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RECENT RADIATION STUDIES ON THE BDIR, DUMPS, LINAC AND TEST FACILITIES

Energy Deposition/Accelerator Physics. Fermilab. RECENT RADIATION STUDIES ON THE BDIR, DUMPS, LINAC AND TEST FACILITIES. Nikolai Mokhov Noriaki Nakao Sergei Striganov Fermilab. ILC BDS Meeting June 30, 2006. OUTLINE. BDS, Extraction and Beam Dumps Backgrounds in SiD Detector

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RECENT RADIATION STUDIES ON THE BDIR, DUMPS, LINAC AND TEST FACILITIES

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  1. Energy Deposition/Accelerator Physics Fermilab RECENT RADIATION STUDIES ON THE BDIR, DUMPS, LINAC AND TEST FACILITIES Nikolai Mokhov Noriaki Nakao Sergei Striganov Fermilab ILC BDS Meeting June 30, 2006

  2. OUTLINE • BDS, Extraction and Beam Dumps • Backgrounds in SiD Detector • Bent Crystals at ATF2 and Tevatron • SMTF Test Facility • Main Linac Cryomodule • NIU Beam Diagnostics Laboratory Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  3. Thorough Modeling of BDS Collimation & Extraction • Synchrotron radiation and performance of collimation and extraction • systems (STRUCT, A. Drozhdin and X. Yang). • Simulations and benchmarking of collimation system with BDSIM, MARS15 and STRUCT (with UK and SLAC colleagues). • Model refinement and further simulations of radiation loads and radiation environment in BDS, IP and extraction (MARS15). • Masks and extraction beam dumps (MARS15). Consider marble on most collimators Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  4. Water and Liquid Sodium Dumps Verification for 250-GeV 12-MW e-beam on water dump (R=0.6m, L=10m) TESLA TDR MARS15 250-GeV 11-MW e-beam on water and sodium dumps (MARS15) Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  5. Muon Spoilers in BDS Tunnel Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  6. BDS Background in SiD Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  7. IP & BDS Backgrounds in SiD STRUCT + MARS15 + SLIC + LCDD + PYTHIA HCAL Endcap hit rates: Red – BDS (no spoilers) Green – BDS (w/spoilers) Blue – e+e- events Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  8. Bent Crystal Experiment at ATF2 • On June 1, 2006, ATF-TB has accepted the proposal to set up a bent crystal at ATF beam dump • They want us to estimate radiation when the beam hits our setup from the radiation safety point of view • We need an estimate by next ATF-IB meeting in Vancouver in July • Simulations will be performed with MARS15 at Fermilab and (hopefully) with GEANT4 at Hiroshima University • KEK and Hiroshima team will come to Fermilab for crystal collimation • experiments at Tevatron in November-December Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  9. Beam Dump and Beam Loss in SMTF Test Facility 750-MeV 45-kW e-beam on dump Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  10. Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  11. Cryomodule MARS15 Model Radiation loads to temperature sensors Duct streaming through waveguides in Linac Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  12. Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  13. Cryomodule Geometry in MARS15 Test calculation 100 MeV electron 1E12 e/sec (16W) 1mrad uniform loss inside cavity Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  14. Prompt Dose Rate Front View (Integrated over 12 m long) Side View (Integrated over diameter length) Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  15. Absorbed Dose Rates in Thermisters Up to 0.2 Gy/s, with 100-MeV 16-W beam loss Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  16. Needed Parameters • Source Term • Power? • Distributions of energy, angle, location? • for • - Beam halo • - Dark Current • Fowler-Nordheim Model • (TESLA Report 2003-10) •  Simplified source term? Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  17. Shielding and Maze Design for NIUILC Beam Diagnostics Laboratory • R&D on charged particle beam diagnostics for ILC (ILCTA at Fermilab, AWA at Argonne), FEL, proton driver • Ultimate goal: Operate a low-average-current, 6-20 MeV racetrack-microtron accelerator to drive coherent light source Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  18. Basic Beamline Design atBeam Diagnostic Laboratory <Beam Parameter> 6~20 MeV 10 A in peak 6uA in average Bunch 0.44 nC 10-20ps(total) 2.856 GHz Pulse 1 Hz Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  19. Shielding Structure at BDL ? Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  20. MARS15 Geometry Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

  21. Prompt Dose with MARS15 DOE regulation: Prompt Dose Rate < 1mrem/hr - Outside concrete shielding wall - Exit of Maze  Should Review dump & wall design Analytical approach + MARS15 Radiation Studies - N. Mokhov, N. Nakao, S. Striganov

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