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Exercises

Geant4 tutorial, 25-26 May 2005. Exercises. Alberto Ribon CERN PH/SFT. Introduction. Copy the example N03 in your local area Try to build it and run it. For each exercise, do the following: Read carefully the text

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Exercises

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  1. Geant4 tutorial, 25-26 May 2005 Exercises Alberto Ribon CERN PH/SFT

  2. Introduction • Copy the example N03 in your local area • Try to build it and run it. For each exercise, do the following: • Read carefully the text • Try to solve it, by modifying some files of the example N03 in your area • Look at the solution.

  3. Exercise on: Geometry • Add a G4Box of dimensions: 1 mm x CalorSizeYZ x CalorSizeYZ • Material: scintillator, Sci Caveat: you need to define a private member variable to store the local variable Sci. • Place the box 1 cm in front (i.e. before) of the calorimeter along the x-axis Hint: the position along the x-axis of the calorimeter starts at x = - CalorThickness/2.0 and the center of the box should be 1 cm before it (i.e at lower x).

  4. (continuation) • The solution is in the directory: geometry/ • Copy the header files .hh in your local directory include/ and the source files .cc in your local directory src/

  5. Exercise on: B field • A global uniform magnetic field is applied along the z-axis. Change it in such a way that the field is applied along the x-axis . • Hint: look at the constructor G4ThreeVector(x,y,z) in the method ExN03DetectorConstruction::SetMagField • Solution is in the directory: bfield/

  6. Exercise on: Physics • In the directory: physics_example/ you find how to use the Physics List LHEP . Copy the files in your local directory. • Change it in such a way to use the Physics List QGSP instead of LHEP. Hint: look at the main program exampleN03.cc • Solution is in the directory: physics/

  7. Exercise on: Sensitivity • In the directory: sensitivity_example/ you find how to make the added scintillator box a sensitive volume. Each deposit of energy in this volume produces a hit which stores that deposited energy. Copy the files in your local directory. • Add to the hit the information of the (x,y,z) position of the energy deposit. Hint: use G4Step::GetPreStepPoint() and G4StepPoint::GetPosition() • Solution in the directory: sensitivity/

  8. Exercise on: Analysis • In the directory: analysis_example/ you find a very simple analysis: at the end of each event, the sum of the energy deposits (stored in the hits) in the scintillator box is printed. Copy the files in your local directory. • Print also the average distance of these hits from the origin (0,0,0). Hint: use MyTrackerHit::GetPos() and G4ThreeVector::mag() • Solution in the directory: analysis/

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