cern experience: vacuum design, interventions and
TRANSCRIPT
![Page 1: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/1.jpg)
Vacuum design, interventions and
operation in radioactive
environmentJose A. Ferreira on behalf of TE-VSC
CERN experience:
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL1
Contributions from Pawel Krakowski, Robin Nelen, Jaime Perez Espinos and Lukasz Piotr Krzempek
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Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL2
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
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Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL3
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
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Design: Material Validation
Why?
Consequences of equipment
radiation damage :
• Machine unavailability
• Unforeseen replacement
costs
Equipment qualification allows :
• Meeting equipment lifetime
and specs
• Anticipate failures
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL4
Vacuum bake out jacket irradiation with
gamma up to 10 MGy is heavily damaged
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Design: Material ValidationCERN has a tested and extensive compilation of radiation test data: “Yellow books”
Late 70’s - early 2000’s :
Yellow books: Compilation of radiation damage test data
Current situation
Increasing demand for high dose irradiation tests
Equipment owner fully responsible for their equipment
R2E and R2M
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL5
Yellow book report CERN-98-01
Compilation of radiation damage test data
http://cds.cern.ch/record/357576
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Design: Material Validation
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL6
Preparation
Material(s):
Representative radiation (Gamma, Particles)
Installation area(s) and
expected lifetime:Total dose /
fluency
Pre- and Post-Irradiation
characterization test(s):
Samples size / shape / number
RequirementsChoice of an
irradiation facility
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The sub-WP1 (R2E):
• Task 1: Active gauges in the arcs;
• Task 1.2: Active piezo gauges in the arcs & dump lines;
• Task 2: Active gauges in the LSS;
• Task 3: 24 VDC local power supply for fixed pumping groups.
• Radiation Hardness Guideline for VSC electronics developments for 500 Gy
Design: Material Validation
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL7
LOG#1LOG#2 4-20 mA
Vac sim 11TΩ
The sub-WP2 (R2M):
• Task 1: O-ring seals;
• Task 1.2: F6 and F14 O-ring seals under compression; (Awaiting
for irradiation)
• Task 2: Permanent bake-out components;
• Task 2.2: New bake-out jackets for LHC bellows close to
collimators;
(Awaiting for irradiation)
• Task 3: NiTiNb SMA (Shape Memory Alloy) connectors;
• Task 3.2: SMA (Shape Memory Alloy) connectors set-up in
TDC2;
• Task 3.3: 4 SMA set-ups in TDC2 with pumping and online
monitoring (Just approved!)
• Task 4: Primary and turbo pumps;
• Task 5: Micro switches and distributors for sector valves;
• Task 6: Passive penning gauge and its HV cable under high
HEH;
• Task 6.2: Induced current in HV cables under radiation;
• Task 6.3: Radiation induced cables aging impact on their
electrical performance
(all samples irradiated, awaiting for post studies);
• Task 7: Silicon rubbers and polyurethanes clamps, vacseal &
epoxies;
• Task 8: Piezoelectric venting valve;
• Task 9: Passive piezo resistive gauge in the LSS & dump lines.
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Design: Material Validation
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL8
Immediate pressure change when
beam ONImmediate pressure change when
beam ON or OFF
When no beam pressure values
come back to previous states !
No memory effect…
BEAM OFF
BEAM ONBEAM ON
BEAM OFF BEAM OFF
BEAM ON
4E-10 mbar
6E-11 mbar
~E-12 mbar
RUN_2 and 3 have confirmed that the TFA3 Triaxial cable is the source of “spikes”
RUN_2 and 3 only 3 penning gauges and 1 simulator
Gaugea2
disconnected
and replaced by
passive simulator
(11 TΩ)
RUN_1 only penning gauges
4 passive penning
connected to small
vacuum chambers
pumped down in
ranges from 10-10
up to 10-12 mbar
The same behaviour
was observed with
gauge and passive
vacuum simulator !
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Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL9
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
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Design: Reduce exposure
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL10
1970 quick connect clamp
developed for PSB:
Low cost seal
Quick installation and
removal
Low activation (aluminium)
Extreme reliability for UHV
Space allowed along beam
axis for joint including
clearance <40 mm
Small radial space occupied
by the quick connect
Option to be electrically
insulated
Mild bake-out 130°C
PS195 clamp (quick connect up to 150 mm)
Low Cost Vacuum Hardware Developed for the CERN PS Booster
C.E. Rufer and W. Unterlerchner
IEEE Transactions on Nuclear Science Vol 18-3, June 1971
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Design: Reduce exposure
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL
11
PS195 clamp was extremely successful Other designs followed during 70’s
PS250 (up to 200 mm tube)
SPS collars:
Tube up to 70, 159, 219,
273 mm
Bakeable up to 150°C for
D70 and DN159, 80°C for
bigger sizes
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Design: Reduce exposureShape Memory Alloys
No seal
Open/close by heating/cooling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL12
Proof of concept of SMA connectors for
Ultra High Vacuum (UHV) chambers.
T<As (40 °C) T>Af (>100 °C)
pmax
SMA ring
Tube
1. Mounting at room temperature
2. Tightening by heating above 100 °C
3. Leak Rate < 10-10 mbar·l·s-1 at room temperature
4. Dismounting by cooling down to -40°C
Mounting Clamping
T = RT
pop
Operation
T<Mf (-40 °C)
Dismounting
As: Austenite start temperature Af: Austenite finish temperature Ms: Martensite start temperature Mf: Martensite finish temperature
Material properties:
NiTi based alloys
Magnetic permeability < 1.002
Thermal outgassing: < 10-13 mbar∙l∙s-1∙cm-2
Radiation hard ?? (tests ongoing)
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Design: Reduce exposureShape Memory Alloys
No seal
Open/close by heating/cooling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL13
Proof of concept of SMA connectors for
Ultra High Vacuum (UHV) chambers.
T<As (40 °C) T>Af (>100 °C)
pmax
SMA ring
Tube
1. Mounting at room temperature
2. Tightening by heating above 100 °C
3. Leak Rate < 10-10 mbar·l·s-1 at room temperature
4. Dismounting by cooling down to -40°C
Mounting Clamping
T = RT
pop
Operation
T<Mf (-40 °C)
Dismounting
As: Austenite start temperature Af: Austenite finish temperature Ms: Martensite start temperature Mf: Martensite finish temperature
Material properties:
NiTi based alloys
Magnetic permeability < 1.002
Thermal outgassing: < 10-13 mbar∙l∙s-1∙cm-2
Radiation hard ?? (tests ongoing)
A compact, leak tight and easily mountable/dismountable connection system
Possibility of remote controlling
Possibility to use in high demanding areas (e.g. collimator areas,
machine/detector interface)
Possibility to use in limited access spaces
Possibility to connect dissimilar materials
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Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL14
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
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Design: Tooling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL15
1979 SPS clamp for remote handling: Two sizes DN159
and DN350 in double and single configuration
NAHIF plugin magnet
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Design: Tooling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL16
https://cds.cern.ch/record/1054083
https://cds.cern.ch/record/1046075
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Design: Tooling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL17
https://cds.cern.ch/record/1054083
https://cds.cern.ch/record/1046075
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Design: Tooling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL18
Combination of automatic clamps and bellows
compression tools operated by robot. VAX ATLAS for HL-
LHC
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Design: Tooling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL19
Combination of automatic clamps and bellows
compression tools operated by robot. VAX ATLAS for HL-
LHC
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Design: Tooling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL20
Compression tool for replacement of LHC collimators
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Design: Tooling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL21
Compression tool for replacement of LHC collimators
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Design: Tooling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL22
The replacement of the seal is one of the most difficult steps
Male + Female flange and
seal adapted to robot
Last developments require the
use of remote controlled robots
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Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL23
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
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Design: Remote handling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL24
70’s and 80’ MANTIS and MANTIS2
Two extremely versatile tele-manipulators
Force reflecting servo Master-Slave
manipulators. Force feedback
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Design: Remote handling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL25
MANTIS:Able to
perform very
complex
actions
Very fast
learning curve
Difficult to
deploy
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Design: Remote handling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL26
MANTIS:Able to
perform very
complex
actions
Very fast
learning curve
Difficult to
deploy
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Design: Remote handling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL27
MANTIS:Able to
perform very
complex
actions
Very fast
learning curve
Difficult to
deploy
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Design: Remote handling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL28
3 robots in RIBs facilities (ISOLDE &
MEDICIS) to move irradiated targets
tEODor ,Telemax (bomb disposal
robots) and new multipurpose platform
with different arms under development
Robots currently used at CERN
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Design: Remote handling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL29
Impact wrench
Telemax
Robot capabilities can be extended
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Design: Remote handling
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL30
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Design: Remote handling
11/27/2017 Document reference 31
Leak detection with remote
operated robots
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Design: Remote handling
Robots vs Human
Cost
Difficult operation (trained personnel)
Time consuming
No dose
Example: remove 1 clamp at 5 mSv/h
Torque wrench: 3 minutes (250 μSv)
Cordless impact wrench: <20 seconds (<30 μSv)
Robot: 15-30 minutes (0 μSv)
11/27/2017 Document reference 32
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Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL33
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
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Interventions in radiation areas
11/27/2017 34
Lessons learned
ActionTooling
and training
Define steps
Gather information
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Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL35
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
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Sources of information
1. Drawings and pictures (2D, 3D)
2. Immersive 3D
1. High-Definition Surveying (Laser
scans)
2. 360º cameras
3. Robot inspections
Interventions: Preparation
11/27/2017 36
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11/27/2017 37
Preparation: Drawings
2D
Portable (paper)
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11/27/2017 38
Preparation: Drawings
Easy manipulation of
virtual world
3D
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Preparation: Pictures
11/27/2017 39
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Preparation: Immersive 3D (High
Definition Survey)
11/27/2017 40
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Preparation: Immersive 3D (High
Definition Survey)
11/27/2017 41
Real 3D model
Exportable to CAD
Measure
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Preparation: Immersive 3D (360º
video)
11/27/2017 42
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Preparation: Immersive 3D (360º
video)
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL43
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Preparation: Robot Inspections
11/27/2017 Document reference 44
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Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL45
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
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Interventions: Dose planning
11/27/2017 46
Define steps
Gather information
Allows to determine the level of the intervention
Define the number of participants
Evaluate the need of compensatory
measurements (longer cooldown, tooling, etc.)
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Work and dose planning (WDP)
Working timeEffective
avg. dose rateCollective dose Collective dose
Working time
real
Collective
real dose
Collective
real dose
[man.hours] [µSv/h] [man.µSv] [man.µSv] [man.hours] [man.µSv] [man.µSv]
Totals: 60,8 236 14334 14334 0 0 0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
No. Work description (Task) Responsible personDep/Grp
(executing)WorkTeam
Location
(check table 'DoseRates')Persons [No.]
Exposure time
[min]
Dose rate
[µSv/h]
Estimated dose
[µSv]
Estimated total
dose
[µSv]
Real time
[min]Real dose [µSv]
Real
total dose
[µSv]
Remarks
1 Vacuum sector 143 3780 0
1,00 Install VVSB 11960 Jose A. Ferreira TE/VSC/IVM 11960 3 45 41 92
1,01 Install pumps MKPA 11931 Jose A. Ferreira TE/VSC/IVM 11931 4 120 80 640
1,02 Install pumps MKPA 11936 Jose A. Ferreira TE/VSC/IVM 11936 4 120 80 640 0
1,03 Install pumps MKPC 11952 Jose A. Ferreira TE/VSC/IVM 11952 4 40 60 160
1,04 Install pumps MKP 11955 Jose A. Ferreira TE/VSC/IVM 11955 4 60 42 168
1,05 Connect 4xbellows Jose A. Ferreira TE/VSC/IVM 11931-11955 2 40 57 76
1,06 Install VVSB 11903 Jose A. Ferreira TE/VSC/IVM 11903 2 45 800 1200
1,07 Connect VVSB 11903 to MDVA 11904 (NEWmagnet) and BPCE 11906 (new monitor) Jose A. Ferreira TE/VSC/IVM 11904 2 15 800 400
1,08 Connect QDA 11910 Jose A. Ferreira TE/VSC/IVM 11910 2 10 1000 333
1,09 Pump down Jose A. Ferreira TE/VSC/IVM 11903-11960 2 15 140 70
1,10 Leak detection 11903-11960 0 ???? 140 robot (time)
1,10 Leak detection Jose A. Ferreira TE/VSC/IVM 11903-11960 0 ???? 10 robot (time)
2 Vacuum sector 150 361 0
2,01 Connect vacuum 8 xchambers Jose A. Ferreira TE/VSC/IVM 11971-11990 2 40 50 67 Without TBSJ
2,02 Install pump 11993 Jose A. Ferreira TE/VSC/IVM 11993 2 15 120 60 0 To be done in BA5 or A6 -
2,03 Connect TBSJ (entrée 1m) 2 5 200 33
2,04 Connect TBSJ (sortie - de 40cm) Jose A. Ferreira TE/VSC/IVM 11995 2 5 150 25 0
2,05 Pump down Jose A. Ferreira TE/VSC/IVM 11971-11995 2 15 176 88
2,06 Leak detection 11971-11995 1 15 176 44 Perche pour sprayer
2,07 Leak detection Jose A. Ferreira TE/VSC/IVM 11971-11995 1 15 176 44
3 Vacuum sectors 131-132-133 49 0
3,01 Remove old group and install new chamber Jose A. Ferreira TE/VSC/IVM 11653 2 45 8 12
3,01 Connect MKQH 11653 Jose A. Ferreira TE/VSC/IVM 11653 2 20 8 5 0
3,01 Connect 2xpumps Jose A. Ferreira TE/VSC/IVM 11653 2 30 8 8 0
3,01 Pump down Jose A. Ferreira TE/VSC/IVM 11653 2 15 8 4 0
3,01 Leak detection Jose A. Ferreira TE/VSC/IVM 11653 2 10 8 3 0
3,01
3,01 Vacuum sector 132 0
3,01 Pump down Jose A. Ferreira TE/VSC/IVM 11672 2 15 6 3 0
3,01 Leak detection Jose A. Ferreira TE/VSC/IVM 11672 2 10 6 2 0
3,01
3,01 Vacuum sector 133 0
3,01 Remove old group and install new chamber Jose A. Ferreira TE/VSC/IVM 11679 2 45 3 4,5 0
3,01 Connect MKQV 11679 Jose A. Ferreira TE/VSC/IVM 11679 2 20 3 2 0
3,01 Connect 2xpumps Jose A. Ferreira TE/VSC/IVM 11679 2 30 3 3 0
3,01 Pump down Jose A. Ferreira TE/VSC/IVM 11679 2 15 3 1,5 0
3,01 Leak detection Jose A. Ferreira TE/VSC/IVM 11679 2 10 3 1 0
6 Vacuum sector 142 (TT10) 660 0
6,01 Connect chambers and equipment from 102871 to 103000 Jose A. Ferreira TE/VSC/IVM 102871-103000 2 120 165 660 0
0
7 Vacuum sector 135 24 0
7,01 Install valve VVSB 11740 Jose A. Ferreira TE/VSC/IVM 11740 2 30 5 5 0
Reinstallation vacuum equipments LSS1
Work and dose planning - LSS1 reinstallation: vacuum
Prior intervention
To be completed and checked by work coordinator(s) and experts
Prior intervention
To be checked and completed by RP
Posterior intervention
To be completed by work coordinator or/and RP
11/27/2017 Document reference 47
Detailed step by step description
of the different tasks
Number of participants
Depending on the dose levels
justification/optimization could
be required
![Page 48: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/48.jpg)
Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL48
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
![Page 49: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/49.jpg)
Tooling and Training
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL49
Window replacement in North Area
next to target T6
Mockups help to train participants no necessarily
familiarized with the activity
Mockups help to check assumptions done to prepare
WDP
Use the information collected to prepare the WDP
during the debriefing
![Page 50: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/50.jpg)
Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL50
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
![Page 51: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/51.jpg)
Execution
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL51
Any discussion in the field must be
avoided!
Follow up the intervention with cameras
if available
Picture taken from overhead crane
![Page 52: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/52.jpg)
Execution
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL52
During leak detection: Was everything tested? Repeat?
Cameras help to avoid repeating the work
![Page 53: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/53.jpg)
Execution
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL53
During leak detection: Was everything tested? Repeat?
Cameras help to avoid repeating the work
![Page 54: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/54.jpg)
Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL54
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
![Page 55: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/55.jpg)
RIBs
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL55
![Page 56: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/56.jpg)
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL56
![Page 57: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/57.jpg)
RIBs: Operation
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL57
The On-Line Isotope Mass Separator
ISOLDE production of radioactive ion
beams (RIBs)
FrontEnd area, highly activated,
contaminated and corrosion (air ionization)
Pumping with turbomolecular pumps (no
maintenance) and oil rotary vane pumps
Radioactive isotopes from the target:
Stick to the surface (vacuum chambers
and turbopumps)
Volatile pumped out by the vacuum
system
Rotary vane pumps retain part of the
contamination Highly contaminated
![Page 58: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/58.jpg)
RIBs: Operation
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL58
Oil replacement
Reduce risk of contamination:
Fast connection and portable pump to extract the oil
![Page 59: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/59.jpg)
RIBs: OperationExhaust system has two pressure levels:
Buffer volume (receives gas from primary pumps). Always below atmospheric.
Storage tanks (receive gas from buffer). From vacuum to 2500 mbar
Operational pressure of buffer volume has a huge impact on gas loads
Original operation From 400 to 700 mbar
Operation from 625 to 825 mbar > factor of 5 reduction of gas load
Gas loads dominated by He injection from ISCOOL (RFQ) when operating
![Page 60: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/60.jpg)
Outline
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL60
• Material validation
• Reduce exposure
• Tooling
• Remote handling
Vacuum design of radioactive areas
• Preparation
• Dose planning
• Tooling and training
• Execution
Interventions in radioactive areas
• RIBs operation: ISOLDE
• New RIBs facility: MEDICIS
Operation of radioactively contaminated areas
![Page 61: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/61.jpg)
RIBs: New facility
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL61
![Page 62: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/62.jpg)
RIBs: New facility
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL62
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RIBs: New facility
Only 10% of the beam taken
by ISOLDE target Irradiation
of MEDICIS target
Off-line irradiation and transfer
tor isotope collection
High levels of radioactive
contamination inside vacuum
system are expected
Gas storage system for
radioactive decay before
release
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL63
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RIBs: New facility
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL64
Sector 2: MSEP10Sector 1: MFE10
MCOL110.VVS.01
MFE10.VVS.01
MFE10.VVH.01 MFE10.VVR.01
MFE10.VVV01
MSEP10.VVH.01
MSEP10.VVR.01
MSEP10.VVV.01
MSEP11.VPT.01
MFE11.VPT.01 MSEP11.VVB.01
MSEP11.VVD.01
MFE11.VVB.01
MFE11.VVD.01
MR10.VVI.02
MB10.VVI.01
MR10.VPV.01 MB10.VPV.01
Exhaust
VGPVGR
VGP VGR
VGR
VGR VGR
VGR
Venting Ar
VGM
Chamber 1: MCOL110Chamber 2:MCOL210
MCOL210.VVV.01
VGP
VGR
VGR
MFE11.VGR.01
MFE10.VGP.01
MFE10.VGR.01
MFE10.VGM.01
MSEP10.VGP.01MSEP10.VGR.01
MSEP11.VGR.01
MR10.VGR.01
MRAB10.VGR.01
MCOL110.VGP.01
MCOL110.VGR.01
MCOL210.VVM.01
MCOL210.VGR.01
MAR10.VGM.01
MCOL110.VVH.01
MCOL110.VVR.01
MCOL110.VVV.01
MCOL210.VVR.01
MCOL210.VVH.01
VGP
MSEP11.VGP.01
MRAB10.VVY.01
MB10.VGR.01
MAR10.VVV.01
Ar line
![Page 65: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/65.jpg)
RIBs: New facility
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL65
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RIBs: New facility
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL66
From machine
MEXH10.VPV.01
VGM
Tank 1 (1000L)
Tank 2 (1000L)
MEXH20.VVI.01
MEXH20.VVI.02
MEXH30.VVI.01
MEXH30.VVI.02
MEXH30VPD.01
MEXH30.VVI.03
VGM
VGM
MEXH10.VGM.01
P
MEXH20.VSA.01
MEXH20.VGM.01
MEXH20.VGM.02
P
MEXH30.VSA.01
Buffer volume (100 L)
MEXH01.VVI.02
MEXH01.VVI.01
Buffer volume (100 L)
MEXH02.VVI.02
MEXH02.VVI.01
Buffer volume (100 L)
MEXH03.VVI.02
MEXH03.VVI.01
P
MEXH00.VSA.01
VGR
VGR
P
MEXH10.VSA.01
MEXH10.VGR.01
MEXH00.VGR.01
VGR
MEXH01.VGR.01
VGR VGR
MEXH02.VGR.01 MEXH03.VGR.01
VGR
MEXH20.VGR.01
VGRMEXH20.VGR.02
P
MEXH00.VSA.02
Gas recovery system:
Two buffer volumes inside bunker with adjusted minimum
decay of 7 days
One bypass volume to pump from atmospheric pressure
Buffer volume (600-800)
Two storage tanks to accumulate gas (150-2000 mbar)
![Page 67: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/67.jpg)
Summary
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL67
Material validation is extremely important to reduce the failure rate and
define lifetime of vacuum components exposed to radiation damage
Important for future collective dose
Evaluate dosing interventions during design phase design to
consider human or/and possible remote intervention
Remote handling can have a strong impact on collective dose (but not
for free, time consuming and expensive)
Preparation and follow up of interventions in radioactive areas
(training, tooling, etc.) can have a big impact reducing collective dose
The vacuum operation RIBs facilities require specific exhaust storage
system to reduce the activity released to the environment
![Page 68: CERN experience: Vacuum design, interventions and](https://reader031.vdocuments.us/reader031/viewer/2022012022/6169bc9411a7b741a34acb21/html5/thumbnails/68.jpg)
Vide en milieux ionisants, 22-24
noviembre 2017, GANIL68