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UJ56 Iron Shielding Attenuation

UJ56 Iron Shielding Attenuation. M. Brugger (FLUKA Team) 19.05.2010. Quick Calculation. We want to know the shielding attenuation for ‘High-Energy Hadron Fluence (>20MeV)’, thus unfortunately we can’t just take existing attenuation factors

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UJ56 Iron Shielding Attenuation

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  1. UJ56 Iron Shielding Attenuation M. Brugger (FLUKA Team)19.05.2010

  2. Quick Calculation • We want to know the shielding attenuation for ‘High-Energy HadronFluence (>20MeV)’, thus unfortunately we can’t just take existing attenuation factors • From other calculations we already knew that 40-70cm of Iron make us gain about a factor of 10 (in line-of-sight) • Instead of doing a full UJ56 calculation, we decided to make a generic calculation to check the respective attenuation and extrapolate to the required shielding for the safe room UJ56 Iron Shielding Attenuation

  3. ‘Foreseen Shielding’ UJ56 Shielding Option BLINDAGE UJ56 COMPLEMENT BRIQUETTES ACIER HAUTEUR 600mm MONORAIL 300mm RAIL DE MANUTENTION DES BLOCS DE BLINDAGE MUR FIXE ACIER HAUTEUR 2000mm 300mm xz view BLINDAGE ACIER DEMONTABLE EP. 400mm HAUTEUR 2000mm 400mm 800mm F. DELSAUX

  4. ‘What Do We Aim For’ Shielding effectiveness GND Floor ~10 109-1010cm-2y-1 Shielding effectiveness 1st Floor ~2 108-109cm-2y-1 ?107cm-2y-1? martin.gastal@cern.ch

  5. Generic Calculation UJ56 Iron Shielding Attenuation

  6. Attenuation Curve • Only line-of-sight! • Take Example of 70cm -> 1/10 only Factor Of 10 Factor Of 100 Factor Of 1000 UJ56 Iron Shielding Attenuation

  7. Conclusion • In addition to the 70cm on the tunnel side one would require about 100cm to reach <107cm-2y-1 • The contribution streaming from the top will then become dominant, thus most probably there is a limit reached earlier • A wall of 4x8x4m (U-shape) with 1m thickness and 3m height is about 50m3 -> almost 400t of iron? • One could do it possibly in ‘stages’ (as a function of LHC-evolution)? • A side note: 107cm-2y-1 still means that if there are 10 devices with a failure cross-section of 10-7, then there are 10 failures in this period UJ56 Iron Shielding Attenuation

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