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Simulation of X-ray Fluorescence and Application to Planetary Astrophysics

IEEE NSS -- Portland, Thursday, Oct 23, 2003. Simulation of X-ray Fluorescence and Application to Planetary Astrophysics. A. Mantero, M. Bavdaz, A. Owens, A. Peacock, M. G. Pia. Basalt fluorescence spectrum Beam Energy 9.5 KeV. Counts. Energy (KeV).

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Simulation of X-ray Fluorescence and Application to Planetary Astrophysics

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  1. IEEE NSS -- Portland, Thursday, Oct 23, 2003 Simulation of X-ray Fluorescence and Application to Planetary Astrophysics A. Mantero, M. Bavdaz, A. Owens, A. Peacock, M. G. Pia

  2. Basalt fluorescence spectrum Beam Energy 9.5 KeV Counts Energy (KeV) IEEE NSS -- Portland, Thursday, Oct 23, 2003 The BepiColombo Mission to Mercury HERMES Is an X-Ray spectrometer to measure the composition of the upper layers of planetary surface Composed of 3 spacecrafts: 2 orbiters and a lander carrying 25 scientific experiments. • Magnetic Field Study • Planet Surface Mapping • Planet Surface Composition study • 4 spectrometer (IR, X, , n) • 1 laser altimeter • 1 lander (X-Ray Spectrometer, Imaging Camera, Seismometer) Alfonso.Mantero@cern.ch

  3. IEEE NSS -- Portland, Thursday, Oct 23, 2003 Basalt fluorescence spectrum Beam Energy 9.5 KeV Counts Energy (KeV) Alfonso.Mantero@cern.ch

  4. We need to simulate X-Ray fluorescence (1-10 KeV) from Mercury surface produced by solar radiation IEEE NSS -- Portland, Thursday, Oct 23, 2003 Fluorescence Simulation • Space missions are risky, so solid strategies for risk mitigation are to be undertaken • Preparing a correct and detailed simulation is a crucial part of these strategies • HERMES is an X-Ray spectrometer studying Mercury's surface composition Alfonso.Mantero@cern.ch

  5. Geant3 10 KeV EGS4 1 KeV • Low energy electromagnetic processes extensions until 100 eV • Advanced instruments for the description of geometry and materials IEEE NSS -- Portland, Thursday, Oct 23, 2003 Geant4 • “A toolkit for the simulation of the passage of particles through matter” • Object-Oriented technology • Developed following ISO 15504 software process implementing iterative-incremental model Alfonso.Mantero@cern.ch

  6. Unique interface to be used by any process Modularity permits a better management and easiness of expansion (Auger) The package has undergone both software and physical validation IEEE NSS -- Portland, Thursday, Oct 23, 2003 The Atomic Deexcitation Package Fluorescence and Auger emissions are simulated using data present on the EADL (Evaluated Atomic Deexcitation Library) from Livermore Alfonso.Mantero@cern.ch

  7. Unit Tests • Integration Tests • System Tests • Fluorescence • Auger IEEE NSS -- Portland, Thursday, Oct 23, 2003 Validation • Software Validation • Physical Validation Alfonso.Mantero@cern.ch

  8. Comparison between energy of simulated outflowing electrons and data found in literature Percent Error: 0.74 % ± 0.07 IEEE NSS -- Portland, Thursday, Oct 23, 2003 Physical Validation - Auger Simulation of Auger emission from pure materials irradiated by an electron beam with continuous ramp spectrum. Alfonso.Mantero@cern.ch

  9. Iceland Basalt Fluorescence Spectrum Pure Elements Counts Parametric analysis of data Full comparison with experimental data from rocks X-Ray irradiation (Bessy) Energy (keV) IEEE NSS -- Portland, Thursday, Oct 23, 2003 Physical Validation - Fluorescence Complex Materials Anderson-Darling • Goodness of Fit test • Doesn't depend upon data grouping • No symmetry needed • No cut on data number Many Peaks Physical Background Look B. Mascialino Data Analysis in HEP: A Statistical Toolkit 2003 NNS, Portland, Oregon, USA Alfonso.Mantero@cern.ch

  10. Anderson Darling results Preliminar analysis Pearson correlation: r>0.93 p<0.0001 High Statistical correlation Beam Energy 4.9 6.5 8.2 9.5 A2 0.04 0.01 0.21 0.41 Ac (95%) =0.752 Simulated Experimental Experimental and simulated X-Ray Spectra are statistically compatible at a 95% C.L. IEEE NSS -- Portland, Thursday, Oct 23, 2003 Physical Validation - Fluorescence Alfonso.Mantero@cern.ch

  11. The experimental set-up at the PTB laboratory at BESSY-II. The XRF chamber can be seen to be attached to the end of the Four Crystal Monochromator (FCM) beamline. Data for comparison have been taken during a test beam at BESSY laboratories. The application is CPU consuming, so it has been interfaced to the GRID thanks to the DIANE framework Si FCM beamline Si reference XRF chamber GaAs Execution Times are reduced of an order of magnitude (750 Mevents -> 24 Hours) A GEANT4 application has been created reproducing: • Experimental set-up • Materials • Detectors IEEE NSS -- Portland, Thursday, Oct 23, 2003 Application – DIANE talk: DIANE -- Distributed Analysis Environment for GRID-enabled Simulation and Analysis of Physics Data (Friday 24th October) Alfonso.Mantero@cern.ch

  12. IEEE NSS -- Portland, Thursday, Oct 23, 2003 Work In Progress Optimizationphase... Bepicolombo application: • New Geometries • Runtime Analysis Features (AIDA/ANAPHE) Alfonso.Mantero@cern.ch

  13. Predictive capability of deexcitation processes Use of Geant4 applications for Physic Reach studies and experimental set-up optimization Physic validation Geological material Geometry Detector IEEE NSS -- Portland, Thursday, Oct 23, 2003 Conclusions Full atomic deexcitation validation Alfonso.Mantero@cern.ch

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