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1 -------------------------------------------------------------------
2
3 =========================================================
4 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 =========================================================
6
7 field02
8 -------
9
10 Test for investigation of tracking in electric field
11 and field dependent electromagnetic processes.
12
13 1- FIELD DEFINITION
14 The field is a constant electric field.
15
16 Technical note: in order to use any electric field, it is
17 necessary to create the objects for its equation of motion,
18 the stepper and driver for the integration, and the
19 chord finder.
20
21 The class that does these is G4FieldBuilder. Its object
22 is created in the F02DetectorConstruction constructor and
23 its instantiation adds the /field UI commands that allow user
24 to choose the field configuration parameters.
25
26 The electric field (G4UniformElectricField) is then created in
27 F02DetectorConstruction::ConstructSDanField() and passed to
28 G4FieldBuilder, that constructs all necessary objects according
29 to the user defined (or default) configuration parameters.
30
31 1- GEOMETRY DEFINITION
32
33 The "Absorber" is a solid made of a given material.
34
35 Three parameters define the absorber :
36 - the material of the absorber,
37 - the thickness of an absorber,
38 - the transverse size of the absorber (the input face is a square).
39
40 The volume "World" contains the "Absorber".
41 In this test the parameters of the "World" can be changed , too.
42
43 In addition a transverse uniform electric field can be applied.
44
45 The default geometry is constructed in F02DetectorConstruction class,
46 but all the parameters can be changed via
47 the commands defined in the F02DetectorMessenger class.
48
49 2- AN EVENT : THE PRIMARY GENERATOR
50
51 The primary kinematic consists of a single particle which hits the
52 absorber perpendicular to the input face. The type of the particle
53 and its energy are set in the F02PrimaryGeneratorAction class, and can
54 be changed via the G4 build-in commands of G4ParticleGun class (see
55 the macros provided with this example).
56
57 It is also possible to change the position of the primary particle vertex
58 or activate its randomization via the commands defined in the
59 F01PrimaryGeneratorMessenger class.
60
61 A RUN is a set of events.
62
63 3- DETECTOR RESPONSE
64
65
66 A HIT is a record, event per event , of all the
67 informations needed to simulate and analyse the detector response.
68
69 In this example a F02CalorHit is defined as a set of 2 informations:
70 - the total energy deposit in the absorber,
71 - the total tracklength of all charged particles in the absorber,
72
73 Therefore the absorber is declared
74 'sensitive detector' (SD), see F02CalorimeterSD, which means they can contribute to the hit.
75
76 4- PHYSICS LIST
77
78 The particle's type and the physic processes which will be available
79 in this example are set in the FTFP_BERT physics list. This physics list
80 requires data files for electromagnetic and hadronic processes.
81 See more on installation of the datasets in Geant4 Installation Guide,
82
83 5- HOW TO START ?
84
85 - Execute field02 in 'batch' mode from macro file e.g.
86 % ./field02 field02.in
87
88 - Execute field02 in 'interactive' mode with visualization e.g.
89 % ./field02
90 ....
91 Idle> /run/beamOn 1
92 ....
