nsls2 bulk shielding calculations methodology
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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NSLS2Bulk Shielding calculations Methodology
P.K. JobRadiation PhysicistPeer Review 2007
March 27, 2007
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Outline
• Source Terms due to beamloss• Radiation Attenuation Lengths• Beamloss assumptions• Bulk Shielding calculation Methodology• Beam Stop Calculation Methodology• Skyshine Calculations
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Radiation Types Considered
• Bremsstrahlung from electron beamloss• Bremsstrahlung produced neutrons by Giant Resonance
Interaction• Bremsstrahlung produced high energy neutrons
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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
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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
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Radiation Dose Equivalent Factors at 900
(comparison)
Radiation Component
Dose equivalent factors(mrem.m2/J)
(Swanson)
Dose equivalent factors(mrem.m2/J)(Sullivan)
Dose equivalent factors(mrem.m2/J)(Shield 11)
Bremsstrahlung 2.80 1.39 1.12
Giant Resonance Neutrons
0.63 0.27 0.257
High Energy Neutrons
0.075 0.043 0.068
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Empirical MethodRadiation Dose Equivalent Factors at 900
(used for the calculations)
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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.
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Radiation Attenuation factors(comparison)
Radiation Component
Shielding Material
AttenuationLength (Hub)(g / cm2)
AttenuationLength (Shiel)(g / cm2)
Bremsstrahlung ConcreteLeadIron
492537
4224
33.6
Giant Resonance Neutrons
ConcreteLeadIron
40161100
309747
High Energy Neutrons
Concrete
LeadIron
65115191138
55120200145
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Radiation Attenuation factors(used for the calculations)
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Storage Ring Beamloss Scenario 1
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Storage Ring Beamloss Scenario 2
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Storage Ring Beamloss Scenarios (Summary)
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Beamloss Scenarios used for Calculations
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Bulk Shielding Calculation Methodology
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Beam Stop Calculation Methodology
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Beam Stop Dimensions
Fe Beam Stop Dimensions for the 3.5 GeV e- Beam(to Contain 99 % of the EM Shower)
35 cm (20 X0)
4.2 cm (3 M)e- Beam Fe Cylinder
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Skyshine Calculation Methodology
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Skyshine Estimates due to Booster Beam Stop