2020 Session 1 : Exercise

Code for download: session1_start.tar.gz

Exercise:

• Geant4 is already installed on the machines in the directory /usr/local. Please, do not forget to run the Geant4 script to define the environment needed to build & run Geant4 application; for example is you isntalled Geant4 in /usr/local/bin:
. /usr/local/bin/geant4.sh

• Build & run the example:
  • Download the start source code session1_start.tar.gz. (On MacOS, the file will be saved as session1_start.tar.gz in $HOME/Downloads directory.)
  • Untar the file:
    tar xvf session1_start.tar.gz
  • Rename the session1_start directory as exampleED:
    mv session1_start exampleED
  • Create the example build directory, run cmake and make to build the application: 
mkdir exampleED_build
cd exampleED_build
cmake ../exampleED
make
  • Run the created executable:
./exampleED
    • You can also find the instruction how to build and run the example at the Geant4 examples Web page .

• Get familiar with the provided code
  • You can skip EDDetectorConstruction.cc and EDPrimaryGeneratorAction.cc which will be explored later

• Get familiar with Geant4 Qt User Interface
  • Use the provided button (an arrow in a green circle) to run 1 event, observe the picture and the output in the Output window.
  • Run 1 event from the command line. You have to type this command in the Session window:
    /run/beamOn 1
  • Run 1 event via a selection of the command from the Help menu.
  • Set tracking verbose level to 1 and observe the output:
    /tracking/verbose 1

• Add printing of the event number at the begin of event and another printing about the end of event in the EDEventAction class:
  G4cout << ">>> Start event: " << event->GetEventID() << G4endl;
G4cout << ">>> End event: " << event->GetEventID() << G4endl;
  • Hint: Each line of the code above should be inserted in the relevant function of the EDEventAction class in the EDEventAction.cc file.

Solution: session1_solution.tar.gz