Test & Analysis Project
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1 χ 2 N-S =23.2 ν=15 - p=0.08 χ 2 N-L =13.1 ν=20 - p=0.87 Test & Analysis Project Statistical Testing Physics Testing on behalf of the T&A team Geant4 Workshop, TRIUMF, September 2003
2 Physics Testing Project Electromagnetic Physics
3 Process Iterative and incremental, RUP-based Vision start with an initial set of basic electromagnetic tests use GoF component of HEPstatistics produce meaningful physics results role in physics and regression testing First cycle geant4/tests/test50 simple design (design iteration foreseen in near future) first set of meaningful results
4 Main User Requirements The test produces typical distributions of physical quantities of interest for testing a set of physical processes. The user shall be able to define electrons, positrons, antiprotons, pions, photons, ions. The experimental set-up (e.g.absorber size and material) can be changed by the user. The user shall be able to define position, direction, energy of primary particles. The user shall be able to define electromagnetic and hadronic processes. The user shall be able to choose different e.m. G4 Packages (Standard, LowE, Penelope) The user shall be able to switch on/off the individual physics processes. URD in
5 Test Design
6 Physics Tests Electromagnetic physics Standard, LowE, Penelope Hadronic physics Particle CSDA range Particle Stopping Power Transmission coefficient Backscattering coefficient Photon Attenuation coefficient Cross sections Particle range Bremsstrahlung energy spectrum Multiple scattering distributions Energy deposit in absorber Bragg peak (including hadronic interactions) etc.?
7 Test results Photon attenuation coefficient -ln ( gammatransmittedfraction / (targetthickness * absorberdensity) ) Absorber Materials: Be, Al, Si, Ge, Fe, Cs, Au, Pb, U
8 X-ray Attenuation Coefficient - Al χ 2 N-L=13.1 ν=20 - p=0.87 χ 2 N-S=23.2 ν=15 - p=0.08 NIST-XCOM G4 Standard G4 LowE
9 X-ray Attenuation Coefficient - Al χ 2 N-P=15.9 ν=19 p=0.66 NIST-XCOM G4 LowE Penelope
10 X-ray Attenuation Coefficient - Ge χ 2 N-L=26.3 ν=23 - p=0.29 χ 2 N-S=27.9 ν=23 - p=0.22 NIST-XCOM G4 Standard G4 LowE
11 X-ray Attenuation Coefficient - Ge χ 2 N-P=10.1 ν=21 - p=0.98 NIST-XCOM G4 LowE Penelope
12 X-ray Attenuation Coefficient - U χ 2 N-L=6.6 ν=20 - p=0.99 χ 2 N-S=14.7 ν=20 - p=0.80 NIST-XCOM G4 Standard G4 LowE
13 X-ray Attenuation Coefficient - U χ 2 N-P=19.3 ν=22 - p=0.63 NIST-XCOM G4 LowE Penelope
14 Test results Photon cross sections attenuation coefficients with only one process activated Absorber Materials: Be, Al, Si, Ge, Fe, Cs, Au, Pb, U
15 Compton Scattering - Al χ 2 N-L= 12.9 ν=8 - p=0.12 χ 2 N-S=8.7 ν=6 - p=0.19 NIST-XCOM G4 Standard G4 LowE
16 Compton Scattering - Al NIST-XCOM G4 LowE Penelope χ 2 N-P=2.5 ν=6 - p=0.87
17 Compton Scattering - Cs χ 2 N-L=4.6 ν=8 - p=0.80 χ 2 N-S=1.8 ν=8 - p=0.99 NIST-XCOM G4 Standard G4 LowE
18 Compton Scattering - Cs NIST-XCOM G4 LowE Penelope χ 2 N-P=4.6 ν=8 - p=0.80
19 Rayleigh Scattering - Al χ 2 N-L=13.6 ν=11 - p=0.26 NIST-XCOM G4 LowE
20 Rayleigh Scattering - Al NIST-XCOM G4 LowE Penelope χ 2 N-P=7.2 ν=8 - p=0.52
21 Rayleigh Scattering - Cs NIST-XCOM G4 LowE
22 Raleygh Scattering - Cs NIST-XCOM G4 LowE Penelope
23 Photoelectric Effect - Fe NIST-XCOM G4 Standard G4 LowE
24 Photoelectric effect - Fe NIST-XCOM G4 LowE Penelope
25 Photoelectric Absorption - Ge NIST-XCOM G4 Standard G4 LowE NIST-XCOM G4 LowE Penelope 2 compatible Monte Carlo are not necessarily the Truth!
26 Pair Production - Si NIST-XCOM G4 Standard G4 LowE
27 Pair Production Si NIST-XCOM G4 LowE Penelope
28 Test results CSDA range and Stopping Power for electrons - no multiple scattering - no energy fluctuations Absorber Materials: Be, Al, Si, Ge, Fe, Cs, Au, Pb, U
29 CSDA Range - Al NIST-ESTAR G4 Standard G4 LowE
30 CSDA Range - Pb NIST-ESTAR G4 Standard G4 LowE
31 Stopping Power - Al NIST-ESTAR G4 Standard G4 LowE
32 Stopping Power - Pb NIST-ESTAR G4 Standard G4 LowE
33 CSDA Range Al G4LowE Regression testing NIST-ESTAR Geant Geant
34 CSDA Range Pb G4Standard Regression testing NIST-ESTAR Geant Geant
35 Test results CSDA range and Stopping Power for protons - no multiple scattering - no energy fluctuations Absorber Materials: Be, Al, Si, Ge, Fe, Cs, Au, Pb, U
36 CSDA Range Al NIST-PSTAR G4 Standard G4 LowE
37 CSDA Range Al NIST-PSTAR G4 Standard G4 LowE
38 CSDA Range Pb NIST-PSTAR G4 Standard G4 LowE
39 Stopping Power Al NIST-PSTAR G4 Standard G4 LowE Ziegler
40 Stopping Power Pb NIST-PSTAR G4 Standard G4 LowE
41 CSDA Range Al G4LowE Regression testing NIST-PSTAR Geant Geant
42 CSDA Range Al G4LowE Ziegler Regression testing NIST-PSTAR Geant Geant
43 CSDA Range Al G4Standard Regression testing NIST-PSTAR Geant Geant
44 CSDA Range Pb G4LowE Regression testing NIST-PSTAR Geant Geant
45 CSDA Range Pb G4LowE Ziegler Regression testing NIST-PSTAR Geant Geant
46 CSDA Range Pb G4Standard Regression testing NIST-PSTAR Geant Geant
47 Test results Transmission
48
49 Angular distribution of transmitted electrons
50 Angular distribution of transmitted protons
51 Test results Backscattering for electrons and positrons Absorber Materials: Be, Al, Si, Ge, Fe, Mg, Ag, Au
52 Backscattering coefficient E=100keV Angle of incidence (with respect to the normal to the sample surface) = 0 Lockwood et al. (1981) G4 LowE
53 Backscattering coefficient E=1MeV Angle of incidence (with respect to the normal to the sample surface)=0 Lockwood et al. (1981) G4 LowE
54 Backscattering low energies - Au Note: experimental data often exhibit large differences!
55 Backscattering low energies - Al
56 Backscattering low energies - Si
57 Backscattering coefficient 30keV Coleman (1992) G4 LowE
58
59 Test results: Bragg peak, protons Absorber Material: water Geant e.m. Physics Comparison with experimental data from INFN, LNS Catania
60 Status and plans Present situation A set of basic e.m. tests and results is available CSDA range, stopping power, transmission, backscattering, Bragg Peak, angular distributions etc. Regression tests already done twice Evaluation of the computing resources needed see Sandra s talk in parallel session Plans Integration in the Geant4 general system testing Design iteration Complete test automation Extend test coverage e.m processes for ions, muons, atomic relaxation, add other e.m. physics distributions... hadronic physics Use more sophisticated algorithms of the GoF component
61 Conclusions A lot of progress since last year s workshop... a lot of work, but also a lot of fun! A group of bright, enthusiastic, hard-working young collaborators... Ground for Geant4 Physics Book
62 More at IEEE-NSS, Portland, October 2003 B. Mascialino et al., A Toolkit for statistical data analysis L. Pandola et al., Precision validation of Geant4 electromagnetic physics
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