$Id: Readme-Questions for project $name


                            Geant4 Basics
                            -------------
	
 1 - OBJECTIVE

 Start Geant4 novice and extended examples.
	 	

 2 -  HOW TO START?
 
 For background information see 
 <a href="http://cern.ch/geant4/support/gettingstarted.shtml">Getting Started</a>

 To start tutorial create an empty directory you will use for all exercises 
 and cd in it.
        % mkdir work
        % cd work

 To start Geant4 a set of environment varials should be defined. The virtual
 PC software is prebuilt, so Geant4 and ROOT environment variables
 are initialised in shell script and are available after each login.

 Examples allowing start Geant4 without c++ coding. For tutorial purposes 
 examples should be copied to the work directory compiled and used in interactive 
 mode. 

	 	
 3 - PRACTICE
 	
 Study Geant4 environment. Run novice and extended examples.

		
 4 - PROBLEM 1 Geant4 environment
 
 Study the most important Geant4 environment variables and basic structure of
 directories.

        % env | grep G4
        % env | grep ROOT

        % echo $G4INSTALL
        % ls   $G4INSTALL
        % ls   $G4INSTALL/source

        % echo $CLHEP_BASE_DIR
        % echo $G4SYSTEM
        % echo $G4WORKDIR  

 Questions:  In what sub-directory there are Geant4 examples?
             What Geant4 version is installed at this VM?
             
		
 5 - Compile and run novice example N02
  
 Copy example from the repository to the local place compile and run.

        % cp -r $G4INSTALL/examples/novice/N02 ./
        % cd N02
        % gmake -j2
        % ls $G4WORKDIR 
        % ls $G4WORKDIR/bin/Linux-g++/
        % $G4WORKDIR/bin/Linux-g++/exampleN02 

 Questions:  What UI commands are available?
             How to change primary particle?
             How to change primary energy? 
             How to activate verbose output?
  
        Idle> ls
        Idle> /gun/particle proton
        Idle> /gun/energy 2 GeV
        Idle> /run/beamOn 1
        Idle> /run/beamOn 100
        Idle> /gun/particle gamma
        Idle> /run/beamOn 1
        Idle> /gun/particle mu+
        Idle> /tracking/verbose 1
        Idle> /run/beamOn 1
        Idle> /tracking/verbose 2
        Idle> /run/beamOn 1

 end the program using

        Idle> exit   


 6 - Study novice example N02

 Try to understand the structure of the example.

        % ls
        % less README
        % less exampleN02.cc
        % ls include
        % ls src

 Questions:  Which classes are mandatory?
             In which class geometry is constructed?
             In which class primary beam is defined?
             In which class physics is defined?

 7 - Study extended example TestEm3

 Try to understand the structure of the extended electromagnetic example 
 of sampling calorimeter. 

        % cd ../
        % ls
        % cp -r $G4INSTALL/examples/extended/electromagnetic/TestEm3 ./
        % cd TestEm3
        % gmake -j4
        % ls $G4WORKDIR 
        % ls $G4WORKDIR/bin/Linux-g++/
        % $G4WORKDIR/bin/Linux-g++/TestEm3 

 Questions:  Which classes are mandatory?
             In which class geometry is constructed?
             In which class primary beam is defined?
             In which class physics is defined?

 Default geometry: 50 layers 2.3 mm Lead and 5.7 mm liquid Argon

        Idle> /control/execute vis.mac
        Idle> /gun/particle e-
        Idle> /gun/energy 1 GeV
        Idle> /run/beamOn 1
        Idle> /run/beamOn 100

 Questions:  Which UI commands specific for this example?
             At what energy electrons will be absorped in the first absorber layer?
        
        Idle> ls
        Idle> /gun/energy 500 MeV
        Idle> /run/beamOn 1
        Idle> /gun/energy 300 MeV
        Idle> /run/beamOn 1
        Idle> /gun/energy 200 MeV
        Idle> /run/beamOn 1
        Idle> /gun/energy 100 MeV
        Idle> /run/beamOn 1
        Idle> /gun/energy 50 MeV
        Idle> /run/beamOn 1
        Idle> /run/beamOn 10
        Idle> /gun/energy 20 MeV
        Idle> /run/beamOn 1
        Idle> /run/beamOn 10
        Idle> /gun/energy 10 MeV
        Idle> /run/beamOn 1
        Idle> /run/beamOn 10
        Idle> /gun/energy 5 MeV
        Idle> /run/beamOn 1
        Idle> /run/beamOn 10

 8 - Geant4 particle definition
 
        % ls
        % cd work/TestEm3
        % $G4WORKDIR/bin/Linux-g++/TestEm3 

 Questions: Which particles are defined?
            Which processes defined for gamma?
            Which processes defined for electron?
            Which processes defined for positron?
            Which processes defined for proton?
            What processes are active alogn step?
            What processes are active at rest?

        Idle> /control/execute vis.mac
        Idle> /particle/list
        Idle> /particle/select gamma
        Idle> /particle/property/dump
        Idle> /particle/process/dump
        Idle> /particle/select e-
        Idle> /particle/property/dump
        Idle> /particle/process/dump
        Idle> /particle/select e+
        Idle> /particle/property/dump
        Idle> /particle/process/dump
        Idle> /particle/select proton
        Idle> /particle/property/dump
        Idle> /particle/process/dump

 9 - Study Geant4 documentation

 In your web browser access http:/web.geant4.org/

 Questions:  What public version is the most recent?
             Where is Installation Guide?
             Where is Application developer manual?
             Where is Physics reference Manuel?
             Where is a link to Geant4 HyperNews?