| Geant4 Cross Reference |
1 In this example, the particle fluence is evalu 1 In this example, the particle fluence is evaluated for a simple set-up,
2 consisting of one target solid cylinder, with 2 consisting of one target solid cylinder, with axis along the z-direction,
3 and a beam particle shot before the target alo 3 and a beam particle shot before the target along the axis of the target.
4 4
5 The particle fluence is computed in three plac 5 The particle fluence is computed in three places: "upstream", "downstream"
6 and "side", defined as the positions immediate 6 and "side", defined as the positions immediately after, before and aside,
7 respectively, of the target with respect to th 7 respectively, of the target with respect to the direction of the primary
8 particle. 8 particle.
9 9
10 The particle fluence is estimated by summing t 10 The particle fluence is estimated by summing the track length in a
11 "scoring volume" - i.e. a thin cylinder (for " 11 "scoring volume" - i.e. a thin cylinder (for "upstream" and "downstream"
12 cases) or a thin hemisphere shell (for the "si 12 cases) or a thin hemisphere shell (for the "side" case) filled up with
13 G4_Galactic (very low density gas) material, i 13 G4_Galactic (very low density gas) material, immediately outside the
14 target - and then dividing for the cubic volum 14 target - and then dividing for the cubic volume of such scoring volume.
15 15
16 Complementary information on average multiplic 16 Complementary information on average multiplicity, average kinetic energy,
17 and average total energy flow (i.e. sum of kin 17 and average total energy flow (i.e. sum of kinetic energies) for the
18 particles produced in the target are also comp 18 particles produced in the target are also computed.
19 19
20 The particle fluence is evaluated for the foll 20 The particle fluence is evaluated for the following 11 particle types:
21 - all 21 - all
22 - electron + positron 22 - electron + positron
23 - gamma 23 - gamma
24 - muon- + muon+ 24 - muon- + muon+
25 - neutrino (any flavour and including anti-ne 25 - neutrino (any flavour and including anti-neutrino)
26 - charged pions 26 - charged pions
27 - neutron + anti_neutron 27 - neutron + anti_neutron
28 - proton + anti_proton 28 - proton + anti_proton
29 - ion (and anti-ions) 29 - ion (and anti-ions)
30 - otherMeson (e.g. kaons, etc.) 30 - otherMeson (e.g. kaons, etc.)
31 - otherBaryon (e.g. hyperons, etc.) 31 - otherBaryon (e.g. hyperons, etc.)
32 32
33 The particle fluence is evaluated for the foll 33 The particle fluence is evaluated for the following 3 kinematical ranges:
34 - any kinetic energy 34 - any kinetic energy
35 - kinetic energy < 20 MeV 35 - kinetic energy < 20 MeV
36 - kinetic energy > 20 MeV 36 - kinetic energy > 20 MeV
37 37
38 Look for the string "***LOOKHERE***" for those 38 Look for the string "***LOOKHERE***" for those parameters/options that
39 are either hardwired in the code (i.e. not ava 39 are either hardwired in the code (i.e. not available via UI command),
40 or default values of UI commands. 40 or default values of UI commands.
41 41
42 This example uses the physics list factory, th 42 This example uses the physics list factory, therefore you can specify
43 the reference physics list you want to use via 43 the reference physics list you want to use via the PHYSLIST
44 environmental variable (by default, if you don 44 environmental variable (by default, if you don't set it, the FTFP_BERT
45 physics list is used). 45 physics list is used).
46 46
47 To build this example: 47 To build this example:
48 48
49 mkdir Build; cd Build 49 mkdir Build; cd Build
50 cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo \ 50 cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo \
51 -DGeant4_DIR=/path-to-geant4-libraries 51 -DGeant4_DIR=/path-to-geant4-libraries ../.
52 make 52 make
53 53
54 To run it: 54 To run it:
55 55
56 ./Layer all_together.in 56 ./Layer all_together.in
57 57
58 which shoots 50 GeV pion- on different target 58 which shoots 50 GeV pion- on different target materials, 100 events
59 in each run, and print out some information on 59 in each run, and print out some information on the particle fluence
60 at the end of each run. 60 at the end of each run.
61 Other macros exist for specific materials: 61 Other macros exist for specific materials:
62 cu.in, fe.in, graphite.in, lar.in, pb.in, pbwo 62 cu.in, fe.in, graphite.in, lar.in, pb.in, pbwo4.in, polystyrene.in, si.in, w.in .