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Geant4 for GLAST BFEM

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Geant4 for GLAST BFEM. Comparison with Distributions in BFEM Data ... Uniform angular distribution (Steve Ritz's choice) Secondary g ... – PowerPoint PPT presentation

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Title: Geant4 for GLAST BFEM


1
  • Geant4 for GLAST BFEM
  • Comparison with Distributions in BFEM Data
  • T. Mizuno, H. Mizushima, S. Ogata, Y. Fukazawa
    (Hiroshima/SLAC)
  • M. Roterman, P. Valtersson (Royal Inst. of
    Tech/SLAC)
  • M. Ozaki (ISAS),
  • T. Handa, B. Giebels, T. Kamae (SLAC)
  • (Note)
  • This work is in progress and hence the report is
    preliminary.
  • (Contents)
  • Hit distributions in BFEM
  • Two Cosmic Ray Models with and without
    0.6sin(theta) term in albedo fluxes
  • Summary

2
Geant4 Simulation for BFEM A Chart
  • CR Generator
  • Primary p, e-, g
  • Uniform angular distribution
  • Secondary p, e-, e,m,m-
  • Angular distribution proportional to 1
    0.6sin(theta)
  • Uniform angular distribution (Steve Ritzs
    choice)
  • Secondary g
  • Angular distribution adjusted to Schoenfelder et
    al.
  • Physics Simulation (The fixes not implemented
    yet)
  • Digitization (w/charge sharing, w/o noise)
  • Conversion to IRF File
  • ROOTWriter (Thanks to Heather)
  • Analysis (Presented here)
  • Reconstruction (Yet to be done)

3
Magnetic Rigidity etc for Palestine TX
4
Downward Proton Flux for Palestine TX
5
Downward Electron Flux for Palestine TX
6
Downward and Upward Electron Fluxes
7
Upward Electron Flux for Palestine TX
8
Angular Distributions for Electrons
9
Upward Gamma Ray Flux
10
Angular Distribution for Gamma Rays
11
BFEM L1T Rate (G4 vs Real) for the Level Flight
Sharper earth rim with sin(theta) albedo
component
Total G4 L1T 517 Hz. (Real data 500 Hz)
contribution proton 219 Hz e- 77.9 Hz
e 46.2 Hz gamma 89.0 Hz mu- 32.8
Hz mu 52.7 Hz
Neutral 54.8 Hz. (real data 50 Hz)
contribution proton 5.14 Hz e- 8.09 Hz
e 4.68 Hz gamma 34.4 Hz mu- 1.09 Hz
mu 1.42 Hz
12
Hits in each layer (G4 vs Real) for charged
particles Sharper earth rim with sin(theta)
albedo component
Data
G4
13
Hits in each layer (G4) for all charged
particle species Sharper earth rim with
sin(theta) albedo component
14
Tot no. of layers hit (G4 vs Real) for charged
particles Sharper earth rim with sin(theta)
albedo component
G4
Data
15
Top-most layer hit (G4 vs Real) for charged
particles Sharper earth rim with sin(theta)
albedo component
Data
G4
16
Hits in each layer (G4 vs Real) for neutral
particles Sharper earth rim with sin(theta)
albedo component
G4
Data
17
Hits in each layer (G4) for all neutral
particle species Sharper earth rim with
sin(theta) albedo component
18
Tot no. of layers hit (G4 vs Real) for neutral
particles Sharper earth rim with sin(theta)
albedo component
G4
Data
19
Top-most layer hit (G4 vs Real) for neutral
particles Sharper earth rim with sin(theta)
albedo component
Data
G4
20
Study on CR protons and muons Sharper earth rim
with sin(theta) albedo component
  • We primarily want to find protons and muons. As
    these particles normally have
  • straight tracks we can apply the following cuts
  •  
  • Chi square of lt 0.01
  • Hit in ACD panels
  • Single tracks only
  • Number of hits in tracker layers
  •  
  • As we have missing silicon in top part of tracker
    we only look at bottom 16 layers.
  • The above cuts does not include interactions as
    they produce several recon tracks.

21
Study on CR protons and muons Top ACD and 8
layers Sharper earth rim with sin(theta) albedo
component
MC Protons Red MC Muons (- ) Yellow BFEM
data blue
22
Study on CR protons and muons All ACD and 8
layers Sharper earth rim with sin(theta) albedo
component
MC Protons Red MC Muons (- ) Yellow BFEM
data blue
23
Study on CR protons and muons All ACD and 4
layers Sharper earth rim with sin(theta) albedo
component
MC Protons Red MC Muons (- ) Yellow BFEM
data blue
24
Study on CR protons and muons All side ACD and 4
layers Sharper earth rim with sin(theta) albedo
component
MC Protons Red MC Muons (- ) Yellow BFEM
data blue
25
BFEM L1T Rate (G4 vs Real) for the Level Flight
Sharper earth rim without sin(theta) albedo
component
Total L1T 448 Hz. (real data 500 Hz)
contribution proton 210 Hz e- 53.7 Hz
e 32.2 Hz gamma 89.0 Hz mu-
22.7 Hz mu 40.7 Hz
Neutral 50.1 Hz. (real data 50 Hz)
contribution proton 4.55 Hz e- 5.24 Hz
e 3.46 Hz gamma 34.4 Hz mu-
0.609 Hz mu 1.85 Hz
26
Hits in each layer (G4 vs Real) for charged
particles Sharper earth rim without sin(theta)
albedo component
Data
G4
27
Hits in each layer (G4) for all charged
particle species Sharper earth rim without
sin(theta) albedo component
28
Tot no. of layers hit (G4 vs Real) for charged
particles Sharper earth rim without sin(theta)
albedo component
Data
G4
29
Top-most layer hit (G4 vs Real) for charged
particles Sharper earth rim without sin(theta)
albedo component
Data
G4
30
Hits in each layer (G4 vs Real) for neutral
particles Sharper earth rim without sin(theta)
albedo component
Data
G4
31
Hits in each layer (G4) for all neutral
particle species Sharper earth rim without
sin(theta) albedo component
32
Tot no. of layers hit (G4 vs Real) for neutral
particles Sharper earth rim without sin(theta)
albedo component
G4
Data
33
Top-most layer hit (G4 vs Real) for neutral
particles Sharper earth rim without sin(theta)
albedo component
Data
G4
34
  • Conclusion Geant4 for BFEM
  • Comparison with Distributions in BFEM Data
  • (Note)
  • This work is in progress and hence the report is
    preliminary.
  • (Conclusion)
  • Hit distributions are a powerful way to study the
    CR composition and angular distribution.
  • More soft electrons/positrons(Elt 20MeV?) to fill
    the lower portion of the Tracker.
  • Sharpness of the Earth Rim (as a source of soft
    gamma rays) BFEM may give a useful measurement!
  • Strength of the sin(theta) component BFEM may
    give a constraint!.
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