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0002
0003 =========================================================
0004 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
0005 =========================================================
0006
0007 TestEm10
0008 --------
0009
0010 Test for investigation of transition radiation.
0011 Default setup for "TestEm10.in" and "TestEm10.large_N.in" is the simplified
0012 setup for ALICE XTR test beam (~2004), defined in DetectorSimpleALICE class.
0013
0014
0015 1- GEOMETRY DEFINITION
0016
0017 The geometry setup includes "radiator" and "absorber" volumes
0018 of a box shape.
0019
0020 The "radiator" material is defined as a mixture of a gas and foil material
0021 and the "absorber" contains a gas material.
0022
0023 Several geometry setups are defined in the classes
0024 DetectorSetupX,
0025 where SetupX = ALICE06, Bari05, Barr90, Construction, Harris73, Messenger, SimpleALICE, Watase86
0026
0027 The default setup, SimpleALICE, can be changed via UI command:
0028 /XTRdetector/setup setup
0029 where setup = simpleALICE, alice06, bari05, harris73, watase86, barr90
0030
0031 2- PRIMARY GENERATOR
0032
0033 The primary kinematic consists of a single particle which hits the
0034 absorber perpendicular to the input face. The type of the particle
0035 and its energy are set in the PrimaryGeneratorAction class, and can
0036 be changed via the G4 build-in commands of G4ParticleGun class (see
0037 the macros provided with this example).
0038
0039 3- DETECTOR RESPONSE
0040
0041 In this example the total energy deposited in the "absorber" volume
0042 is accounted in SensitevDetector class, and a spectrum of XTR gamma
0043 particles, all secondary gamma particles and all secondary e-
0044 particleas is accounted in StackingAction class.
0045
0046 4- PHYSICS
0047
0048 The particle's type and the physic processes which will be available
0049 in this example are set in PhysicsList class.
0050 The trasition radiation process is defined in the
0051 TransitionRadiationPhysics builder.
0052
0053 The transition radiator models can be changed simply with:
0054
0055 Idle> /emphyslist/setXTRModel modelName
0056
0057 See macro files "*.mac" for different setups providede with the example.
0058
0059 5 - HISTOGRAMS
0060
0061 Testem10 produces several histo which are saved as testem10.root by default.
0062 Content of these histo:
0063 1: Energy deposit in absorber
0064 2: XTR Gamma spectrum
0065 3: Secondary Gamma spectrum
0066 4: Secondary e- spectrum
0067 5: Energy deposit in absorber with the same histogram parameters
0068 as in the previous version of this example (Geant4 version <=10.2)
0069
0070 The histograms are managed by G4AnalysisManager class and its Messenger.
0071 The histos can be individually activated with the command :
0072 /analysis/h1/set id nbBins valMin valMax unit
0073 where unit is the desired unit for the histo (MeV or keV, deg or mrad, etc..)
0074
0075 One can control the name of the histograms file with the command:
0076 /analysis/setFileName name (default testem1)
0077
0078 It is possible to choose the format of the histogram file : root (default),
0079 hdf5, xml, csv, by changing the default file type in HistoManager.cc
0080
0081 It is also possible to print selected histograms on an ascii file:
0082 /analysis/h1/setAscii id
0083 All selected histos will be written on a file name.ascii (default testem1)
0084
0085 6- HOW TO START ?
0086
0087 - execute TestEm10 in 'batch' mode from macro files e.g.
0088 % TestEm10 TestEm10.in [TestEm10.large_N.in]
0089
0090 - execute TestEm10 in 'interactive' mode with visualization e.g.
0091 % TestEm10
0092 ....
0093 Idle> type your commands
0094 ....
0095
0096 7- MACROS
0097 alice06.mac: ALICE simplified 2006 test beam setup
0098 bari05.mac: setup of Bari INFN group (M. Bridgida et al, NIM A550 (2005) 157-168 (fig. 8))
0099 barr90.mac: NIM A294 (1990) 465-472 (fig. 11) setup
0100 harris73.mac: NIM 107 (1973) 413-422 (fig. 3b) setup
0101 salice.mac: ALICE simplified 2006 test beam setup with disabled
0102 ionisation and multiple scattering
0103 watase86.mac: NIM A248 (1986) 379-388 (fig. 7) setup
