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Developments for Performance for Space Applications

Developments for Performance for Space Applications. G.Santin for the Geant4 Collaboration ESA / ESTEC Geant4 Review CERN, 16-20 April 2007. Several application domains in which Geant4 performance can be an issue Ground testing (accelerator, radioactive sources)

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Developments for Performance for Space Applications

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  1. Developments for Performance for Space Applications G.Santin for the Geant4 Collaboration ESA / ESTEC Geant4 Review CERN, 16-20 April 2007

  2. Several application domains in which Geant4 performance can be an issue • Ground testing (accelerator, radioactive sources) • Space radiation environment spectra • Microdosimetry in big spacecraft structures • Geant4 offers several variance reduction techniques (since several years) • Presented per application domain • Single particle (no collective effects)  Parallel / distributed computing • Local cluster / GRID • TOP-C, DIANE, … • Present developments  • More coherent VR framework to increase usability • Several new features (parallel geometries, more physics biasing, inverse MC, …) G.Santin - Performance for Space - Geant4 Review, CERN, 16-20 April 2007

  3. Features by application domain (1/2) Ground testing of space devices • Accelerators (thin target) • Cross section biasing • User implementations via G4VWrapperProcess • Hadronic physics • New Std EM developments • Forced interaction (implemented in HARP S/W) • Radioactive sources (soft spectrum, shielded sensitive volumes, late activation products) • RDM built-in biasing options • Decay branching ratios / nuclear splitting • Observation time window • Fast beta decay (“fbeta”) target G.Santin - Performance for Space - Geant4 Review, CERN, 16-20 April 2007

  4. Features by application domain (2/2) Space radiation environment spectra e.g. cosmic ray / solar / trapped radiation • Source biasing (GPS) • Position, Angular and Energy biasing • Multiple source biasing Big spacecraft structures (thick shield, micro-detectors) • Source biasing • Geometry biasing • Physics biasing (e.g. Brem splitting in e- environment) • Inverse Monte Carlo G.Santin - Performance for Space - Geant4 Review, CERN, 16-20 April 2007

  5. Space Engineering essential requirement Microdosimetry (electronics) from space environment in big structures Up to 102 precise calculations in ~ 1 hour (or less) Dose, Flux, Single Event Effects New transport equation, “adjoint” to the conventional “forward” transport equation Transport analogous to the forward one, but backward successive points are higher in energy, earlier in time Laurent Desorgher (Space IT) with ESA funding (REAT_MS 1 & 2) Geant4 Reverse MC G.Santin - Performance for Space - Geant4 Review, CERN, 16-20 April 2007

  6. Performance of the wholespace application development cycle Installation, migrations • Layered software structure • CLHEP • GMDL • Histogramming Considering reducing number of dependencies Geometry interfaces • CAD (STEP) ESA REAT-MS project (QinetiQ + subcontr.) • Tessellated solids (triangular/quadrangular facets) Up to 105 – 106 facets per model ! Performance improvement under study (QinetiQ, ESA) • GUI for geometry development (TRAD & eta_max, ESA) GDML output G.Santin - Performance for Space - Geant4 Review, CERN, 16-20 April 2007

  7. Backup G.Santin - Performance for Space - Geant4 Review, CERN, 16-20 April 2007

  8. “Adjoint” technique [Kalos 1968] New transport equation, “adjoint” to the conventional “forward” transport equation Transport analogous to the forward one, but backward successive points are higher in energy, earlier in time Suitable for Monte Carlo calculations Computations start at the detector and score at the source Possibility of computing doses at a point! Feasibility study (REAT_MS 1) G4 RMC Prototype for fast e- dose computation Only continuous energy loss and simple multiple scattering Completed Full implementation (REAT_MS 2) RMC in G4 for fast e- dose computation Backward simulation of : e- ionisation with delta production, continuous energy loss and multiple scattering Bremstrahlung, compton scattering, photo-electric effect In development - Release mid 2007 Geant4 Reverse MC Laurent Desorgher Space IT and Uni. Bern Proposed to be included in Geant4 release G.Santin - Performance for Space - Geant4 Review, CERN, 16-20 April 2007

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