1 / 12

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)

leroy-alvarez
Download Presentation

Radiological Aspects of ILC

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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)

More Related