sector shielding analysis tool ssat computation automation using unix awk and msc nastran fem model
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EFACEC - October 3-7 2005 Adolfo Aguilar

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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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sector shielding analysis tool ssat computation automation using unix awk and msc nastran fem model

Sector Shielding analysis tool (SSAT) Computation Automation Using UNIX Awk and MSC/NASTRAN FEM model

EFACEC - October 3-7 2005

Adolfo Aguilar

overview
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
hardware under study
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
orbit definition
ORBIT DEFINITION
  • Orbit Location
galileo iov s c
GALILEO-IOV S/C
  • EB PALLET LOCATED OUSIDE S/C
radiation environment
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)
geant4 drawbacks
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
fem model a source of analysis points
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

sectorial analysis geant4 ssat
SECTORIAL ANALYSIS (GEANT4-SSAT)

GEANT4 model for S/C and EB Pallet

unix tools to translate fem into geant4
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
sectorial analysis for the pcbs
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
post processed results using patran
Post-Processed Results using PATRAN
  • TID Maps obtained for each location of the PCB
  • 3.5 mm (30krad) Al thickness reduced the mass
conclussions
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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