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Dose Mapping for the SIXS Module and X-ray detector BepiColombo Mission

This research focuses on simulating and mapping the dose received by the SIXS Module and X-ray detector in the BepiColombo mission. The study includes geometry description, material analysis, and simulations using the Sector Shielding Analysis Tool (SSAT). The results provide valuable insights for radiation hardness requirements of electronic components.

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Dose Mapping for the SIXS Module and X-ray detector BepiColombo Mission

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  1. Dose Mapping for the SIXS Module and X-ray detectorBepiColombo Mission F. García1, H. Andersson2, M. Roos2, K. Banzuzi2, A. Lehtolainen3, L. Alha3 and J. Huovelin3 1Helsinki Institute of Physics and University of Helsinki, Helsinki, Finland2Oxford Instrument Analytical Oy, Espoo, Finland3Observatory, University of Helsinki, Helsinki, Finland 7th GEANT4 Space Users’ WorkshopAugust 18 – 20, 2010 Seattle - USA

  2. OUTLINE • INTRODUCTION and MOTIVATION • SOLAR INTENSITY X-RAY and PARTICLE SPECTROMETER • GEOMETRY DESCRIPTION and MATERIALS • SSAT - SIMULATIONS and DOSE MAPPING • X-RAY DETECTOR • CONCLUSIONS • ACKNOWLEDGEMENTS 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 2

  3. INTRODUCTION BepiColombo is a joint mission between ESA and JAXA. It has been named after the Italian mathematician and engineer Giuseppe(Bepi) Colombo (1920-1984). He was a scientist who studied Mercury's orbital motion in detail as well as orbits and interplanetary travel in general. This is one of ESA’s Cornerstone missions, for the studying and understanding of the composition, atmosphere, magnetosphere and history of Mercury. Launch is expected for 2014 with a journey of about six years 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 3

  4. SIXS Module Mercury Planetary Orbiter (MPO) MOTIVATION STM (Structural and Thermal model) 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 4

  5. The Solar Intensity X-ray and Particle spectrometer SIXS Module 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 5

  6. SIXS Sensor Unit Particle Spectrometer The Solar Intensity X-ray and Particle spectrometer Three Silicon X-ray detectors and one CsI Particle Spectrometer 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 6

  7. Geometry Description and Materials CAD model was implemented in SolidWorks . Then the GDML file format was generated using Fastrad and ST-Viewer 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 7

  8. SSAT Simulations and Dose Mapping SSAT: The Sector Shielding Analysis Tool performs ray-tracing from a user-defined point within the a geometry to determine shielding levels 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 8

  9. SSAT Simulations and Dose Mapping, cont. Tests of the SSAT simulations with an Aluminium Sphere Total Dose: 22473 rad  224.73 Thickness: 1.3437 g/cm2  0.01 Radius: 0.4976 cm 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 9

  10. SSAT Simulations and Dose Mapping, cont. Top View Engineering Model Bottom View 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 10 2

  11. SSAT Simulations and Dose Mapping, cont. Top View Qualification Model of Particle Detector Main PCB Bottom View 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 11

  12. X-ray detector The are three of such detectors. One in the front of the SIXS has large aperture of 0.6 mm and two located on the sides with 0.3 mm. The components of such detector are: Be-window Ti-foil Collimator Si–detector Peltier cooler X-ray energy: 1 – 20 keV 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 12

  13. X-ray detector, cont X-ray tomography images Boxes are of 2 mm3 Aperture of the X-ray detector 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 13

  14. X-ray detector, cont From the DICOM images the isosurfaces were extracted and then exported to STL format. STL file was processed with the STL2GDML program and parsed into GEANT4. Here we observe the incident electron in red and the secondary photons in green This work has been done by the unconditional effort of Ben Masefield http://www.solveering.com/products/products_stl2gdml.html 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 14

  15. CONCLUSIONS • The Sector Shielding Analysis Tool (SSAT) has been tested with a rather complex CAD Geometry • The SSAT results for an Aluminium sphere were as expected • The dose mapping for the SIXS module has been obtained. • The X-ray tomography can be use to obtain the exact dimension of the aperture • A new package has been develop to generate GDML files from STL • The SSAT was a suitable tool for SIXS module R&D, because it gave us a good estimate for the radiation hardness requirements of the electronic components. 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 15

  16. ACKNOWLEDGEMENT This Research is conducted with TEKES (Finnish Founding Agency for Technology and Innovation) decision # 40355/06 for the University of Helsinki Thank you for your Attention 18-Aug-10 7th GEANT4 Space Users’ Workshop – Plenary Session II Apparatus Simulation F. García 16

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