Radsynch 2017 Taiwan, 19 21 April 2017 Shielding design study for - - PowerPoint PPT Presentation

▶
radsynch 2017
SMART_READER_LITE
LIVE PREVIEW

Radsynch 2017 Taiwan, 19 21 April 2017 Shielding design study for - - PowerPoint PPT Presentation

May 24, 2023 12 likes •364 views

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

slide-1
SLIDE 1

Shielding design study for the ESRF EBS project Paul Berkvens, Reine Versteegen, Patrick Colomp & Laurent Farvacque

Radsynch 2017

Taiwan, 19 – 21 April 2017

slide-2
SLIDE 2

SHIELDING DESIGN STUDY FOR THE ESRF EBS PROJECT

Page 2 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

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
slide-3
SLIDE 3

ESRF EBS PROJECT: EXTREMELY BRILLIANT SOURCE

Page 3 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

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 Horizontal Emittance [pm ·rad]

4000 150

Vertical Emittance [pm ·rad] 4 3 Beta at ID center, βx , βy [m] 37.6 , 3.0 (high β) 0.35 , 3.0 (low β) 3.6 , 3.6 Beam size at ID center, σx , σy [μm] 413 , 3.9 (high β) 50 , 3.9 (low β) 24 , 3.3 Beam div. at ID center, σx’ , σy’ [μrad] 10 , 1.3 (high β) 107, 1.3 (low β) 6.4 , 0.91

slide-4
SLIDE 4

ESRF EBS PROJECT: EXTREMELY BRILLIANT SOURCE

Page 4 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens 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 2016 2017 2018 2019 2020

now

slide-5
SLIDE 5

DECOMMISSIONING OF THE EXISTING STORAGE RING

Page 5 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

q

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

accelerator components

  • Detailed activation calculations of standard cell
  • Measurement protocols for different components
  • Provisional planning

Meeting with ASN, Paris in the coming weeks Reply from ASN expected mid 2017

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) 2019 2020 2021 2022 2023 2024

slide-6
SLIDE 6

SHIELDING DESIGN STUDY FOR THE ESRF EBS PROJECT

Page 6 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

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
slide-7
SLIDE 7

EBS PROJECT: RADIATION PROTECTION FRAMEWORK

Page 7 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

1st discussions with ASN:

  • Upgrade should not be considered as new facility but as a modification of an existing facility.
  • Authorisation request to be submitted to ASN September 2017
  • Radiation exposure should be as low as for present facility

 Aim ESRF: - Dose constraint: 1 mSv/y  800 µSv/y (2 µSv/4 h  1.6 µSv/4 h)

  • Commissioning period: maintain non-exposure status
  • Limit access to experimental hall to staff and long-term contractors
  • Guarantee monthly non-exposure limits

Compliance with Council Directive 2013/59/EURATOM

slide-8
SLIDE 8

EBS PROJECT: SHIELDING ASSESSMENT

Page 8 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

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

  • Verify that effective dose rates are << 0.4 µSv/h (1.6 µSv / 4h)

Minor incidents

  • Stored beam losses: estimate probability, assess dose
  • Injected beam losses
  • Assess integrated dose per 5 nC booster pulse (6 GeV, 5 mA, 1 µs)
  • Verify doses are kept under control via interlocked radiation monitors
  • Dose / booster pulse < 1.6 µSv
  • Validate number / location of interlocked dose monitors
slide-9
SLIDE 9

EBS PROJECT: SHIELDING ASSESSMENT

Page 9 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

Purpose: assessment of "normal exposure” and verify compliance with dose constraint. 2013/59/EURATOM : "normal exposure” means exposure expected to occur under the normal

  • perating 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:

  • 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 Multi-bunch 200 45 19.3 2.2 107 5.1 107 16 bunch 92 16 1.8 2.8 107 2.5 108 4 bunch 40 9 1.2 2.2 107 1.6 108

slide-10
SLIDE 10

EBS PROJECT: SHIELDING ASSESSMENT

Page 10 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

FLUKA model of EBS storage ring

FLUKA model of optics hutch

Shielding study: need for

  • 1. realistic geometry
  • 2. realistic beam losses
slide-11
SLIDE 11

ELECTRON BEAM LOSS DISTRIBUTION

Page 11 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

0.01 0.1 1 10 100

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

beam loss distribution along storage ring

beam loss per unit cell (% of total losses)

unit cell number

collimator location: between QF4E and SD1E

Matlab Accelerator Toolbox  Module developed for Touschek losses: 6 dimensional phase space distribution of lost electrons

slide-12
SLIDE 12

ELECTRON BEAM LOSS DISTRIBUTION: EXAMPLE UNIT CELL NUMBER 10

Page 12 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

  • 0.05

0.05

  • 0.03

0.03

  • 0.01

0.01

  • 0.015

0.015

y (m) y' (rad) x (m) x' (rad)

0.2 0.4 0.6 0.8 1

beam loss distribution within unit cell

cumulative beam losses within unit cell

for each unit cell: 6 dimensional phase space distribution of lost electrons

slide-13
SLIDE 13

SHIELDING DESIGN STUDY FOR THE ESRF EBS PROJECT

Page 13 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

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
slide-14
SLIDE 14

NORMAL BEAM LOSSES: 92 mA, 1.8 H LIFETIME – EX: CELLS 19, 20 AND 21

Page 14 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

µSv/h 0.4 µSv/h

beam height above roof

cm 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01

  • 2000
  • 1000

1000 2000 3000 4000 500

total effective dose rate (µSv/h) inner wall

  • uter wall

roof

slide-15
SLIDE 15

BEAM LOSS COLLIMATORS

Page 15 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

0.01 0.1 1 10 100

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

beam loss distribution along storage ring

beam loss per unit cell (% of total losses)

unit cell number

slide-16
SLIDE 16

5 4 3 2 1

  • 3000
  • 2000
  • 1000

1000 2000 3000 4000 5000

  • 3000
  • 2000
  • 1000

1000 2000 3000 4000 5000

COLLIMATOR: 92 mA, 1.8 H LIFETIME DECAY – 40 % LOCAL LOSS NO LOCAL SHIELDING

Page 16

µSv/h 0.1 µSv/h

total dose total effective dose rate (µSv/h)

cm

neutron

0.1

Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

1 0.1 0.01 0.001 1×10-4 1×10-5

inner wall total inner wall neutrons

  • uter wall total
  • uter wall neutrons

1 0.1 0.01 0.001 1×10-4 1×10-5

slide-17
SLIDE 17
  • 3000
  • 2000
  • 1000

1000 2000 3000 4000 5000 3000

  • 2000
  • 1000

1000 2000 3000 4000 5000

COLLIMATOR: 92 mA, 1.8 H LIFETIME DECAY – 40 % LOCAL LOSS LOCAL HEAVY CONCRETE SHIELDING

Page 17

µSv/h

total dose total effective dose rate (µSv/h)

cm

neutron

0.1

Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

1 0.1 0.01 0.001 1×10-4 1×10-5

inner wall total inner wall neutrons

  • uter wall total
  • uter wall neutrons

1 0.1 0.01 0.001 1×10-4 1×10-5

0.1 µSv/h

slide-18
SLIDE 18

COLLIMATOR: 92 mA, 1.8 H LIFETIME DECAY – 40 % LOCAL LOSS NO LOCAL SHIELDING VS. LOCAL HEAVY CONCRETE SHIELDING µSv/h 0.1

No shielding Local heavy concrete shielding

Page 18 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

slide-19
SLIDE 19

3000

  • 2000
  • 1000

1000 2000 3000 4000 5000 3000

  • 2000
  • 1000

1000 2000 3000 4000 5000

COLLIMATOR: 200 mA BEAM DUMP (RF TRIP) – 100 % LOCAL LOSS LOCAL HEAVY CONCRETE SHIELDING

Page 19

µSv

total dose total effective dose (µSv)

cm

neutron

Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

1 0.1 0.01 0.001 1×10-4 1×10-5

inner wall total inner wall neutrons

  • uter wall total
  • uter wall neutrons

1 0.1 0.01 0.001 1×10-4 1×10-5

slide-20
SLIDE 20

SHIELDING DESIGN STUDY FOR THE ESRF EBS PROJECT

Page 20 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

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
slide-21
SLIDE 21

1.E-07 1.E-06 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00

  • 3000
  • 2000
  • 1000

1000 2000 3000 4000 5000

INJECTED BEAM INCIDENTS: 5 nC INJECTED WITH DQ1B MAGNET OFF

Page 21 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

µSv

beam height above roof

Roof Inner wall Outer wall cm

total effective dose (µSv)

slide-22
SLIDE 22

1.E-06 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01

  • 3000
  • 2000
  • 1000

1000 2000 3000 4000 5000

INJECTED BEAM INCIDENTS: 5 nC INJECTED ON CLOSED GATE VALVE

Page 22 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

µSv

beam height above roof

Roof Inner wall Outer wall cm

total effective dose (µSv)

slide-23
SLIDE 23

1.E-04 1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02

  • 3000
  • 2000
  • 1000

1000 2000 3000 4000 5000

STORED BEAM INCIDENT: 200 mA LOST ON CLOSING GATE VALVE

Page 23 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

µSv

total dose neutrons

Inner wall total Inner wall neutrons Outer wall total Inner wall neutrons

1.6 µSv

cm

total effective dose (µSv)

beam

slide-24
SLIDE 24

SHIELDING DESIGN STUDY FOR THE ESRF EBS PROJECT

Page 24 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

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
slide-25
SLIDE 25

1.E-05 1.E-04 1.E-03 1.E-02

  • 2000
  • 1000

1000 2000 3000 4000 5000

STANDARD CELL ACTIVATION EQUILIBRIUM RESIDUAL DOSE RATES AFTER 20 y

Page 25

µSv/h

1 day decay time

Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

Residual effective dose rate at 1 m from beam axis (µSv/h)

cm

slide-26
SLIDE 26

1.E-06 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00

  • 2000
  • 1000

1000 2000 3000 4000

COLLIMATOR ACTIVATION EQUILIBRIUM RESIDUAL DOSE RATES (20 y) – 40 % LOCAL LOSS

Page 26

µSv/h

5 minutes decay time

Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

Residual effective dose rate at 1 m from beam axis (µSv/h)

slide-27
SLIDE 27

COLLIMATOR ACTIVATION EQUILIBRIUM RESIDUAL DOSE RATES (20 y) – 40 % LOCAL LOSS

Page 27

µSv/h

1 day decay time

Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

slide-28
SLIDE 28

COLLIMATOR ACTIVATION EQUILIBRIUM RESIDUAL DOSE RATES (20 y) – 40 % LOCAL LOSS

Page 28

µSv/h

Local shielding: 5 mm Pb under roof beams

Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

slide-29
SLIDE 29

COLLIMATOR ACTIVATION RESIDUAL DOSE RATES FOLLOWING 200 mA BEAM DUMP – 100 % LOCAL LOSS

Page 29

µSv/h

1 minute decay time

0.1

Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

1.E-06 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00 1.E+01

  • 2000
  • 1000

1000 2000 3000 4000

Residual effective dose rate at 1 m from beam axis (µSv/h)

slide-30
SLIDE 30

ACTIVATION: RESIDUAL DOSE RATES FOLLOWING 200 mA BEAM DUMP (100 % LOCAL LOSSES)

Page 30

µSv/h

1 day decay time

0.1

Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

Interlock areas around collimators No access before ~1 hour after beam dump  Requires major modification of PSS

slide-31
SLIDE 31

SHIELDING DESIGN STUDY FOR THE ESRF EBS PROJECT

Page 31 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

Contents

  • 1. Short introduction to the EBS project
  • 2. Shielding study and radiation protection policy
  • 3. Normal beam losses
  • 4. Abnormal stored beam and injection incidents
  • 5. Residual dose rates from activation
  • 6. RF ducts
slide-32
SLIDE 32

RF DUCTS

Page 32 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

25 cm × 25 cm square hole 119 cm Cells 5, 7 and 25 Single-cells HOM cavities

slide-33
SLIDE 33

1.E-04 1.E-03 1.E-02 1.E-01

  • 400
  • 200

200 400

RF DUCTS: 92 mA, 1.8 H LIFETIME DECAY

Page 33 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

total dose neutrons µSv/h

distance from beam axis (cm) effective dose rate (µSv/h) total dose neutron dose

slide-34
SLIDE 34

1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03

  • 200
  • 150
  • 100
  • 50

RF DUCTS: SYNCHROTRON RADIATION 200 mA STORED BEAM

Page 34 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens

µSv/h

distance from beam axis (cm) effective dose rate (µSv/h)

5 mm Pb

total dose neutron dose

no shielding 5 mm Pb

slide-35
SLIDE 35

MANY THANKS FOR YOUR ATTENTION

Page 35 Radsynch17, Taiwan 19 - 21 April 2017 - EBS project ESRF - Paul Berkvens