Session 6 : Enoncé

Code for download: session6_start.tar.gz

Exercise:

• With use of G4AnalysisManager
  (see example B4/B4d ):
  1. Create & fill histogram
     • Define a 1D histogram for the energy deposited per event for each calorimeter layer
     • Implement filling of histograms in the EDEmCalorimeterSD::EndOfEvent() function;
     • Hint: To access the i-th calorimeter hit from fHitsCollection:
       EDEmCalorimeterHit* hit = (EDEmCalorimeterHit*)(*fHitsCollection)[i];
  2. Create & fill ntuple
     • Define an ntuple representing the tracker chamber hit:
       • the chamber layer number
       • hit local position (x, y, z)
     • Implement filling of ntuple in  EDChamberSD::ProcessHits();
     • Hint: Add a data member for ntuple ID in EDChamberSD, so that each instance of Chamber sensitive detector is associated with a different ntuple.
  3. Inspect generated file in Root with Root browser
• Add menu in GUI using command line interface
  • Add a menu « View » in the toolbar (on apple computers, the menu bar is always at the top of the screen)
  • In this View menu, add two buttons for setting the viewPoint at Theta/Phi (0,0) and (90,0)
  • In this View menu, add a button for setting a viewPoint and ask for it (define a command without parameters)
• Manipulate visualization scene
  • Add axes at the middle of the EmCalorimeter
  • Add date on your scene
  • Add text in red near your tube withe the « tube » label
  • Set background to « gray »
  • Make an 8000*6000 EPS file (with 100 events) and look at it
  • Complete vis.mac with these comands

Solution: session6_solution.tar.gz

Exercise ++:

The exercises marked as ++ are optional; they are recommended for participants who have already some experience with Geant4 and get some time left for practicing more than the basic exercise proposed above.

• Use one 2D histogram for all calorimeter layers.