Geant4 TR
A.A. Savchenko
A.A. Tishchenko
D.Yu. Sergeeva
TRD_SAS WS: Simulations
29 Mar 2017
Configuration
Detector:
• XeCO2 volume 3 cm
• 35 um Mylar window
• Distance 2 m / 0 m
• 2m He pipe has 15 um PP walls
Radiator:150 foils
• 62 um with 2 mm gaps
• 0.92 g/cm3
• Air gaps
Simulation was performed for the model of G4 radiator:
Geant4 transparent radiator with including of discrete processes for photons
(photo effect, scattering, pair conversion).
These discrete processes take into account photon absorption in the radiator.
Radiator
Air
2m
XeCO2
He
XeCO2
Radiator
2
Comparison of Geant4 generated spectrum with
Radiator program
e- 20 GeV
Radiator program 𝛾 = 40000
G𝑒𝑎𝑛𝑡4 𝛾 = 40000
3
Comparison of Geant4 generated spectrum with
Radiator program
e- 10 GeV
Radiator program 𝛾 = 20000
G𝑒𝑎𝑛𝑡4 𝛾 = 20000
4
Comparison of Geant4 generated spectrum with
Radiator program
e- 3 GeV
Radiator program 𝛾 = 6000
G𝑒𝑎𝑛𝑡4 𝛾 = 6000
5
Comparison of Geant4 generated spectrum with
Radiator program
e- 1.5 GeV
Radiator program 𝛾 = 3000
G𝑒𝑎𝑛𝑡4 𝛾 = 3000
6
Comparison of Geant4 generated spectrum with
Radiator program
e- 500 MeV
Radiator program 𝛾 = 1000
G𝑒𝑎𝑛𝑡4 𝛾 = 1000
7
Comparison of Geant4 generated spectrum for
different energy of primary e-
G𝑒𝑎𝑛𝑡4 𝛾 = 40 000
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000
8
Comparison of Geant4 generated spectrum with
generated spectrum of Radiator program for different
energy of primary eG𝑒𝑎𝑛𝑡4 𝛾 = 40 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 40 000
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 20 000
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟4 𝛾 = 6 000
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000
Radiator 𝛾 = 3 000
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 1 000
9
Comparison of Geant4 spectrum after radiator with
Geant4 spectrum after 2m He pipe (e- 20GeV)
G𝑒𝑎𝑛𝑡4 after radiator
𝛾 = 40 000
G𝑒𝑎𝑛𝑡4 𝑎𝑓𝑡𝑒𝑟 2𝑚 𝐻𝑒 𝑝𝑖𝑝𝑒
𝛾 = 40 000
10
Comparison of Geant4 spectrum after radiator with
Geant4 spectrum after 2m He pipe (e- 10GeV)
G𝑒𝑎𝑛𝑡4 after radiator
𝛾 = 20 000
G𝑒𝑎𝑛𝑡4 𝑎𝑓𝑡𝑒𝑟 2𝑚 𝐻𝑒 𝑝𝑖𝑝𝑒
𝛾 = 20 000
11
Comparison of Geant4 spectrum after radiator with
Geant4 spectrum after 2m He pipe (e- 3GeV)
G𝑒𝑎𝑛𝑡4 after radiator
𝛾 = 6 000
G𝑒𝑎𝑛𝑡4 𝑎𝑓𝑡𝑒𝑟 2𝑚 𝐻𝑒 𝑝𝑖𝑝𝑒
𝛾 = 6 000
12
Comparison of Geant4 spectrum after radiator with
Geant4 spectrum after 2m He pipe (e- 1.5GeV)
G𝑒𝑎𝑛𝑡4 after radiator
𝛾 = 3 000
G𝑒𝑎𝑛𝑡4 𝑎𝑓𝑡𝑒𝑟 2𝑚 𝐻𝑒 𝑝𝑖𝑝𝑒
𝛾 = 3 000
13
Comparison of Geant4 spectrum after radiator with
Geant4 spectrum after 2m He pipe (e- 0.5GeV)
G𝑒𝑎𝑛𝑡4 after radiator
𝛾 = 1 000
G𝑒𝑎𝑛𝑡4 𝑎𝑓𝑡𝑒𝑟 2𝑚 𝐻𝑒 𝑝𝑖𝑝𝑒
𝛾 = 1 000
14
Comparison of Geant4 spectrum after radiator for
different energy of primary e-
G𝑒𝑎𝑛𝑡4 𝛾 = 40 000
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000
15
Comparison of Geant4 spectrum after radiator with
incident spectrum of Radiator program for different
energy of primary eG𝑒𝑎𝑛𝑡4 𝛾 = 40 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 40 000
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 20 000
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟4 𝛾 = 6 000
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000
Radiator 𝛾 = 3 000
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 1 000
16
Comparison of Geant4 incident spectrum after 2m He
pipe with incident spectrum of Radiator program for
different energy of primary eG𝑒𝑎𝑛𝑡4 𝛾 = 40 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 40 000
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 20 000
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟4 𝛾 = 6 000
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000
Radiator 𝛾 = 3 000
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 1 000
17
Comparison of Geant4 reg. spectrum without gap
rad/det with reg. spectrum of Radiator program
G𝑒𝑎𝑛𝑡4 𝛾 = 40 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 40 000
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 20 000
18
Comparison of Geant4 reg. spectrum without gap
rad/det with reg. spectrum of Radiator program
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟4 𝛾 = 6 000
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000
Radiator 𝛾 = 3 000
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 1 000
19
Comparison of Geant4 reg. spectrum including 2m He
pipe with reg. spectrum of Radiator program
G𝑒𝑎𝑛𝑡4 𝛾 = 40 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 40 000
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 20 000
20
Comparison of Geant4 reg. spectrum including 2m He
pipe with reg. spectrum of Radiator program
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟4 𝛾 = 6 000
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000
Radiator 𝛾 = 3 000
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000
R𝑎𝑑𝑖𝑎𝑡𝑜𝑟 𝛾 = 1 000
21
Comparison of Geant4 registered photon spectrum for
different energy of primary particles (including 2m He
pipe )
G𝑒𝑎𝑛𝑡4 𝛾 = 40 000 𝑒𝑙𝑒𝑐𝑡𝑟𝑜𝑛𝑠
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000 𝑒𝑙𝑒𝑐𝑡𝑟𝑜𝑛𝑠
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000 𝑚𝑢𝑜𝑛𝑠
G𝑒𝑎𝑛𝑡4 𝛾 = 1 800 𝑒𝑙𝑒𝑐𝑡𝑟𝑜𝑛𝑠
G𝑒𝑎𝑛𝑡4 𝛾 = 1 800 𝑚𝑢𝑜𝑛𝑠
22
Comparison of absorbed in XeCO2 energy summarized
per event for different energy of primary particles
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000 𝑒 −
G𝑒𝑎𝑛𝑡4 𝛾 = 1 800 𝑚𝑢𝑜𝑛𝑠
G𝑒𝑎𝑛𝑡4 𝛾 = 1 800 𝑒𝑙𝑒𝑐𝑡𝑟𝑜𝑛𝑠
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000 electrons
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000 𝑚𝑢𝑜𝑛𝑠
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000 𝑒 −
G𝑒𝑎𝑛𝑡4 𝛾 = 40 000 𝑒 −
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000 𝑒 −
23
Comparison of absorbed in XeCO2 energy of primaries
summarized per event for different energy of primary
particles (“saturation”?)
𝛾 = 40 000 𝑒 −
𝛾 = 20 000 𝑒 −
𝛾 = 6 000 𝑒 −
𝛾 = 3 000 e𝛾 = 3 000 𝑚𝑢 −
𝛾 = 1 800 𝑒 −
𝛾 = 1 800 𝑚𝑢 −
𝛾 = 1 000 𝑒 −
𝛾 = 40 000 000 𝑒 −
𝛾 = 4 000 000 𝑒 −
𝛾 = 400 000 𝑒 −
𝛾 = 200 e-
𝛾 = 100 𝑒 −
𝛾 = 10 𝑒 −
24
Comparison of Geant4 photon angular distributions
after radiator for different energy of primary particles
G𝑒𝑎𝑛𝑡4 𝛾 = 40 000 𝑒 −
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000 𝑒 −
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000 𝑒 −
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000 electrons
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000 𝑚𝑢𝑜𝑛𝑠
G𝑒𝑎𝑛𝑡4 𝛾 = 1 800 𝑒𝑙𝑒𝑐𝑡𝑟𝑜𝑛𝑠
G𝑒𝑎𝑛𝑡4 𝛾 = 1 800 𝑚𝑢𝑜𝑛𝑠
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000 𝑒 −
25
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 40 000 𝑒 −
Entries
26
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 40 000 eEntries
27
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000 𝑒 −
Entries
28
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000 𝑒 −
Entries
29
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000 𝑒 −
Entries
30
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000 𝑒 −
Entries
31
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000 𝑒 −
Entries
32
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000 𝑒 −
Entries
33
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000 𝑚𝑢𝑜𝑛𝑠
Entries
34
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000 𝑚𝑢𝑜𝑛𝑠
Entries
35
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 1 800 𝑒 −
Entries
36
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 1 800 𝑒 −
Entries
37
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 1 800 𝑚𝑢 −
Entries
38
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 1 800 𝑚𝑢 −
Entries
39
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000 eEntries
40
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000 eEntries
41
Thank you for your attention!
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Back-up
44
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 40 000
45
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 40 000
46
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000
47
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 20 000
48
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000
49
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 6 000
50
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000
51
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 3 000
52
Geant4 spectrum after radiator vs angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000
53
Geant4 absorbed spectrum (with 2m He pipe) vs
angular distribution
G𝑒𝑎𝑛𝑡4 𝛾 = 1 000
54