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Building Radiation Shielding for Main Injector Collimation System

Design and implement radiation shielding for Main Injector collimation system using Beam Line Builder. Practical observations and advantages of using MMBLB for accurate modeling and reducing complexity. Detailed info output file BL_ELEMENTS provided.

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Building Radiation Shielding for Main Injector Collimation System

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  1. MAD-MARS Beam Line Builder and Main Injector collimation Igor Rakhno Accelerator Physics Department May 24, 2007

  2. Main Injector collimation at slip-stacking injection • There are 8 dipoles and ≈ dozen quads in the 200-m region. • Our goal was to design an appropriate radiation shielding for the region. • There is a primary collimator (thin tungsten plate) and 4 secondary ones (big structures).

  3. Practical observations • For a single dipole it might be makes sense to build the geometry model without MMBLB. • For two dipoles we could still work without MMBLB. • For three dipoles, from now on, I will use MMBLB.

  4. Advantages • If one makes an error in a model when using Non-standard geometry, it would be time-consuming to correct it for a model with 1000 spatial cells. MMBLB reduces the complexity of the entire model to the complexity of a single section. • An output file BL_ELEMENTS gives detailed info on the sections.

  5. Sample of BL_ELEMENTS type name s(cm) length(cm) NNON_min NNON_max DRIFT3 DRIFT0 5.00+00 5.00+00 1 2 Q230 Q230 3.00+02 3.05+02 3 15 …………….. ……………..

  6. Surface water activation

  7. Surface water activation

  8. Surface water activation – Q230 thru Q301

  9. Surface water activation

  10. Surface water activation – S2

  11. Surface water activation – S2

  12. Residual dose – Q230 thru Q301

  13. Residual dose – Q301

  14. Residual dose – Q301 thru Q310

  15. Absorbed dose – trim dipole H232

  16. Absorbed dose – S1

  17. Absorbed dose – S2

  18. Neutron spectra: Q301–S1 (red) and Q308–S1 (black)

  19. Neutron (black) and proton (red) spectra DS S1

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