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

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Quick Calculation We want to know the shielding attenuation for High-Energy Hadron Fluence (>20MeV), thus unfortunately we cant 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 5/19/2010UJ56 Iron Shielding Attenuation2

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

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Shielding effectiveness GND Floor ~10 Shielding effectiveness 1 st Floor ~2 11/03/20104martin.gastal@cern.ch What Do We Aim For 10 9 -10 10 cm -2 y -1 10 8 -10 9 cm -2 y -1 ?10 7 cm -2 y -1 ?

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Generic Calculation 5/19/2010UJ56 Iron Shielding Attenuation5

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Attenuation Curve Only line-of-sight! Take Example of 70cm -> 1/10 only 5/19/2010UJ56 Iron Shielding Attenuation6 Factor Of 10Factor Of 100 Factor Of 1000

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Conclusion In addition to the 70cm on the tunnel side one would require about 100cm to reach <10 7 cm -2 y -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 50m 3 -> almost 400t of iron? One could do it possibly in stages (as a function of LHC-evolution)? A side note: 10 7 cm -2 y -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 5/19/2010UJ56 Iron Shielding Attenuation7

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