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Radiological Aspects of ILC

2 nd Workshop of Korean ILC at PAL. Radiological Aspects of ILC. 2004. 12. 28. Hee-Seock Lee Pohang Accelerator Laboratory. High Power, High Energy Electron Accelerator, ILC. Underground Facility (Natural Shield : 20 m for TESLA, 30 m for ILS)

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Radiological Aspects of ILC

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  1. 2nd Workshop of Korean ILC at PAL Radiological Aspects of ILC 2004. 12. 28. Hee-Seock Lee Pohang Accelerator Laboratory

  2. High Power, High Energy Electron Accelerator, ILC • Underground Facility (Natural Shield : 20 m for TESLA, 30 m for ILS) • Near Resident Area ( long facility ~ 30 km) • Limited No. of Access Point • Air Conditioning System with Long Path • Water & Cooling System • High Power Beam Dump (10 ~ 20 MW, e-beam dump, Bremsstrahlung photon dump) • Huge IP (Interaction Point)

  3. Radiological Impacts of ILC • EM Shower, Photonuclear, SR, Hadron • Primary Radiation • Secondary Radiation • Muon (LSoil = 400 m for 250 GeV ) • Residual Activity • Environmental Problem • Beam Dump • Radiation Damage Shielding

  4. Radiation for Radiation Worker • Tunnel Concrete Activation • Equipment Activation • Activated Air near Access Point(AP) • Activated Coolant in/out of Tunnel • Shielding at AP • One tunnel or Two tunnel (Access & Rescue)

  5. Radiation for Publics & Environments • Activated Air near Access Points • Soil Activation • Ground Water Activation • Tritium & Be-7 Shielding TESLA

  6. Air & Coolant Activation • Air (near IP) • Short Half-life Radioisotopes : C-14, N-13, O-15 • Open Loop (long distance from release point) • Closed Loop (3 h cooling time after 1 month Op, 100 kW) • Water Coolant (Specially, Dump) • Tritium, Be-7 : Control of NPP Level for 1st coolant • Helium • Tritium : negligible for average loss of 0.1 W/m)

  7. High Power Beam Dump • Mechanical Issues • 10 ~ 20 MW, preventing leakage • Residual Activity around Beam Dump • Coolant Activation • Fail-safe • Interlock • Heavy Local Shield to reduce Env. Problems • Large Hall & Many Beam Dumps of ILC • Dump for Beam and Bremsstrhalung Photon

  8. Water Dump • In ILC, One dump for e-beam and bremsstrahlung photon • No Vacuum Trouble SLAC type Beam Dump for ILC Beam Dump for TESLA

  9. Collimations and Damages • Multi-stage collimators and Magnetized Iron Spoilers • Life-times of Equipments and Detectors

  10. Other Issues and Accidents • Radiation Monitoring System distributed along long facility : Budget & Operation • Publics always exist over the accelerator • Accidents • Cooling Water Leakage • Melting and Evaporation of Activated Materials • Access Control Fail

  11. Recent Activities • KEK : Study on High Power Beam Dump • Fermi : Collimation and Background(BDIR) • TESLA : General Safety Analysis (Dump and problems near dump are not declared) • KEK & PAL • 2, 2.5 GeV Electron Beam • Photonuclear Reaction Study • Activation Study of Low Activity Concrete • Activity around Water Dump • Since 2003(1998)

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