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1 -------------------------------------------------------------------
2
3 =========================================================
4 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 =========================================================
6
7 ExUCN
8 -----
9 Peter Gumplinger
10 TRIUMF, Vancouver, Canada
11
12 This example exhibits the functionality of UCN physics
13
14
15 1- GEOMETRY DEFINITION
16
17 The geometry consists of a single hollow pipe (cylinder)
18 placed in a world.
19
20 Default World Size: G4Box - 1m x 1m x 100m
21
22 The pipe wall is made of G4_Ni while the world and, hence,
23 the inside of the pipe is made from G4_Galactic
24
25 The G4UCNMaterialPropertiesTable properties are:
26
27 "REFLECTIVITY" = 1
28 "DIFFUSION" = 0.1
29 "FERMIPOT" = 252.0 neV
30 "SPINFLIP"= 0.
31 "LOSS" = 12.5e-5
32 "LOSSCS" = 0.
33 "ABSCS"= 4.49 // 1/v loss cross-section at room temp.
34 "SCATCS" = 18.5 // (incoherent) "elastic" scattering cross-section
35
36 The MicroRoughnessParameters are:
37
38 Roughness correlation length w = 30nm
39 Surface roughness b = 1nm
40 # of angles theta_i in the look-up tables: 180
41 # of energie bins in the look-up tables: 1000
42 min. and max. values of theta_i: 0*degree and 90*degree
43 min. and max values of Energy: 1neV and 1000neV
44 # of angles theta_o in the look-up table calculation: 15
45 # of angels phi_o in the look-up table calculation: 15
46 angular cut: 0.01*degree
47
48 The default step limits in the vacuum is 1mm and maxTime is 100s
49
50 The simulation is in a G4UniformGravityField
51
52 2- PHYSICS LIST
53
54 The ExUCNPhysicsList defines only G4Neutron, G4Proton, G4Electron,
55 G4AntiNeutrinoE, G4MuonPlus, G4MuonMinus and G4GenericIon
56
57 Through ExUCNExtraPhysics the following processes are instantiated:
58
59 G4StepLimiter
60 G4UserSpecialCuts
61
62 and in ConstructUCN()
63
64 G4UCNLoss
65 G4UCNAbsorption
66 G4UCNMultiScattering
67
68 3- AN EVENT : THE PRIMARY GENERATOR
69
70 The primary kinematic consists of a single ultra-cold neutron,
71 uniform between 1neV and 100neV, from the origin and uniform
72 into 4pi solid angle.
73
74 A RUN is a set of events.
75
76
77 4- VISUALIZATION
78
79 The Visualization Manager is set in the main() for interactive session.
80 The initialisation of the drawing is done via the command
81 /control/execute vis.mac
82
83 5- HOW TO START ?
84
85 This example handles the program arguments in a new way.
86 It can be run with the following optional arguments:
87 % ExUCN [-m macro ] [-u UIsession] [-t nThreads]
88
89 The -t option is available only in multi-threading mode
90 and it allows the user to override the Geant4 default number of
91 threads. The number of threads can be also set via G4FORCENUMBEROFTHREADS
92 environment variable which has the top priority.
93
94 - execute ExUCN in 'batch' mode from macro files e.g.
95 % ExUCN -m ExUCN.in > ExUCN.out &
96
97 - execute ExUCN in 'interactive' mode with visualization e.g.
98 % ExUCN
99 ....
100 Idle> type your commands, for example:
101 Idle> run/beamOn 1
102 ....
103
104 6- HISTOGRAMS
105
106 - no histograms for now
