Sector shielding analysis tool ssat computation automation using unix awk and msc nastran fem model
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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 Using UNIX Awk and MSC/NASTRAN FEM model

  • 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 Using UNIX Awk and MSC/NASTRAN FEM model

  • 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 Using UNIX Awk and MSC/NASTRAN FEM model

  • Orbit Location


Galileo iov s c
GALILEO-IOV S/C Using UNIX Awk and MSC/NASTRAN FEM model

  • EB PALLET LOCATED OUSIDE S/C


Radiation environment
RADIATION ENVIRONMENT Using UNIX Awk and MSC/NASTRAN FEM model

  • 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 Using UNIX Awk and MSC/NASTRAN FEM model

  • 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 Using UNIX Awk and MSC/NASTRAN FEM model

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) Using UNIX Awk and MSC/NASTRAN FEM model

GEANT4 model for S/C and EB Pallet


Unix tools to translate fem into geant4
UNIX tools to translate FEM into GEANT4 Using UNIX Awk and MSC/NASTRAN FEM model

  • 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 Using UNIX Awk and MSC/NASTRAN FEM model

  • 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 Using UNIX Awk and MSC/NASTRAN FEM model

  • TID Maps obtained for each location of the PCB

  • 3.5 mm (30krad) Al thickness reduced the mass


Conclussions
Conclussions Using UNIX Awk and MSC/NASTRAN FEM model

  • 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.