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0001 -------------------------------------------------------------------
0002
0003 =========================================================
0004 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
0005 =========================================================
0006
0007 monopole
0008 --------
0009 V.Ivanchenko, M.Vladymyrov
0010 CERN, Geneva, Switzerland
0011 Lebedev Physical Institute, Moscow, Russia
0012
0013
0014 This example is devoted to the energy deposited by classical magnetic
0015 monopole.
0016
0017
0018
0019 1- GEOMETRY DEFINITION
0020
0021 The geometry consists of a single block of a homogenous material,
0022 placed in a world.
0023
0024 Four parameters define the geometry :
0025 - the material of the box
0026 - the thickness of the box
0027 - the tranverse dimension of the box
0028 - the maximal step size in target
0029
0030 The default is 10 cm of alumunium, step is limited by 5mm.
0031 Equivalent UI commands are following:
0032 /testex/det/setMat G4_Al
0033 /testex/det/sizeX 10 cm
0034 /testex/det/sizeYZ 5 cm
0035 /testex/det/setStepSize 5 mm
0036
0037 The default geometry is constructed in DetectorConstruction class,
0038 but all of the above parameters can be changed interactively via
0039 the commands defined in the DetectorMessenger class.
0040
0041 In addition, a global, uniform, and transverse magnetic field can be applied
0042 via G4MonopoleFieldSetup class, with the default z-value 0.2 tesla.
0043 This value can be changed via UI command:
0044 /testex/fld/setField 0.2 tesla
0045
0046 2- PHYSICS LIST
0047
0048 The physics list includes standard FTFP_BERT physics and the additional builder
0049 or monopole physics.
0050 To define monopole parameters an extra string should be provided via
0051 the program arguments:
0052 ./monopole -s '2 0 200 GeV' # in the interactive mode
0053 ./monopole -m file.mac -s '2 0 200 GeV' # in the batch mode
0054
0055 3- AN EVENT : THE PRIMARY GENERATOR
0056
0057 The primary kinematic consists of a single particle which hits the
0058 block perpendicular to the input face. The type of the particle
0059 and its energy are set in the PrimaryGeneratorAction class, and can
0060 changed via the G4 build-in commands of ParticleGun class (see
0061 the macros provided with this example).
0062 The default is monopole 100 GeV.
0063
0064 4- VISUALIZATION
0065
0066 The Visualization Manager is set in the main() for interactive session,
0067 the initial parameters of the program are defined in the init_vis.mac macro
0068 which then executes the visualisation macro, vis.mac.
0069
0070 The detector has a default view which is a longitudinal view of the box.
0071
0072 The tracks are drawn at the end of event, and erased at the end of run.
0073
0074
0075 5- HOW TO RUN ?
0076
0077 This example handles the program arguments in a similar way as the basic
0078 B4 example.
0079 It can be run with the following optional arguments:
0080 % ./monopole [-m macro ] [-s setupMonopole] [-t nThreads]
0081
0082 The -s option was already explained in the Physics list section.
0083 The -t option is available only in multi-threading mode
0084 and it allows the user to override the Geant4 default number of
0085 threads. The number of threads can be also set via G4FORCENUMBEROFTHREADS
0086 environment variable which has the top priority.
0087
0088 - Execute program in the 'batch' mode from macro files
0089 % ./monopole -m monopole.in [-s setupMonopole]
0090
0091 - Execute program in the 'interactive mode' with visualization
0092 % ./monopole [-s setupMonopole]
0093 ....
0094 Idle> type your commands
0095 ....
0096 Idle> exit
0097
0098
0099 6- HISTOGRAMS
0100
0101 The result is five histograms:
0102 - Monopole eneregy deposition in current material
0103 - dedx for proton
0104 - dedx for monopole
0105 - range for proton in current material
0106 - range for monopole in current material
0107
0108 The histogram is saved in Root file.
0109 Limit of bin size can be set with testex/run/binSize (default 5mm). Real size
0110 is chosen as a minimal between this and step limit (see Geometry section)
0111
