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NSLS2 Bulk Shielding calculations Methodology

NSLS2 Bulk Shielding calculations Methodology. P.K. Job Radiation Physicist Peer Review 2007 March 27, 2007. Outline. Source Terms due to beamloss Radiation Attenuation Lengths Beamloss assumptions Bulk Shielding calculation Methodology Beam Stop Calculation Methodology

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NSLS2 Bulk Shielding calculations Methodology

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  1. NSLS2Bulk Shielding calculations Methodology P.K. Job Radiation Physicist Peer Review 2007 March 27, 2007

  2. Outline • Source Terms due to beamloss • Radiation Attenuation Lengths • Beamloss assumptions • Bulk Shielding calculation Methodology • Beam Stop Calculation Methodology • Skyshine Calculations

  3. Radiation Types Considered • Bremsstrahlung from electron beamloss • Bremsstrahlung produced neutrons by Giant Resonance Interaction • Bremsstrahlung produced high energy neutrons

  4. Bulk Shielding Calculational Tools • Swanson’s Empirical Method • Sullivan’s Modification (CERN) • Shield 11 Program Based on Empirical Method • EGS4 Monte Carlo Electron-Gamma Shower Program

  5. Empirical Method (Swanson)Radiation Dose Equivalent Factors Thick target bremsstrahlung source term due to electron beam loss as a function of scattering angle is given by Swanson

  6. Radiation Dose Equivalent Factors at 900(comparison)

  7. Empirical MethodRadiation Dose Equivalent Factors at 900(used for the calculations)

  8. Radiation Dose Equivalent Factors(used for the calculations) At 00 ( in the direction of the beam) = 8.3 E mrem.m2 / J In the forward direction (other than 00) = 0.85 rem.m2 / J These factors are same for all methods.

  9. Radiation Attenuation factors(comparison)

  10. Radiation Attenuation factors(used for the calculations)

  11. Storage Ring Beamloss Scenario 1

  12. Storage Ring Beamloss Scenario 2

  13. Storage Ring Beamloss Scenarios (Summary)

  14. Beamloss Scenarios used for Calculations

  15. Bulk Shielding Calculation Methodology

  16. Beam Stop Calculation Methodology

  17. Beam Stop Dimensions Fe Beam Stop Dimensions for the 3.5 GeV e- Beam (to Contain 99 % of the EM Shower) e-Beam 4.2 cm (3 M) Fe Cylinder 35 cm (20 X0)

  18. Skyshine Calculation Methodology

  19. Skyshine Estimates due to Booster Beam Stop

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