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Neutron Wall Loading Profile Using CAD/MCNP Interface and (progress report)

Neutron Wall Loading Profile Using CAD/MCNP Interface and (progress report). Mengkuo Wang ARIES Meeting June 16-17, 2004 University of Wisconsin - Madison. Introduction. Current Problem of MCNP Not user friendly (input, visualization of geometric model and output)

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Neutron Wall Loading Profile Using CAD/MCNP Interface and (progress report)

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  1. Neutron Wall Loading Profile Using CAD/MCNP Interface and (progress report) Mengkuo Wang ARIES Meeting June 16-17, 2004 University of Wisconsin - Madison

  2. Introduction • Current Problem of MCNP • Not user friendly (input, visualization of geometric model and output) • Limited geometry/surface types • Compatibility • In many cases, CAD model exists before Monte Carlo simulation • CAD: Focus on Geometry, includes the achievements in geometry modeling and computational geometry • Geometry engine can be imported to other software • ACIS • No duplicated work

  3. Why not Converter? CAD file • Pros: • Focus is on input compatibility issues • No major modifications required for Current Monte Carlo Method • Cons: • Suffer all the other limitations of Current Monte Carlo Method • Limited geometry type • Impossible 100% convert • Hard to add new geometry type • Always need update to catch the CAD software Converter Input file MCNP

  4. CAD based MCNP ACIS geometry file Physics input file CAD Geometry engine CAD based MCNP CAD geometry engine (CGM) MCNP Ray object intersection

  5. First step: torus Plasma Surface First Wall First Wall divided poloidally into 15 degree bins

  6. Analyzed Effect of Neutron Source Profile on Neutron Wall Loading Distribution • Options: • Uniform Source • Line Source at magnetic axis (Shifted line source) • Actual Source (from J.Lyon)

  7. Rminor Rmajor r shift Major Radius and Plasma shift Rmajor=8.25 m Rminor=1.85 m 31cm Plasma

  8. Actual Neutron Source Profile • the neutron production rate (in )

  9. Peak IB and OB values differ by 15% - 20%

  10. Result Differ by ~3% for 5cm SOL

  11. 3FP Stellerator Model

  12. Problem: First Wall overlap with Plasma suface Green: Plasma Surface Yellow: First Wall Possible reason: Offset function in CAD or Convert to ACIS

  13. Wall subtract Plasma Surface

  14. Temporary Solution: use plasma surface to estimate wall loading • Horizon and toroidal subdivision

  15. Use whole model for calculations

  16. Future Plan • Fix the geometry errors • Speed up calculations • Construct the good first wall

  17. 9 Xns of Plasma Boundary (red) and WP Center (green) Covering 1/2 Field Period (~9 m) 3 FP Configuration max~ 4.6 m  peaks @ ~3 MW/m2 at black dot Beginning of Field Period min= 1.2 m  = 0  = 60 Middle of Field Period

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