1 / 28

Status of Radiation Protection Studies for the Linac4 beam dumps

Status of Radiation Protection Studies for the Linac4 beam dumps. Joachim Vollaire DGS/RP. Outline. List of beam dumps for L4 commissioning and operation Shielding for12 MeV beam dump Shielding and strategy for 50 – 100 MeV dump Status of main dump shielding analysis (160 MeV )

iain
Download Presentation

Status of Radiation Protection Studies for the Linac4 beam dumps

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. Status of Radiation Protection Studies for the Linac4 beam dumps Joachim Vollaire DGS/RP

  2. Outline • List of beam dumps for L4 commissioning and operation • Shielding for12 MeV beam dump • Shielding and strategy for 50 – 100 MeV dump • Status of main dump shielding analysis (160 MeV) • Status of LBS/LBE dumps shielding analysis • Conclusions L4 BCC meeting # 31, 24/22/2011

  3. List of beam dumps for Linac4 • Temporary beam dumps for commissioning at different energies (12 MeV, 50 MeV and 100 MeV) • Main dump shielding with new layout and operational scenario (160 MeV) • LBS and LBE dumps (160 MeV) in the L4 transfer line (commissioning and measurements) L4 BCC meeting # 31, 24/22/2011

  4. 12 MeV beam dumps • 12 MeV beam (proton instead of H-) • Average current 6.5 mA (4.05x1013 p.s-1) • Operational scenario (4 weeks 12 h/day) @ 6.5 mA (4.06e13 pps) Beam Beam L4 BCC meeting # 31, 24/22/2011

  5. Residual dose rate 12 MeV beam dump 5 mn cooling time 1h cooling time 1day cooling time L4 BCC meeting # 31, 24/22/2011

  6. 50 MeV – 100 MeV beam dump • Re-location of the beam dump from the 50 MeV to the 100 MeV area • Move the dump with part of its shielding to limit personnel exposure • Best shielding material : lowest residual dose rate and activation of the surrounding structures • Operational scenario: • 1 Month of operation @ 800 W/1.6 kW for 50 / 100 MeV L4 BCC meeting # 31, 24/22/2011

  7. Geometry and studied configurations (I) • Shielding on a “Table” • Concrete bricks below the table (prevent tunnel activation) • Shielding on table would move with the dump… L4 BCC meeting # 31, 24/22/2011

  8. Geometry and studied configurations (II) • Steel (iron) good for high energy neutrons • Borated poly. (5 %) high thermal neutron capture cross section • Marble low activation, “shield” the shielding L4 BCC meeting # 31, 24/22/2011

  9. Neutron spectra out of the shielding • Configuration 2 leads to the lowest number of neutrons escaping the shielding • To confirm it is a good shielding looking at residual dose rate around the beam dump L4 BCC meeting # 31, 24/22/2011

  10. Example residual dose rate (8 h cooling) Configuration 1 Configuration 2 50 MeV commissioning Configuration 3 Configuration 4

  11. Example residual dose rate (8 h cooling) Configuration 5 Configuration 6 50 MeV commissioning Configuration 7 Meeting, Date

  12. Example residual dose rate (1 Week cooling) Configuration 1 Configuration 2 50 MeV commissioning Configuration 3 Configuration 4 Meeting, Date

  13. Example residual dose rate (1 Week cooling) Configuration 5 Configuration 6 50 MeV commissioning Configuration 7 L4 BCC meeting # 31, 24/22/2011

  14. Example residual dose rate (8 h cooling) Configuration 1 Horizontal cut Configuration 2 Horizontal cut 50 MeV commissioning Configuration 3 Horizontal cut Configuration 4 Horizontal cut L4 BCC meeting # 31, 24/22/2011

  15. Example residual dose rate (8 h cooling) Configuration 5 Horizontal cut Configuration 6 Horizontal cut 50 MeV commissioning Configuration 7 Horizontal cut L4 BCC meeting # 31, 24/22/2011

  16. Residual dose rate profile (1 day – 1 week) L4 BCC meeting # 31, 24/22/2011

  17. Residual dose rate profile (1 day – 1 week) L4 BCC meeting # 31, 24/22/2011

  18. Conclusions on shielding comparison Configuration 2 best combination for short cooling times Weight ~ 5000 kg L4 BCC meeting # 31, 24/22/2011

  19. Examples of use of Borated Poly and marble L4 BCC meeting # 31, 24/22/2011

  20. Dose rate during transport • Low after week of cooling. • Quick disconnection + shielding (lead) to “plug” the opening in the shielding L4 BCC meeting # 31, 24/22/2011

  21. Dose rate after 100 MeV run 1 month @ 50 MeV + 1 week CT 1 month @ 100 MeV + 1 week CT L4 BCC meeting # 31, 24/22/2011

  22. Status of main dump study • New operational scenario and core design • New fellow since 01/10/2011 (Jan Blaha) working on dump shielding Core Core + shielding (SS/BP/MB) L4 BCC meeting # 31, 24/22/2011

  23. Some preliminary results available L4 BCC meeting # 31, 24/22/2011

  24. Contact with RP colleagues in JPARC M. Vretenar Chamonix L4 BCC meeting # 31, 24/22/2011

  25. Status of LBE/LBS beam dumps Work carried out by H. Richter Gallery and adjacent building Access from Booster side L4 BCC meeting # 31, 24/22/2011

  26. Prompt dose calculations L4 BCC meeting # 31, 24/22/2011

  27. Residual dose rate calculation and optimization Residual H*(10)-rate [µSv/h] after commissioning (1h) Report being written L4 BCC meeting # 31, 24/22/2011

  28. Conclusions • Good progress for the commissioning dumps (12 / 50 / 100 MeV) • Main dump shielding still to be specified (assuming 1 core for the entire lifetime of the facility for the time being ?) • LBS dump study being documented. • LBE study to be performed…. L4 BCC meeting # 31, 24/22/2011

More Related