CFS schedule and risks Nobuhiro - PowerPoint Presentation

1. CFS schedule and risksNobuhiro Terunuma, KEK

2. This presentation consists of followings.Expected Schedule by CFS viewpointALCW2018, Fukuoka, May 2018CFS risks discussed in SCJ meetingsLCWS2018, Arlington, October 2018

3. CFS timeline on “Pre- and Preparation Phase”CFS Timeline, Nobuhiro Terunuma (KEK), 29 May 2018, ALCW2018, Fukuoka.Basic Design linked to CFS should be fixed. Exception: Positron SourcePrepare designs for all possible schemes by (A) Scheme choice should be done by (B)?Our possible contributionminor correction only(B) Selection of Positron Source SchemeAccelerator layoutbeamlineRequirement of Utilitiesspecification and routepower suppliesNote: This timeline has been discussed and reached a consensus by the KEK LC-CFS members.M. Miyahara,H. Hayano,N. Terunuma,S. Michizono,K. Yokoya

4. Common issues for the central region are…Countermeasure against accidentsEarthquake, fires, …RadioactivesShield wallsMeasure for a leak of beam dump water (accumulated Tritium) Air control/managementPower failuresTunnel structure and GroundwaterA proposal to measure the long-term power blackout (arises in the SCJ discussions.) CFS risks discussed in SCJ meetings

5. Major questions:Soundness of beam dump design Countermeasure against accidentsTunnel wall and a radiation shieldHandling of the spring water leaked into the tunnelAnswers:Design margin on 18MW(1 TeV ILC) beam dump which will be used for 250 GeV ILC.Radioactive products and their physical propertyCountermeasure against the dump water leakage; i.e., handling of the Tritium waterConcept of radiation control areas and shieldsIssues on Radiation Safety

6. LCWS2018 ILC accelerator by S.Michizono

7. Accelerator TunnelBeam DumpDump RoomAccelerator TunnelNon-activated waterBDS to IPWindowDump ShieldDump water systemDump Utility Roomwater storage /drainRadiation Safety Concept of Beam Dump Area HEXLayered Radiation Control AreasActivated water (Closed loop)Utility roomDump room

8. TDR beam dump designILC-250Beam energy500 GeV125 GeVMax. temperatureCirculating Water：155℃Beam window(1mm)：74℃Circulating water：73℃Beam window(1mm)：82℃Recent R&DWindow  max.5 mmBeam window(5mm)：110℃Beam window(5mm)：115℃Water pressure10 atm（Boiling point 180℃）3 atm（Boiling point 133℃）Speed of water from the broken windowPin-holeRepeat leak, freeze, thaw, leak (to the beam pipe)Many experiencesBigger holeSlower speed than the small-holeWater speed(small hole)Max. 45 m/sMax. 24 m/sBeam dump water8

9. LCWS2018 ILC accelerator by S.Michizono

10. Multiple shutoff valves and minimize contamination rangeDetailed design of the dump line will be done during preparation phase.Countermeasure of Beam window failureDump line300 mBeam dump(activated water)Valve/drainDetect water leakage-Vacuum monitor-Leakage monitorA few milliseconds responseDump beam line shutdownHigh speed vacuum gate valve~ 40 ms response speedKeep the leakage in the beam pipe of the dump lineBeam abortStop circulating waterOpen recovery valve and collect and store in drainBeam window exchange / restoration~ 100 msec (from leakage detection to high-speed gate valve shutdown)10water pressure：10atm 3atmspeed: 45m/s 24m/s

11. Beam dump has been designed for 17MW at 1TeV and has a margin for 250GeV.To avoid a long-years shutdown if a heavy activated dump is broken, 2nd beam dump has been proposed. Beam Dump Activation and 2nd Beam DumpWindowworking areaOP.YearsRadiation doze of working area after beam stop(mSv/h)Upper: at windowLower: 1m from the windowUpper: maximum of side areaLower: minimum of side area1 mo1 y5 y1 mo1 y5 y1y1051418310.21571320.220.015y13023　30730.82070.9560.440.0310y14025358512111600.580.05Beam Windowside areaFLUKA simulation: 125GeV beam, nominal intensity, 5000h/yearDump waterWindow chamberClamp-chainflangeExample of window connection

12. Countermeasure against a groundwater activationShields are designed to make an activation of the underground water well below the concentration limit by law.Heavy beam loss area such as a beam dump should have an enough localized shield.ML is low loss and the activation is lower than the concentration limit even for the dark current.Example for the beam dump shieldsBeam dumpLocal shielding by Iron and ConcreteAll direction must be covered by enough amount of shields.Utilities for dump waterDump RoomBDS beamlineGranite

13. Major discussions link to the CFSRadiation safetyBeam dump and its Tritium waterLong-term power blackoutSpring water around the tunnelEnvironmental assessment

14. Emergency response at ILCILCLEP/ LHCPower failure<30 sec.：Battery（Control, monitor）>30sec.：Emergency generator（light, drainage, He storage ）（Note：He system should be kept <+1atm. Quick storage will be necessary.）<3 days：power recovery　(Generator fuel stockpile）<30 sec.：Battery（Control, monitor）>30sec.：Emergency generator（light, drainage）（Note：He system can be ~20atm.）<1 days：power recovery　(Generator fuel stockpile）Fire Kamaboko-tunnel, Retreat to non-fire side/tunnel -> evacuation The air conditioning circulation speed is controlled below the moving speed of a person. Evacuation faster than smoke (distance: <2.5 km + access tunnel)Note: Fire-resistive cableRetreat to non-fire side -> evacuation The air conditioning circulation speed is controlled below the moving speed of a person. Evacuation faster than smoke (distance: <3.4 km + elevator)Note: Fire-resistive cableHe leakageCarry an oxygen tank, retreat along the tunnel bottom(He diffuses and stays at the top of the tunnel)(No liquid nitrogen underground)Other than He leakage point (Cryo-unit), normal He recoveryCarry an oxygen tank, retreat along the tunnel bottom(He diffuses and stays at the top of the tunnel)(No liquid nitrogen underground)Other than He leakage point (Cryo-unit), normal He recoveryEarthquakeStand by next to stable large equipment.Evacuate after the decay of the shake.Note: Earthquake vibration is relaxed to ~ 1/5 level at depth of 100 mNo large earthquake experience in this area.No special guidelines.Spring waterDetection at advanced pit, drainage enhancementEvacuate to the beam tunnel side (no drain pump) · evacuate.In case of overflowing spring water, via service tunnel, detector hall → radiation monitor → natural drainage.Prevention of spring water by the freezing method of the surrounding soil (during CMS shaft construction)There is no large spring water in tunnel after completion of construction. Trace amount of spring water is pumped up, radiation monitor and drainage.Tunnel access・License/EquipmentIssue license after lecture and examinationEquipment at entry: - ILC-ID (Licensed) - Radiation worker batch (with monitor) - Helmet (LED search light attached - Portable oxygen tank (<30 minutes), - Oxygen concentration meter (with alarm) · Bicycle, electric working vehicle (option)Issue license after lecture and examinationEquipment at entry: - CERN-ID (Licensed) - Radiation worker batch (with monitor) - Helmet (LED search light attached - Portable oxygen tank (<30 minutes), - Oxygen concentration meter (with alarm) · Bicycle, electric working vehicle (option)LCWS2018 ILC accelerator14LCWS2018 ILC accelerator by S.Michizono

15. Countermeasure against the Power failureILCLEP/ LHC< 30 sec.Battery（Control, monitor）Battery（Control, monitor）> 30sec.Emergency generator（light, drainage, He storage ）（Note：He system should be kept <+1atm. Quick storage will be necessary.）Emergency generator（light, drainage）（Note：He system can be ~20atm.）More…< 3 days: power recovery　(Generator fuel stockpile）< 1 days: power recovery　(Generator fuel stockpile）15

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17. Major discussions link to the CFSRadiation safetyBeam dump and its Tritium waterLong-term power blackoutSpring water around the tunnelEnvironmental assessment

18. Drainage concept of Underground WaterAmount of spring water estimated by results of tunnels in JapanTotal amountSpring water/pumpGeoid tunnelLaser straight

19. ILC tunnel optimization (Tohoku survey)ILC加速器およびアクセストンネルの検討Tunnellength (m)Existing road -> Access hallAcc. tunnele-: RTML-turn ML BDS e+: BDS ML RTML-turn {Total} 2,4384,9503,4892,3614,7952,516{20,500}Access tunnel： (w=8 m, h=7.5 m) AT-10 AT-8ATDRATDHAT+8AT+10{total}1,503691763693283943　{4,876}adjacent~50 madjacentadjacentadjacentadjacentNatural drainage (Option)　　　　4,335Note: Tunnel and ground access optimization:Tunnel to good rock, altitude capable of natural drainage,Ground facility adjacent to an existing roadShorten access tunnel lengthAccess downward slope: <10% (average <9%)Optimization support by tunnel optimization program (TOT) (CERN - KEK - Tohoku cooperation)PM-8PM-10PM+8PM+10(underground)e-LinacCollision pointAT-10AT-8AT DRAT DHAT+8AT+10(ground）Natural drainage(Option)e+Linac19Ground facility adjacent to existing roadPitheadGround facilityExisting road

20. Example: Standard structure of the tunnelSpring WaterLining Concrete（30cm） Before Linings(waterproof sheet)Frame for LiningsDrainage trench

21. 21ILC tunnel drainage conceptLCWS2018 ILC acceleratorNatural spring water (unmanaged drainage)Collect the water in underground reservoirPump up to the ground Periodical water quality checkLong power failure(>3days)　Detector hallNatural drainage (to the river)Water quality check(periodical)When pumping pump stops: Natural spring water can overflow to service sideReservoirReservoirWater quality check(periodical)Radiation checkRadiation checkDrain (outside tunnel)Beam tunnelService tunneldraindrainReservoirTunnel inside drain (managed drainage)Store the water in access hole reservoir.Confirm radiation dose and release.Access hallILC candidate site is under mountain but ~100m higher from sea level.(Natural drainage to the river is possible.(optional))

22. 22Rey.hori/KEKBird’s eye view of ILC in Kitakami candidate siteelectronpositronH. Hayano, LCWS2018

23. Plan of Interaction point5GeV damping ringTunnel (3.2km)Interaction Point (IP)5GeV damping ringTunnel (3.2km)Electron accelerator tunnelPositron accelerator tunnelUnderground Detector HallVertical ShaftSurface IP canpusAccess tunnelAccess tunnelelectronpositronGantry CraneH. Hayano, LCWS2018

24. e+2: DR e+ extraction dumpe-5: e- Main dumpe-1: e- Source Tuneup dumpe+4: e+ BDS tuneup dumpDump-room location in the acceleratorView 2*Dump room location will be fixed after the new-lattice design fixedH. Hayano, LCWS2018

25. e-2: DR e- extraction dumpe+5: e+ Main dumpe+7:Photon dumpe-4: e- BDS tuneup dumpe+1: Source tuneup dumpDump-room location in the acceleratorView 3*Dump room location will be fixed after the new-lattice design fixedH. Hayano, LCWS2018

26. Summary: Main Beam Dump and AroundCFS consideration on the main dump and around, Nobuhiro Terunuma (KEK), 29 May 2018, ALCW2018, Fukuoka.1st Main DumpReserved for 2nd DumpUtility Cavern for main dumpReserved for 8MW e- dump(5+5Hz)Reserved for Muon wallWhere the 2nd-loop water come from?Positron Linac Tune-up Dump (60kW)Photon Dump (120kW) IPDRPositron SourceTime for the CFS engineering design is limited.Fix beamlines, location and size of systems!26/18

27. Major discussions link to the CFSRadiation safetyBeam dump and its Tritium waterLong-term power blackoutSpring water around the tunnelEnvironmental assessment

28. ILC ground facility (reference: LEP/LHC/P4)LCWS2018 ILC accelerator28LEP/LHC/P4：Cut high slope to the leftILC Ground facility outline.The left side is the entrance of the access tunnel(“Tohoku” plan) Ground building overviewestablish a campus design to preserve the landscape.(After dialogue with residents of the village on the mountain side)Access tunnel

29. 29surface design IP area　78,500m2 154kV receive66kV co-generationLNG for co-generationHe compressor & tanks154kV to 66kV TransWater chiller & pumpsAir intake/exhaustIP detector assembly buildingILD&SiD detector preparation building computing building research building Plan of Interaction Point Campus at SurfaceGantry CraneH. Hayano, LCWS2018

30. Thank you for your attention!