Radsynch 2017 Taiwan, 19 – 21 April 2017 Shielding design study for the ESRF EBS project Paul Berkvens, Reine Versteegen, Patrick Colomp & Laurent Farvacque
SHIELDING DESIGN STUDY FOR THE ESRF EBS PROJECT Contents 1. Short introduction to the EBS project 2. Shielding study and radiation protection policy 3. Normal beam losses 4. Abnormal stored beam losses and injection incidents 5. Residual dose rates from activation 6. RF ducts Page 2 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
ESRF EBS PROJECT: EXTREMELY BRILLIANT SOURCE Parameter Existing Lattice New Lattice Energy, E [GeV] 6.04 6.04 Circumference, C [m] 844 844 RF frequency, fRF [MHz] 352 352 Beam current [mA] 200 200 4000 150 Horizontal Emittance [pm ·rad] Vertical Emittance [pm ·rad] 4 3 37.6 , 3.0 (high β) Beta at ID center, β x , β y [m] 3.6 , 3.6 0.35 , 3.0 (low β) 413 , 3.9 (high β) Beam size at ID center, σ x , σ y [μm] 24 , 3.3 50 , 3.9 (low β) 10 , 1.3 (high β) 6.4 , 0.91 Beam div. at ID center, σ x’ , σ y’ [ μrad ] 107, 1.3 (low β) Page 3 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
ESRF EBS PROJECT: EXTREMELY BRILLIANT SOURCE 2016 2017 2018 2019 2020 J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D User Service Mode Design and Procurement Production Assembly Dismantling Installation Accelerator commissioning Beamline commissioning Friendly users now Page 4 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
DECOMMISSIONING OF THE EXISTING STORAGE RING Decommissioning of the existing storage ring has to be done within the French legal framework: absence of clearance levels . Revised technical study sent to ASN, March 2016 Proposed criteria for radiological classification of o accelerator components Detailed activation calculations of standard cell o Measurement protocols for different components o Provisional planning o q Meeting with ASN, Paris in the coming weeks Reply from ASN expected mid 2017 2019 2020 2021 2022 2023 2024 J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D cable trays, cables, piping (322 d) supports quadrupoles (440 d) sextupoles (280 d) dipoles (64 d) vacuum vessels (140 d) Page 5 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
SHIELDING DESIGN STUDY FOR THE ESRF EBS PROJECT Contents 1. Short introduction to the EBS project 2. Shielding study and radiation protection policy 3. Normal beam losses 4. Abnormal stored beam losses and injection incidents 5. Residual dose rates from activation 6. RF ducts Page 6 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
EBS PROJECT: RADIATION PROTECTION FRAMEWORK 1 st discussions with ASN: o Upgrade should not be considered as new facility but as a modification of an existing facility. o Authorisation request to be submitted to ASN September 2017 o Radiation exposure should be as low as for present facility Aim ESRF: - Dose constraint: 1 mSv/y 800 µ Sv/y (2 µ Sv/4 h 1.6 µ Sv/4 h) - Commissioning period: maintain non-exposure status o Limit access to experimental hall to staff and long-term contractors o Guarantee monthly non-exposure limits Compliance with Council Directive 2013/59/EURATOM Page 7 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
EBS PROJECT: SHIELDING ASSESSMENT 2013/59/EURATOM : "normal exposure” means exposure expected to occur under the normal operating conditions of a facility or activity (including maintenance, inspection, decommissioning), including minor incidents that can be kept under control, i.e. during normal operation and anticipated operational occurrences. Normal losses o Verify that effective dose rates are << 0.4 µ Sv/h (1.6 µ Sv / 4h) Minor incidents o Stored beam losses: estimate probability, assess dose o Injected beam losses o Assess integrated dose per 5 nC booster pulse (6 GeV, 5 mA, 1 µ s) o Verify doses are kept under control via interlocked radiation monitors Dose / booster pulse < 1.6 µ Sv • • Validate number / location of interlocked dose monitors Page 8 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
EBS PROJECT: SHIELDING ASSESSMENT Purpose: assessment of "normal exposure” and verify compliance with dose constraint. 2013/59/EURATOM : "normal exposure” means exposure expected to occur under the normal operating conditions of a facility or activity (including maintenance, inspection, decommissioning), including minor incidents that can be kept under control, i.e. during normal operation and anticipated operational occurrences. Major challenge: o maximum beam losses × 10 use existing bulk shielding install (2) beam loss collimators + local shielding Lifetime (h) Beam losses (e/s) Beam mode Stored current (mA) Present lattice EBS lattice Present lattice EBS lattice 2.2 10 7 5.1 10 7 Multi-bunch 200 45 19.3 2.8 10 7 2.5 10 8 16 bunch 92 16 1.8 2.2 10 7 1.6 10 8 4 bunch 40 9 1.2 Page 9 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
EBS PROJECT: SHIELDING ASSESSMENT Shielding study: need for 1. realistic geometry 2. realistic beam losses FLUKA model of EBS storage ring FLUKA model of optics hutch Page 10 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
ELECTRON BEAM LOSS DISTRIBUTION beam loss per unit cell (% of total losses) 100 Matlab Accelerator Toolbox Module developed for Touschek losses: 10 6 dimensional phase space distribution of lost electrons 1 0.1 0.01 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 unit cell number beam loss distribution along storage ring collimator location: between QF4E and SD1E Page 11 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
ELECTRON BEAM LOSS DISTRIBUTION: EXAMPLE UNIT CELL NUMBER 10 0.05 for each unit cell: 6 dimensional phase space distribution of lost electrons x' (rad) 0 1 cumulative beam losses within unit cell 0.8 0.6 -0.05 x (m) 0.4 -0.03 0 0.03 0.01 0.2 0 y' (rad) 0 -0.01 y (m) beam loss distribution within unit cell -0.015 0 0.015 Page 12 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
SHIELDING DESIGN STUDY FOR THE ESRF EBS PROJECT Contents 1. Short introduction to the EBS project 2. Shielding study and radiation protection policy 3. Normal beam losses 4. Abnormal stored beam losses and injection incidents 5. Residual dose rates from activation 6. RF ducts Page 13 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
NORMAL BEAM LOSSES: 92 mA, 1.8 H LIFETIME – EX: CELLS 19, 20 AND 21 1.E-01 total effective dose rate ( µ Sv/h) 0.4 µ Sv/h inner wall outer wall 1.E-02 roof 1.E-03 µ Sv/h 1.E-04 1.E-05 cm -2000 -1000 0 1000 2000 3000 4000 500 beam height above roof Page 14 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
BEAM LOSS COLLIMATORS beam loss per unit cell (% of total losses) 100 10 1 0.1 0.01 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 unit cell number beam loss distribution along storage ring Page 15 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
COLLIMATOR: 92 mA, 1.8 H LIFETIME DECAY – 40 % LOCAL LOSS NO LOCAL SHIELDING total effective dose rate ( µ Sv/h) 1 1 0 0 0.1 µ Sv/h outer wall total inner wall total 0.1 0.1 1 inner wall neutrons outer wall neutrons µ Sv/h 0.01 0.01 2 0.001 0.001 3 1×10 -4 1×10 -4 4 1×10 -5 1×10 -5 5 -3000 -2000 -1000 0 1000 2000 3000 4000 5000 -3000 -2000 -1000 0 1000 2000 3000 4000 5000 0.1 cm total dose neutron Page 16 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
COLLIMATOR: 92 mA, 1.8 H LIFETIME DECAY – 40 % LOCAL LOSS LOCAL HEAVY CONCRETE SHIELDING total effective dose rate ( µ Sv/h) 1 1 0 0.1 µ Sv/h outer wall total inner wall total 0.1 0.1 inner wall neutrons outer wall neutrons µ Sv/h 0.01 0.01 0.001 0.001 1×10 -4 1×10 -4 1×10 -5 1×10 -5 3000 -2000 -1000 0 1000 2000 3000 4000 5000 -3000 -2000 -1000 0 1000 2000 3000 4000 5000 0.1 cm total dose neutron Page 17 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
COLLIMATOR: 92 mA, 1.8 H LIFETIME DECAY – 40 % LOCAL LOSS NO LOCAL SHIELDING VS. LOCAL HEAVY CONCRETE SHIELDING No shielding µ Sv/h 0.1 Local heavy concrete shielding Page 18 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
COLLIMATOR: 200 mA BEAM DUMP (RF TRIP) – 100 % LOCAL LOSS LOCAL HEAVY CONCRETE SHIELDING 1 1 0 total effective dose ( µ Sv) outer wall total inner wall total 0.1 0.1 inner wall neutrons outer wall neutrons µ Sv 0.01 0.01 0.001 0.001 1×10 -4 1×10 -4 1×10 -5 1×10 -5 3000 -2000 -1000 0 1000 2000 3000 4000 5000 3000 -2000 -1000 0 1000 2000 3000 4000 5000 cm total dose neutron Page 19 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens
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