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Geant4 Model of SIXS Particle Instrument and Preliminary Simulation Results

Geant4 Model of SIXS Particle Instrument and Preliminary Simulation Results. Lehti, J. (ASRO) Valtonen, E. (ASRO) Vainio, R. (University of Helsinki). jussi.lehti@asro-space.com. Outline. SIXS particle instrument Geant4 model of SIXS Simulations results Future plans. BepiColombo - SIXS.

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Geant4 Model of SIXS Particle Instrument and Preliminary Simulation Results

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  1. Geant4 Model of SIXS Particle Instrument and Preliminary Simulation Results Lehti, J. (ASRO) Valtonen, E. (ASRO) Vainio, R. (University of Helsinki) jussi.lehti@asro-space.com Geant4 Workshop, Leuven, Belgium

  2. Outline • SIXS particle instrument • Geant4 model of SIXS • Simulations results • Future plans Geant4 Workshop, Leuven, Belgium

  3. BepiColombo - SIXS • BepiColombo mission • ESA cornerstone mission to Mercury • Launch 2012 • Five years’ cruise phase, one year operation at orbit • Double S/C mission: • Mercury Planetary Orbiter (MPO) • three-axis stabilized • z-axis nadir pointing • 400 x 1500 km orbit • Mercury Magnetospheric Orbiter (MMO) • SIXS Experiment • Solar Intensity X-ray and particle Spectrometer onboard MPO • Scientific objectives: • Provide the primary solar radiation spectrum for X-ray fluorescence measurements • Study coronal X-ray and energetic particle emission Geant4 Workshop, Leuven, Belgium

  4. SIXS Particle Instrument • SIXS Particle Instrument • 2π sr Field-of-View around anti-nadir with Geometric Factor of ~ 0.1 cm2 sr • Five GaAs surface detectors around a HgI2 core detector • Measures • 0.1 - 3 MeV electrons • 1 - 30 MeV protons • ΔE/E ~ 50 % energy channel separation • coarse directional resolution • 64-s/1-s time resolution Geant4 Workshop, Leuven, Belgium

  5. Geant4 model (1/2) • Geometry • Core detector • 4x4x4 mm3 • Mercuric iodide (HgI2) • Side detectors • Thickness 50 μm • Gallium Arsenide (GaAs) • Supporting structure • Aluminum • G4Box solids (16 pcs) • Foils above side detectors • Thickness 25 μm • Beryllium Screen capture from VRML browser Geant4 Workshop, Leuven, Belgium

  6. Geant4 model (2/2) • Physics • LE EM package • Output • Ascii file • CSV • Human readable • Easy to read with different analysis software • Energy losses and incident direction Geant4 Workshop, Leuven, Belgium

  7. Special case SimulationsElectron and proton separation • Particle identification is based on ΔE/E method Geant4 Workshop, Leuven, Belgium

  8. Intensity ~1.4 MeV Energy SimulationsElectron and proton separation • Special case: • Particles do not trigger the core detector  Separation is not possible • Solution: • Reduce from the detected intensity the intensity of the protons which stopped in the side detector Geant4 Workshop, Leuven, Belgium

  9. electrons protons SimulationsElectron and proton separation Geant4 Workshop, Leuven, Belgium

  10. SimulationsEnergy resolution • Isotropic and beam particle sources • Beam represents a “perfect” collimation • Detected energy channels are normalized to unity • X-, Y-, Z-axes are logarithmic • Ideal instrument  line Geant4 Workshop, Leuven, Belgium

  11. Future plans • Geometric factor and response function simulations • Use the model to improve performance of the instrument • More detailed geometry implementation • More realistic particle sources, e.g. real intensity spectra, anisotropies Geant4 Workshop, Leuven, Belgium

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