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Radiation protection consideration for the IR upgrade

Radiation protection consideration for the IR upgrade. Doris Forkel-Wirth, Markus Fuerstner , Stefan Roesler. Overview. Introduction Dose limits and ALARA Example: Job planning Residual dose rates Simulation parameters Tunnel Inner triplet (Q1) TAS TAN Summary. Area classification.

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Radiation protection consideration for the IR upgrade

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  1. Radiation protection consideration for the IR upgrade Doris Forkel-Wirth, Markus Fuerstner, Stefan Roesler

  2. Overview • Introduction • Dose limits and ALARA • Example: Job planning • Residual dose rates • Simulation parameters • Tunnel • Inner triplet (Q1) • TAS • TAN • Summary LHC Interaction Regions Upgrade - Phase-I

  3. Area classification LHC Interaction Regions Upgrade - Phase-I

  4. ALARA LHC Interaction Regions Upgrade - Phase-I

  5. required recommended LHC Interaction Regions Upgrade - Phase-I

  6. CERN-SC-2005-093-RP-TN Example 1: IR7 – Job Doses LHC Interaction Regions Upgrade - Phase-I

  7. CERN-SC-2005-093-RP-TN Example 1: IR7 – Job Doses LHC Interaction Regions Upgrade - Phase-I

  8. FLUKA simulation • Nominal LHC operation • Continuous operation for 180 days • Average inelastic interaction rate 109 s-1 • pp interaction- DPMJET3 • Magnetic field • CMS analytical solenoid field (*) 4 T • Inner triplet field maps (**) • Sep. dipole constant field 1.38 T • Cooling times • 1 hour, 8 hours, 1 week, 1 month, 4 month (*) Analytical solenoid updated by Francesco Cerrutti AB/ATB (**) Field maps from Christine Hoa AT/MAS LHC Interaction Regions Upgrade - Phase-I

  9. TAS - Inner triplet - Dipole - JSCAA - TAN FLUKA simulation (geometry) TAS + inner triplet from Christine Hoa AT/MAS LHC Interaction Regions Upgrade - Phase-I

  10. Residual dose rate IP5 LHC Interaction Regions Upgrade - Phase-I

  11. Aisle Residual dose rate 50 µSv/h LHC Interaction Regions Upgrade - Phase-I

  12. TAS Residual dose rateTAS ~70 mSv/h ~15 mSv/h TAS surface ~10 mSv/h ~5 mSv/h LHC Interaction Regions Upgrade - Phase-I

  13. Q1 Residual dose rate Q1 ~2.5 mSv/h ~1 mSv/h Cryostat surface ~0.4 mSv/h ~0.2 mSv/h LHC Interaction Regions Upgrade - Phase-I

  14. TAN Residual dose rate TAN - 1 Aisle ~ 1 mSv/h ~ 0.6 mSv/h ~ 0.2 mSv/h ~ 0.4 mSv/h LHC Interaction Regions Upgrade - Phase-I

  15. TAN Residual dose rate TAN - 2 Aisle 70 µSv/h TAN Aisle LHC Interaction Regions Upgrade - Phase-I

  16. Summary • Detailed residual dose rate maps were calculated allowing to optimize the interventions in terms of dose to personnel. • The dose rate maps can be verified with monitors of the RAMSES system (e.g. PMI) installed in the tunnel. • The area around the TAN, inner triplet and TAS will be highly radioactive. It will most likely be classified as limited-stay or high radiation areas. All installation will have to follow the rules and guidelines associated with such areas. • Optimization and the ALARA principle (are) will be essential parts of the design, operation and dismantling of any new accelerator, experiment or facility. During all phases in the life-cycle of the installation clear documentation is required that optimization rules have been followed. • Many open questions exist regarding the interventions, such as detailed intervention plans, individual and collective doses … LHC Interaction Regions Upgrade - Phase-I

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