics
• Capture, stopping and fission reactions

21. Scoring 2

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/27/24, 2:15 PM

• Introduction to detector sensitivity
• G4SensitiveDetector class
• Hits and hits collection
• Touchable
• G4HCofThisEvent class
• Accumulating scores for a run

22. User interface 2

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/28/24, 9:00 AM

• UI overview
• Define UI command
• G4GenericMessenger class
• UI command in multithreaded mode

23. Hadronic physics 3

Dennis Wright (Geant4 AI)

3/28/24, 9:40 AM

• Gamma-nuclear models
• Lepto-nuclear models
• Radioactive decay

24. Geometry 4

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/28/24, 10:10 AM

• GDML and CAD interface
• Parallel world and layered mass geometry
• Moving volume

25. Event Biasing and Fast Simulation

Dennis Wright (Geant4 AI)

3/28/24, 11:00 AM

• Event biasing overview
• Event biasing methods
• Fast simulation overview
• Fast simulation interfaces and example applications

26. Kernel 2

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/28/24, 11:40 AM

• User limits
• Attaching user information to Geant4 classes
• Stacking mechanism

27. Choosing physics list

Mihaly Novak (CERN)

3/28/24, 3:30 PM

• Pre-packages physics lists
• Validation and geant-val
• Examples

28. Multithreading and heterogeneous computing

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/28/24, 4:10 PM

• Multithreading introduction
• Thread safety and race condition
• Geant4 multithreading models
• MPI
• Examples of Geant4 applications using GPUs
  -- Optical photon transport
  -- EM particle transport

29. Updating Geant4 installation

Maurizio Ungaro (Jefferson Lab)

3/28/24, 4:40 PM

• Geant4 releases
• What to look for in the release note
• How to update

30. Concluding remarks

Dr Makoto Asai (Thomas Jefferson National Accelerator Facility)

3/28/24, 4:55 PM