$Id: README,v 1.8 2003/10/06 10:02:19 maire Exp $ ------------------------------------------------------------------- ========================================================= Geant4 - an Object-Oriented Toolkit for Simulation in HEP ========================================================= TestEm1 ------- This example has been setup to test individualy the electromagnetic processes. 1- GEOMETRY DEFINITION It is a simple box which represente an 'infinite' homogeneous medium. Two parameters define the geometry : - the material of the box, - the (full) size of the box. In addition a transverse uniform magnetic field can be applied. The default geometry is constructed in DetectorConstruction class, but all of the above parameters can be changed interactively via the commands defined in the DetectorMessenger class. 2- PHYSICS LIST The particle list is the one of novice/exampleN03. The physics list contains the 'standard' electromagnetic processes, and decay. Few commands have been added to PhysicsList, in order to set the production threshold for secondaries either in range for gamma, e-/e+, proton or directly in energy for all charged. 3- AN EVENT : THE PRIMARY GENERATOR The primary kinematic consists of a single particle starting at the middle of the box. The type of the particle and its energy are set in the PrimaryGeneratorAction class, and can be changed via the G4 build-in commands of ParticleGun class (see the macros provided with this example). In addition one can choose randomly the impact point of the incident particle. The corresponding interactive command is built in PrimaryGeneratorMessenger class. A RUN is a set of events. 4- VISUALIZATION The Visualization Manager is set in the main(). The initialisation of the drawing is done via the commands /vis/... in the macro vis.mac. To get visualisation: > /control/execute vis.mac The detector has a default view which is a longitudinal view of the box. The tracks are drawn at the end of event, and erased at the end of run. Optionaly one can choose to draw all particles, only the charged one, or none. This command is defined in EventActionMessenger class. 5- PHYSICS SURVEY The particle's type and the physic processes which will be available in this example are set in PhysicsList class. A set of macros defining various run conditions are provided. The processes are actived/inactived together with differents cuts, in order to survey the processes one by one. The number of produced secondaries are counted, the number of steps, and the number of process calls responsible of the step. 6- HOW TO START ? - compile and link to generate an executable % cd geant4/examples/extended/electromagnetic/TestEm1 % gmake - execute TestEm1 in 'batch' mode from macro files % TestEm1 run10.mac - execute TestEm1 in 'interactive mode' with visualization % TestEm1 .... Idle> type your commands .... Idle> exit 7- HISTOGRAMS Testem1 produces several histo which are saved as testem1.paw Content of these histo: 1 : track length of a charged particle 2 : number of steps per track (charged particle) 3 : step length (charged particle) Note that, by default, histograms are disabled. To activate them, uncomment the flag G4ANALYSIS_USE in GNUmakefile. 8- Using the Anaphe implementation of the AIDA 3.0 histograms: -------------------------------------------------------------- In order to use the Anaphe implementation of the AIDA 3.0 interfaces, the 'aida-config' command (which is used in the GNUmakefile) is available at: /afs/cern.ch/sw/lhcxx/share/LHCXX/latest/scripts/aida-config In order to run the executable, you need to source the following script (once): $HOME/bin/setupAnaphe.csh (or $HOME/bin/setupAnaphe) At cern 'setupAnaphe' is available at: /afs/cern.ch/sw/lhcxx/share/LHCXX/latest/scripts/setupAnaphe.csh (or /afs/cern.ch/sw/lhcxx/share/LHCXX/latest/scripts/setupAnaphe)