validation

Information about validation

Published on November 1, 2007

Author: Ming

Source: authorstream.com

Content

Electromagnetic physics validation:  Electromagnetic physics validation Katsuya Amako,Susanna Guatelli, Vladimir Ivanchenko, Michel Maire, Barbara Mascialino, Koichi Murakami, Sandra Parlati, Andreas Pfeiffer, Maria Grazia Pia, Takashi Sasaki, Lazslo Urban IEEE - NSS Rome, October 2004 Aim of the project:  Aim of the project Validation of Geant4 electromagnetic models against established references (ICRU - NIST) Simulation of physics quantities in the same experimental set-up as reference data Rigorous quantitative statistical comparison PHYSICAL TEST GOODNESS-OF-FIT TESTING Quantitative statistical analysis Geant4 Electromagnetic Physics models:  Geant4 Electromagnetic Physics models Alternative models for the same physics process High energy models fundamental for LHC experiments, cosmic ray experiments etc. Low energy models fundamental for space and medical applications, neutrino experiments, antimatter spectroscopy etc. two “flavours” of models: model based on Livermore libraries à la Penelope It handles electrons and positrons, gamma, X-ray and optical photons, muons, charged hadrons, ions multiple scattering bremsstrahlung ionisation annihilation photoelectric effect Compton scattering Rayleigh effect gamma conversion e+e- pair production synchrotron radiation transition radiation Cherenkov refraction reflection absorption scintillation fluorescence Auger Geant4 Electromagnetic Package Standard Package LowEnergy Package Muon Package Optical photon Package Slide4:  Photon Attenuation Coefficient Photon Cross Sections (attenuation coefficients with only one process activated) Electron CSDA range and Stopping Power (no multiple scattering, no energy fluctuations) Proton CSDA range and Stopping Power (no multiple scattering, no energy fluctuations) Alpha CSDA range and Stopping Power (no multiple scattering, no energy fluctuations) Physics quantities under study Elements: Be, Al, Si, Fe, Ge, Ag, Cs, Au, Pb, U + water Energy range: 1 keV – 10 GeV Testing activity has been automatised (INFN Gran Sasso Laboratory and KEK) Statistical analysis:  Statistical analysis The statistical analysis has been performed by means of a Goodness-of-Fit Statistical Toolkit The two hypothesis under study are the following: H0: Geant4 simulations = NIST data H1: Geant4 simulations ≠ NIST data GoF test (χ2 test) Distance between Geant4 simulations and NIST reference data Test result (p-value) GoF Toolkit Photon attenuation coefficient:  Photon attenuation coefficient Geant4 LowE Penelope Geant4 Standard Geant4 LowE EPDL NIST - XCOM Experimental set-up The three Geant4 models reproduce total attenuation coefficients with high accuracy The two Geant4 LowE models exhibit the best agreement Photoelectric cross section:  Photoelectric cross section p-value stability study Geant4 LowE Penelope Geant4 Standard Geant4 LowE EPDL NIST - XCOM The three Geant4 models reproduce photoelectric cross sections with high accuracy The two Geant4 LowE models exhibit the best agreement Geant4 LowE Penelope Geant4 Standard Geant4 LowE EPDL Slide8:  Compton scattering cross section The three Geant4 models reproduce Compton scattering cross sections with high accuracy The Geant4 LowE – EPDL model exhibits the best agreement Geant4 LowE Penelope Geant4 Standard Geant4 LowE EPDL NIST - XCOM Slide9:  Pair production cross section p-value stability study Z The three Geant4 models reproduce pair production cross sections with high accuracy The Geant4 LowE – EPDL model exhibits the best agreement Geant4 LowE Penelope Geant4 Standard Geant4 LowE EPDL NIST - XCOM Geant4 LowE Penelope Geant4 Standard Geant4 LowE EPDL Slide10:  Z Rayleigh scattering cross section Geant4 Penelope Geant4 LowE EPDL NIST - XCOM p-value stability study The Geant4 models seem to be in disagreement with the reference data Slide11:  The NIST database and the EPDL97 evaluated data library give Rayleigh cross section data in disagreement for E < 1 MeV EPDL97 is the most up-to- date, complete and consistent data library available at the moment (Zaidi, 2000). Rayleigh scattering cross section * Zaidi H., 2000, Comparative evaluation of photon cross section libraries for materials of interest in PET Monte Carlo simulation IEEE Transaction on Nuclear Science 47 2722-35 EPDL 97 NIST Slide12:  Electron Stopping Power H0 REJECTION AREA p-value stability study centre Experimental set-up p-value Z Geant4 LowE Penelope Geant4 Standard Geant4 LowE EEDL NIST - XCOM The three Geant4 models are equivalent Geant4 LowE Penelope Geant4 Standard Geant4 LowE EEDL Slide13:  Electron CSDA Range The three Geant4 models are equivalent CSDA range: particle range without energy loss fluctuations and multiple scattering Z p-value stability study Geant4 LowE Penelope Geant4 Standard Geant4 LowE EEDL NIST - XCOM Geant4 LowE Penelope Geant4 Standard Geant4 LowE EEDL Slide14:  Protons and alpha particles Comparison of Geant4 models with respect to ICRU 49 protocol Geant4 LowE Package has ICRU 49 parameterisations as one of its models verification, not validation The Ziegler parameterisations are as authoritative as the ICRU 49 reference comparison rather than validation Slide15:  Stopping Power and CSDA Range Geant4 LowE ICRU Geant4 Standard Geant4 LowE Ziegler 85 Geant4 LOWe Ziegler 2000 NIST PSTAR - ICRU 49 Proton stopping power Proton CSDA range Similar results for alpha particles Geant4 LowE ICRU Geant4 Standard Geant4 LowE Ziegler 85 Geant4 LOWe Ziegler 2000 NIST PSTAR - ICRU 49 Geant4 LowE ICRU Geant4 Standard Geant4 LowE Ziegler 85 Geant4 LOWe Ziegler 2000 NIST PSTAR - ICRU 49 p>0.05 p>0.05 Conclusions:  Conclusions Systematic validation of Geant4 electromagnetic models against ICRU protocols and NIST reference data Validation based on a rigorous, quantitative statistical analysis of test results All Geant4 electromagnetic models are in agreement with the reference data The Geant4 Low Energy Package is the most accurate with respect to the ICRU protocol More results: http://www.ge.infn.it/geant4/analysis/book Future: extend the validation test to other physics quantities

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