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EFACEC - October 3-7 2005 Adolfo Aguilar

Sector Shielding analysis tool (SSAT) Computation Automation Using UNIX Awk and MSC/NASTRAN FEM model. EFACEC - October 3-7 2005 Adolfo Aguilar. Overview. Objective: Optimized Mass for the Electronics unit TID and Aluminium Shielding Map for PCBs

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EFACEC - October 3-7 2005 Adolfo Aguilar

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  1. Sector Shielding analysis tool (SSAT) Computation Automation Using UNIX Awk and MSC/NASTRAN FEM model EFACEC - October 3-7 2005 Adolfo Aguilar

  2. Overview • Objective: • Optimized Mass for the Electronics unit • TID and Aluminium Shielding Map for PCBs • Internal radiative environment definition for the equipment • Selection of appropriate electronics for the unit • Engineering approach to reduce analysis costs • Approach • Use of programming scripts to translate from FEM information to GEANT4 analysis • SPENVIS SHIELDOSE-2 - GEANT4 SSAT computation

  3. HARDWARE UNDER STUDY • Components Technology Test Bed (CTTB) • Two Units • Control Unit • Experiment Board (EB) Pallet • Limited Mass budget • EB Pallet located outside S/C • Mass optimization required

  4. ORBIT DEFINITION • Orbit Location

  5. GALILEO-IOV S/C • EB PALLET LOCATED OUSIDE S/C

  6. RADIATION ENVIRONMENT • SPENVIS SHIELDOSE-2 (Al-spheres) Analysis based on GALILEO orbit too pessimistic • 6 mm Al thickness for the desired TID on PCBs (50krad)

  7. GEANT4 DRAWBACKS • Physicist Oriented Tool • Lack of physical models explanation • Lack of definition of applicability limits • Very time consuming tool • Geometry definition demands a lot of workload • Output Results not directly applicable for engineering use • Too theoretical/ideal results • Not directly applicable to front-end electronics simulation • Lot of post-process required to be cost-effective

  8. FEM Model A source of Analysis Points A translation from FEM to GEANT4 is possible Each node in the FEM mode is the location of a target point for the analysis

  9. SECTORIAL ANALYSIS (GEANT4-SSAT) GEANT4 model for S/C and EB Pallet

  10. UNIX tools to translate FEM into GEANT4 • FEM models are ASCII based files • Node and connectivity definition is defined • Material and geometrical definition already coded • AWK, Perl, Phyton process can automate the task • Output results can be plotted using FEM postprocessors • PATRAN • IDEAS

  11. Sectorial Analysis for the PCBs • FEM Grids used as point target for the analysis • Shielding and TID map for each PCB • Very Fast and Efficient Method • From Geometry definition to post-process 3 days

  12. Post-Processed Results using PATRAN • TID Maps obtained for each location of the PCB • 3.5 mm (30krad) Al thickness reduced the mass

  13. Conclussions • GEANT4 needs a more engineering approach to be a cost effective tool for electronics/detectors design tool • Existing tools for FEM analysis can be used to optimize the analysis time • UNIX tools like AWK, Perl or Phyton can be used to translate FEM models information into GEANT4 analysis cases • Post-Process can be done using existing tools from the market like PATRAN or IDEAS. • A better understanding of the GEANT4 physical models is demanded with proper explanation of the applicability limits for better engineering use.

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