the study of radiation effects is fundamental to the feasibility of interplanetary missions

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Geant4 - INFN Genova Group - [email protected] The study of radiation effects is fundamental to the feasibility of interplanetary missions Crucial point: Crucial point: how to model physics how to model physics interactions? interactions? The Geant4 Toolkit provides many alternative and complementary approaches and models (e.g. Parameterised and theory driven approaches, Bertini and Binary Cascade models, etc.) Hadronic physics validation of Geant4 Geant4 simulations are the Geant4 simulations are the primary tool to evaluate primary tool to evaluate quantitatively the effects of quantitatively the effects of the space radiation the space radiation environment environment Which model is more suitable? Are these models reliable?

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Which model is more suitable? Are these models reliable?. Hadronic physics validation of Geant4. The study of radiation effects is fundamental to the feasibility of interplanetary missions. - PowerPoint PPT Presentation

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Page 1: The study of radiation effects is fundamental to the feasibility of interplanetary missions

Geant4 - INFN Genova Group - [email protected]

The study of radiation effects is fundamental to the feasibility of interplanetary missions

Crucial point:Crucial point:how to model physics how to model physics interactions?interactions?

The Geant4 Toolkit provides many alternative and complementary approaches and models(e.g. Parameterised and theory driven approaches, Bertini and Binary Cascade models, etc.)

Hadronic physics validation of Geant4

Geant4 simulations are the primary Geant4 simulations are the primary tool to evaluate quantitatively the tool to evaluate quantitatively the effects of the space radiation effects of the space radiation environmentenvironment

Which model is more suitable?Are these models reliable?

Page 2: The study of radiation effects is fundamental to the feasibility of interplanetary missions

Geant4 - INFN Genova Group - [email protected]

Systematic, rigorous, quantitative Systematic, rigorous, quantitative validation of Geant4 hadronic physics validation of Geant4 hadronic physics

modelsmodelsAs:As:• Energy spectraEnergy spectra• Particle multiplicities Particle multiplicities • Scattering anglesScattering angles• etc.etc.

Hadronic physics validation of Geant4

against reliable physics against reliable physics referencesreferences

Similar approach as in Geant4 Similar approach as in Geant4 electromagnetic physics validationelectromagnetic physics validation

A systematic, statistically rigorous A systematic, statistically rigorous validation of Geant4 hadronic physics validation of Geant4 hadronic physics is missing at the present time. is missing at the present time.

Page 3: The study of radiation effects is fundamental to the feasibility of interplanetary missions

Geant4 - INFN Genova Group - [email protected]

Geant 4 extensiondown to the electronvolt scale

• Simulation of electromagnetic interactions down to Simulation of electromagnetic interactions down to low energies is an important issue for space missions low energies is an important issue for space missions to Mars:to Mars:• Radiation effects on electronics and science instruments are critical

to the successful operation of missions• Possible biological effects of radiation on human tissues can

compromise the astronauts’ health and the mission feasibility

• Currently, Geant4 provides a specialized package to Currently, Geant4 provides a specialized package to simulate low energy electromagnetic interactionssimulate low energy electromagnetic interactions– Models are based on the assumption that the atoms of the material

subject to particle interaction are free– This approximation is no more valid below 100-200 eV

• An extension of Geant4 physics capabilities below this An extension of Geant4 physics capabilities below this energy range requires a novel modeling approachenergy range requires a novel modeling approach

Page 4: The study of radiation effects is fundamental to the feasibility of interplanetary missions

Geant4 - INFN Genova Group - [email protected]

Geant 4 electromagneticphysics validation

• Current models have been extensively validated w.r.t. the NIST database (cross sections and stopping powers)– A rigorous statistical analysis has been performed with the

Statistical Toolkit developed in the ESA SEPTIMESS project

• Extend rigorous validation of Geant4 for Extend rigorous validation of Geant4 for electromagnetic physics models electromagnetic physics models – Below 1 KeVBelow 1 KeV– Over 10/100 GeV (not covered by NIST)– Final state generation (spectra, angular distributions)

• Provide guidance to users about the selection of electromagnetic physics models to be instantiated in a Physics List