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1 -------------------------------------------------------------------
2
3 =========================================================
4 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 =========================================================
6
7 field03
8 -------
9
10 Example of tracking in magnetic field where field associated
11 to selected logical volumes varies.
12
13 A global and a local magnetic field are defined in
14 the ConstructSDandField() method in the F03DetectorConstruction class
15 using the G4FieldBuilder class.
16 The local magnetic field is set to the "Radiator" volume.
17
18 The interactive commands, under the /field directory, are created with
19 the instantiation of G4FieldBuilder in the F03DetectorConstruction constructor,
20
21 1- GEOMETRY DEFINITION
22
23 The "Absorber" is a solid made of a given material.
24
25 Three parameters define the absorber :
26 - the material of the absorber,
27 - the thickness of an absorber,
28 - the transverse size of the absorber (the input face is a square).
29
30 The volume "World" contains the "Absorber".
31 In this test the parameters of the "World" can be changed , too.
32
33 A transverse global uniform magnetic field can be applied.
34 In addition, the "Radiator" volume, which is placed in geometry next
35 to the absorber, has a local magnetic field.
36
37 The default geometry is constructed in F03DetectorConstruction class,
38 but all the parameters can be changed via
39 the commands defined in the F03DetectorMessenger class.
40
41 2- AN EVENT : THE PRIMARY GENERATOR
42
43 The primary kinematic consists of a single particle which hits the
44 absorber perpendicular to the input face. The type of the particle
45 and its energy are set in the F03PrimaryGeneratorAction class, and can
46 be changed via the G4 build-in commands of G4ParticleGun class (see
47 the macros provided with this example).
48
49 It is also possible to change the position of the primary particle vertex
50 or activate its randomization via the commands defined in the
51 F01PrimaryGeneratorMessenger class.
52
53 A RUN is a set of events.
54
55 3- DETECTOR RESPONSE
56
57 A HIT is a record, event per event , of all the
58 informations needed to simulate and analyse the detector response.
59
60 In this example a F03CalorHit is defined as a set of 2 informations:
61 - the total energy deposit in the absorber,
62 - the total tracklength of all charged particles in the absorber,
63
64 Therefore the absorber is declared
65 'sensitive detector' (SD), see F03CalorimeterSD, which means they can contribute to the hit.
66
67 4- PHYSICS LIST
68
69 The particle's type and the physic processes which will be available
70 in this example are set in the FTFP_BERT physics list. This physics list
71 requires data files for electromagnetic and hadronic processes.
72 See more on installation of the datasets in Geant4 Installation Guide,
73
74 5- HOW TO START ?
75
76 - Execute field03 in 'batch' mode from macro files e.g.
77 % ./field03 field03.in
78
79 - Execute field03 in 'interactive' mode with visualization e.g.
80 % ./field03
81 ....
82 Idle> /run/beamOn 1
83 ....
