Safety issues for WP2 E. Baussan on behalf of WP2

Safety issues for WP2Safety issues for WP2E. Baussan on behalf of WP2E. Baussan on behalf of WP2

10/06/2011 1st Euronu Safety Workshop Safety Issues for WP2

2

Safety Issues for WP2

Outlines:Outlines:

– Physics with a neutrino superbeamPhysics with a neutrino superbeam

– Technological ChallengeTechnological Challenge– Status on WP2Status on WP2– SafetySafety

• ALARA ApproachALARA Approach• SimulationSimulation


3

Neutrino Beam Experiments


4

HP-SPL for neutrino beams


5

Super Beam Neutrino Experiment Layout


6



7


Memphys Detector:

• Underground water Cherenkov detector at Underground water Cherenkov detector at Laboratoire Laboratoire Souterrain de ModaneSouterrain de Modane Fréjus at 4800 m.w.e. Fréjus at 4800 m.w.e.

• Total fiducial volume: up to 400 kton: 3 x 65mX60 Total fiducial volume: up to 400 kton: 3 x 65mX60 modules could be designed up to 572kton: 3x 65mX80mmodules could be designed up to 572kton: 3x 65mX80m

• PMT R&D + detailed study on excavation existing & PMT R&D + detailed study on excavation existing & ongoing + prototype Cherenkov detector MEMPHYNOongoing + prototype Cherenkov detector MEMPHYNO

• Underground water Cherenkov detector at Underground water Cherenkov detector at Laboratoire Laboratoire Souterrain de ModaneSouterrain de Modane Fréjus at 4800 m.w.e. Fréjus at 4800 m.w.e.

• Total fiducial volume: up to 400 kton: 3 x 65mX60 Total fiducial volume: up to 400 kton: 3 x 65mX60 modules could be designed up to 572kton: 3x 65mX80mmodules could be designed up to 572kton: 3x 65mX80m

• PMT R&D + detailed study on excavation existing & PMT R&D + detailed study on excavation existing & ongoing + prototype Cherenkov detector MEMPHYNOongoing + prototype Cherenkov detector MEMPHYNO


8

Technological challenge


9

Target Technology


10

Target Technology


11

Horn : Previous Studies

• Beam and Target Parameter:


12

Horn: status for WP2


13



14

Horn: Dynamic Stress Analyses due to Thermal and Magnetic pulsesHorn: Dynamic Stress Analyses due to Thermal and Magnetic pulses

Dynamic stresses are due to Transient Joule heating due to the

current passing through the horn’s skin

Secondary Particles Magnetic Pulses/forces

Pulse: 100μsT=1/50/4s=0.08s

von Mises stresses due to thermal loads

magnetic pressure on the horn

stress vs time in the horn, 25pulses

static stress

deformation


15

Horn: Static stress, deformation

dynamic stress superimposed on the quasi-static stress are the basis of the fatigue life time estimate of the horn – work ongoing

in order to assess the horn deformation and horn life time, the calculation of the stress inside the horn is necessary. The stress level in the structure should be low enough in comparison with the fatigue limit of the materials. Loads coming from the magnetic pressure and the thermal dilatation of the material

9.9mm 10.5mm

displacement due to magnetic pressure

displacement due to magnetic pressure and thermal dilatation

Horn without integrated target

horn with integrated target: highly stress domain exists on the inner conductor and in the right angles connection domains + high energy deposition on the inner conductor

Horn with separated target and rounded back-plate, corners


16


Target Station Baseline :Target Station Baseline :• Solid Static targetSolid Static target• Use multiple 4 targets+ hornsUse multiple 4 targets+ horns• Beam frequency 12.5 HzBeam frequency 12.5 Hz• Cooling (EUROnu WP2 Note 10-06)Cooling (EUROnu WP2 Note 10-06)• Power distribution due to Joule losses & Power distribution due to Joule losses &

secondary particlessecondary particles• Energy balance, to maintain working Energy balance, to maintain working

temperaturetemperature• Flow rateFlow rate• Jet distribution along the outer Jet distribution along the outer

conductorconductor• h correlation for jets’ geometryh correlation for jets’ geometry

Target Station Baseline :Target Station Baseline :• Solid Static targetSolid Static target• Use multiple 4 targets+ hornsUse multiple 4 targets+ horns• Beam frequency 12.5 HzBeam frequency 12.5 Hz• Cooling (EUROnu WP2 Note 10-06)Cooling (EUROnu WP2 Note 10-06)• Power distribution due to Joule losses & Power distribution due to Joule losses &

secondary particlessecondary particles• Energy balance, to maintain working Energy balance, to maintain working

temperaturetemperature• Flow rateFlow rate• Jet distribution along the outer Jet distribution along the outer

conductorconductor• h correlation for jets’ geometryh correlation for jets’ geometry


17

Feed back from other neutrino beam experiments

Striplines plate with soft transition

• Recommandations from others Recommandations from others facilities:facilities:– Cracks in weldsCracks in welds– Use flexible pipes to reduce stress and Use flexible pipes to reduce stress and

fatiguefatigue– Water leaks due to galvanic corrosion Water leaks due to galvanic corrosion

=> avoid trapped water and choose => avoid trapped water and choose material carefullymaterial carefully

– Use semi flexible conductor because Use semi flexible conductor because of important magnetic force between of important magnetic force between stripline => can break cablestripline => can break cable

– Heat dissipation of the striplineHeat dissipation of the stripline– Remote design for repairing/exchangeRemote design for repairing/exchange– Need SparesNeed Spares– ……

• Recommandations from others Recommandations from others facilities:facilities:– Cracks in weldsCracks in welds– Use flexible pipes to reduce stress and Use flexible pipes to reduce stress and

fatiguefatigue– Water leaks due to galvanic corrosion Water leaks due to galvanic corrosion

=> avoid trapped water and choose => avoid trapped water and choose material carefullymaterial carefully

– Use semi flexible conductor because Use semi flexible conductor because of important magnetic force between of important magnetic force between stripline => can break cablestripline => can break cable

– Heat dissipation of the striplineHeat dissipation of the stripline– Remote design for repairing/exchangeRemote design for repairing/exchange– Need SparesNeed Spares– ……

Safety in the SB FrameworkSafety in the SB Framework


19

Toward a safety WP2 roadmap


20

Design

Design of the SB line : Design of the SB line : • Proton Driver lineProton Driver line• Experimental Hall Experimental Hall

– MW Target StationMW Target Station– Decay TunnelDecay Tunnel– Beam DumpBeam Dump

• Maintenance RoomMaintenance Room• Service GalleryService Gallery

– Power supplyPower supply– Cooling systemCooling system– Air-Ventilation systemAir-Ventilation system

• Waste AreaWaste Area

20

deca

y tu

nnel

(25

m)

spare area

beam

target/horn station

shielding

beam dump

horn power supply and electronics

gallery

hot cell


21

Safety : Elements

MW Target Station :MW Target Station :• Focusing SystemFocusing System• Crane System Crane System • Automated robotAutomated robot• Mechanical structure for the for hornMechanical structure for the for horn• Dose Rate Monitoring System Dose Rate Monitoring System • Residual Dose Rate PlateformResidual Dose Rate Plateform• Operation under helium AtmosphereOperation under helium Atmosphere

– flushing with airflushing with air– filter to measure radioactive pollution (dust, tritium …)filter to measure radioactive pollution (dust, tritium …)

• Investigation of other radionucleides transport Investigation of other radionucleides transport (environmental constraint)(environmental constraint)

• ……


22

Complementary infrastructures

*Schematic diagram of the main *Schematic diagram of the main cooling plantcooling plant

Conceptual design of the SPL II, A high-power superconducting H- linac at CERN – CERN-2006-006 - 12 July 2006SPL Cooling system :SPL Cooling system :

Complementary plants needed for Complementary plants needed for - cooling the 4 horns, decay tunnel and beam dump- cooling the 4 horns, decay tunnel and beam dump - cooling and recirculating helium inside the vessel- cooling and recirculating helium inside the vessel


23

Complementary infrastructures

Conceptual design of the SPL II, A high-power superconducting H- linac at CERN – CERN-2006-006 - 12 July 2006Electrical infrastructure :Electrical infrastructure :

Complementary plants needed for the Complementary plants needed for the super beam infrastruturesuper beam infrastruture - alimentation station for the horns - alimentation station for the horns - air conditioning installation- air conditioning installation


24

Radiation simulation : shielding investigationRadiation simulation : shielding investigation

Target:Target: - - MaterialMaterial : Graphite: Graphite - Cylinder- Cylinder : 130 cm x 4mm (Diameter): 130 cm x 4mm (Diameter)

Shielding for the Target Station :Shielding for the Target Station : - Walls and roofWalls and roof : 80 cm of Iron,: 80 cm of Iron, 8 Slabs (2.5m x 2m x10cm) 8 Slabs (2.5m x 2m x10cm) - Lateral and Front Marble SlabsLateral and Front Marble Slabs- Front Iron SlabFront Iron Slab

Beam Features (CNGS like):Beam Features (CNGS like): - Proton Energy - Proton Energy : 400 GeV/c: 400 GeV/c - Intensity - Intensity : 8.0 10: 8.0 101212 pps pps - Irradiation time : 200 days- Irradiation time : 200 days

Evolution of the DER with time performed Evolution of the DER with time performed with FLUKA 2011.2.3 with FLUKA 2011.2.3

Horn:Horn: - - MaterialMaterial : Anticorodal 110: Anticorodal 110


25


DER (mSv/h) after stopping irradiationDER (mSv/h) after stopping irradiation DER (mSv/h) after 1hour of cooling timeDER (mSv/h) after 1hour of cooling time

DER (mSv/h) after 1day of cooling timeDER (mSv/h) after 1day of cooling time DER (mSv/h) after 1month of cooling timeDER (mSv/h) after 1month of cooling time


26


Target:Target: - - MaterialMaterial : Titanium: Titanium - Cylinder- Cylinder : 78 cm x 1.5mm (Diameter): 78 cm x 1.5mm (Diameter)

Shielding for the Target Station :Shielding for the Target Station : - Walls and roof: 80 cm of Iron,Walls and roof: 80 cm of Iron, 8 Slabs (2.5m x 2m x10cm) 8 Slabs (2.5m x 2m x10cm) - Lateral and Front Marble SlabsLateral and Front Marble Slabs- Front Iron SlabFront Iron Slab

Beam Features:Beam Features: - Proton Energy - Proton Energy : 4,5 GeV/c: 4,5 GeV/c - Intensity - Intensity : 18. 10: 18. 101414 pps pps - Irradiation time : 200 days- Irradiation time : 200 days

Evolution of the DER with time performed Evolution of the DER with time performed with FLUKA 2011.2.3 with FLUKA 2011.2.3

Horn:Horn: - - MaterialMaterial : Anticorodal 110: Anticorodal 110

ConcreteIron

Marble


27


DER (mSv/h) after stopping irradiationDER (mSv/h) after stopping irradiation DER (mSv/h) after 1 hour of cooling timeDER (mSv/h) after 1 hour of cooling time

DER (mSv/h) after 1 day of cooling timeDER (mSv/h) after 1 day of cooling time DER (mSv/h) after 1month of cooling timeDER (mSv/h) after 1month of cooling time


28

Radiation simulations : Four Horn StationRadiation simulations : Four Horn Station

Four horn station layoutFour horn station layout

Chemical composition of Chemical composition of Material:Material:

Target => Ti(100%)Target => Ti(100%)

Horn => Horn => Anticorodal 110 alloyAnticorodal 110 alloyAl (95.5%), Si(1,3%), Mg(1,2%), Cr(0.2%), Al (95.5%), Si(1,3%), Mg(1,2%), Cr(0.2%),

Mn(1%),Mn(1%), Fe (0.5%), Zn(0.2%), Cu(0.1%)Fe (0.5%), Zn(0.2%), Cu(0.1%)

Decay Pipe => Decay Pipe => Steel P355NHSteel P355NHFe(96.8%), Mn(1.65%), Si(0.5%), Cr(0.3%), Fe(96.8%), Mn(1.65%), Si(0.5%), Cr(0.3%), Ni(0.3%), C(0.2%)Ni(0.3%), C(0.2%)

Tunnel => Tunnel => ConcreteConcrete O(52.9%), Si(33.7%), Ca(4.4%), Al(3,49%), O(52.9%), Si(33.7%), Ca(4.4%), Al(3,49%), Na(1,6%), Fe(1.4%), K(1,3%), H(1%), Na(1,6%), Fe(1.4%), K(1,3%), H(1%), Mn(0.2%), C(0.01%)Mn(0.2%), C(0.01%)

Surrounding Environment => Surrounding Environment => MolasseMolasseO(49%), Si(20%), Ca,(9.7%), Al(6.4%), O(49%), Si(20%), Ca,(9.7%), Al(6.4%), C(5%), Fe(3.9%), Mg(3.2%), K(1%), C(5%), Fe(3.9%), Mg(3.2%), K(1%), Na(0.5%), Mn(0.1%)Na(0.5%), Mn(0.1%)


29

Simulations : Energy deposition for the Four Horn StationSimulations : Energy deposition for the Four Horn Station

Beam dump energy deposition (kW/cm3)Beam dump energy deposition (kW/cm3) Energy deposition (kW/cmEnergy deposition (kW/cm33) in the all layout) in the all layout

Beam dump energy deposition (kW/cm3)Beam dump energy deposition (kW/cm3)Target station energy deposition (kW/cm3)Target station energy deposition (kW/cm3)

Transverse viewTransverse view

Front viewFront view




30


Evolution of the target activity with cooling time:Evolution of the target activity with cooling time:

Radioactivity after 1 day (Bq.cmRadioactivity after 1 day (Bq.cm -3-3))

Radionucleides after 1 day (Z,A)Radionucleides after 1 day (Z,A)


31


Evolution of the horn activity with cooling time:Evolution of the horn activity with cooling time:

Radioactivity after 1 day (Bq.cmRadioactivity after 1 day (Bq.cm -3-3))

Radionucleides after 1 day (Z,A) Radionucleides after 1 day (Z,A)


32

Radiations simulations : Four Horn StationRadiations simulations : Four Horn Station

DER (mSv/h) after 1d of cooling timeDER (mSv/h) after 1d of cooling time DER (mSv/h) after 1m of cooling timeDER (mSv/h) after 1m of cooling time

DER (mSv/h) after 6m of cooling timeDER (mSv/h) after 6m of cooling time DER (mSv/h) after 1y of cooling timeDER (mSv/h) after 1y of cooling time

Evolution of the horn activity with cooling time:Evolution of the horn activity with cooling time:


33

Radiation simulations : All LayoutRadiation simulations : All Layout

DER (mSv/h) after 1d of cooling timeDER (mSv/h) after 1d of cooling time DER (mSv/h) after 1m of cooling timeDER (mSv/h) after 1m of cooling time

DER (mSv/h) after 6m of cooling timeDER (mSv/h) after 6m of cooling time DER (mSv/h) after 1y of cooling timeDER (mSv/h) after 1y of cooling time


34


Next Steps :– Full Design simulation of the installation– Contribution of each element to the dose rate– Individual and collective dose rate calculation

with cooling times– Intervention Scenarios (normal operation,

maintenance, emergency….)– Costing

Documents

Safety issues for WP2 E. Baussan on behalf of WP2