yper K amiokande Water system amp water flow Open Meeting for HyperK Project Aug 23 2012 1 Hiroyuki Sekiya ICRR University of Tokyo for the HyperK Working Group Basic idea ID: 1045945
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1. Basic Water plan for Hyper-Kamiokande -Water system & water flow-Open Meeting for Hyper-K Project Aug 23 2012 1Hiroyuki SekiyaICRR, University of Tokyofor the Hyper-K Working Group
2. Basic ideaBase design is Super-KamiokandeIn order to study same/beyond physics achieved by Super-K, water quality in Hyper-K must be same as /better than that in Super-K. We know Super-K water works quite well as 50kton target material with 60t/h recirculation flow rate and the water purification technology is well matured. For 1Mton target, the purification flow rate should be more then 1200t/h.It’s quite huge and it is not trivial. The feasibility must be checked.2
3. Purpose of this sessionFeasibility check of “1Mt ultrapure water Cherenkov detector” Mine water survey.1200t/h water purification system design.Keeping 1Mt ultrapure water in the tank. (This is the challenge!) 350kt tank 60t/h flow→14MWcm800t tank 5t/h flow →17.7MWcm
4. Purpose of this sessionExplore “functional water”Adding some materials into water could enhance Hyper-K physics potential. Gd Option (Mark Vagins) Liq. Scintillator Option (David Jaffe)However, these require additional technical studies. Ex) reaction with detector material, concentration uniformity, purification method, keeping quality in 1Mt tankThese technology might be applied to near detectors.4
5. Ultrapure water Cherenkov detector5
6. Mine water surveyAt Mozumi cite, we have information and experience.We surveyed Tochibora cite water6HyperKSuperK2700mwe1750mwe
7. Tochibora Mt. Nijugo(二十五山)
8. 30mシックナー鉛リサイクル工場硫酸工場亜鉛製錬工場金属粉工場下部清水下部清水上部清水鹿間発電第三ポンド栃洞鉱山３００ｔ水槽５０ｔ水槽１５０・１６０・１７０KWポンプ総合調整池硫酸３０ｔ水槽孫右衛門０ｍポンド２８，４２０㎥/day3,456㎥/day13072 t/day5687 t/day繰り返しポンプ工業用水（１２月平均データー）硫酸２００水槽下部濁水９,000㎥//day（推測）-430m-370m水温 ７．５℃水温 １０．３℃（山側）水温 ８．２℃（川側） ＊ 排水処理設備は省略8346 t/day ＊ 季節変動有984㎥//day底設暗渠清水Total spring in Tochibora mine is 540t/h and all the water is used for the smelting factory During the initial supplying, we have to ask to let us use (i.e. stop their operation).The problem: Shortage of mine water
9. Quality of Mine water
10. Mine water qualityAlmost same as Mozumi mine water : pretreatment is not necessary like SK system. MozumiTochibora
11. reject (drain)reject (drain)mine waterdrainrejectPrimary pumpfilterfilterRO-1 pumpRO-2pumpRO water tankpost RO pumpRO-2RO-1-1vacuum degasifierRO-3rejectRO-3 pumpIon exchanger 1/2UVsterilizerpurified water supply pump A/BABSKtankultra filtermembrane degasifierreject 550Rn-free-air dissolving tankPI-1PI-2PI-3PI-8PI-9PI-API-BstrainerFI-1FI-2PI-5PI-11PI-18FI-10FI-101PI-20TIA-2FI-6FI-7FI-204FI-5FI-3FP-4 FP-5FI-202RT-3RT-4RT-2RT-1CIA-1CIA-6CIA-2CIA-3CIA-4TI-101CV-1IDbottomFI-IDCIACV-2v94700compensation pumpstrainerUF reject tankHE1rejectHE3rejectUF reject pumpreturn pump HE4PI-CRO-1-2Super-K water system
12. Matured technology12Filtrations & Deionization(General technology)Radon Degasifying(Super-K technology) Radon free air generatorRadon removal with membrane degasifier MFUFNFRODIUV sterilization (General technology)
13. Hyper-K water system13
14. CompressorDryer0.3mm filterBufferH2O,CO2 remover20oCCharcoal0.1mm filter0.01mm filter0.01mm filter-40oCCharcoalBuffer10mm filterBuffer CO2 remover Buffer 1mm filterHK TankRn Free Air generator (400Nm3/h)Water Purification System0.3kt/h for initial supplyMine waterRODI(MB)DI(CP)UVMDUFT controller1.2kt/h for recirculationpurgepurgepurge
15. Mine waterconsumption 24h x 407t/h /dayPure water 300t/hIt takes 70 days for filling one tank. 140 days for 1M tonFilling mode1st stage is common for both tank2nd stage for each tank.Does not work at the same time
16. Mine waterConsumption 2h x 28t/h /day 600t/h 600t/hIt takes 35 day to process 1Mton waterRecirculation mode1st stage is used for UF reject water and compensation water RO reject 56t/hNo RO in the recirculation systemRO requires high pressure pumps high running cost large space
17. 58m58m13m13m13m13m＜1次純水装置・ラドンレス 空気製造装置エリア＞1st stage layout●58mL×13mW 断面： 13mW×13mH
18. 32m32m11m11m12m11m＜サブシステムエリア＞2nd stage layout●32mL×11mW 断面： 11mW×12mH このエリアが２つ必要となります。
19. Including400Nm3/h Rn Free Air generatorMan power and cost for initial filling30 Oku-YenEstimated Cost
20. Keeping water quality in huge tanks with limited flow20
21. Super-K water transparency21anti-correlated with Supply water temperature@ Cherenkov light wavelengthMeasured by decay e-e+ from cosmic m-m+ SK-IVSK-IIIStarted automatic temperature control
22. Convection suppression in SKVery precisely temperature-controlled (±0.01oC) water is supplied to the bottom.223.5MeV-4.5MeVEvent distributionReturn toWater systemPurifiedWater supplyr2Temperature gradation in ZThe difference is only 0.2 oC
23. ID bottomOD bottomOD topID,OD top12t/h12t/h36t/h60t/hVer.14May 2012 Current SK situationStagnation and top-bottom asymmetry.Emanated (from PMT/FRP) and accumulated RadonBacteria in low flow rate region
24. Well-balanced operation in SK1st priority for lowE low BG (BG) ≡ stagnation1st priority for atmpd/T2Ksmall systematic errors ≡ uniformity ≡ convectionA 6%-level top-bottom asymmetry of water transparency exists, however the systematic error on the SK energy scale due to this is below 0.1%-level after correction*.The operation strategy is determined by physics motivations* see calibration session
25. For bacteria free and uniform (High-E oriented) Hyper-KO3 or UV sterilizer in the tank is not good for PE surface. PE may get damaged and emit particles. So far, continues high speed flow is the only solution to suppress bacteria in the tank.To make the most of the “1200t/h flow rate”, water flow design in the HK tank is underway.
26. Water Flow design by finite volume methodOne compartment for the first stepSoftware:ANSYS GAMBIT2.4.1+Fluent13.0
27. Water inlets & outlets conditionEqually distributed per top/bottom cross sectionWill be optimized through this analysis for “EGG shape tanks”SK typeTop outlets IDODBase concept: Supply to bottom and drain from top
28. ID & OD ConditionsID & OD are dealt as completely separated containers.28Inner detectorOuter detectorVolume370,000m389,000m3Flow rate96.7t/h23.3t/hNumber of inlets (outlets) 184Flow rate / inlet (outlet)5.375.82Because of its symmetrical shape, only 1/4 volume is considered for the simulation.1,400,000 mesh(xy, and yz symmetry)
29. Rock and mine water temperatures @Tochibora on May 8 2012Cooling water 10.47oC -300M (Top level) rock 16.7oCHere Boring holeMeasured 1m insideAlmost same as those in Mozumi/SK →assuming supplying 13.0oC water
30. Temperatures @Tochiboraon May 8 2012Boring No2Boring No3Boring No4-370M(bottom level) rock No2 18.38oCNo3 17.59oCNo4 17.07oCBoring No3Average (17.7oC) is close to the nearest No3 value.assuming 17.7oCDepends on position and the variation is large.
31. Other heat source estimation Unlike SK, electronics(HV, QBee,..) are also in the tank.The heat from compensation coil depends on the direction of the tank.47.4kWAreaFor one compartment
32. Preliminary resultsID: fast flow (much faster than 1 day) ~convectionOD : stagnation @upper half like Super-K32ID flowOD flow
33. Water replacement efficiency10 days after starting recirculation33Color scale[0:1] Initial old water: blue The ratio of new water0.3
34. Water replacement efficiency20 days after starting recirculation34Color scale[0:1] Initial old water: blue The ratio of new water0.5
35. Water replacement efficiency30 days after starting recirculation35Color scale[0:1] Initial old water: blue The ratio of new water0.7In ID, uniformly replaced, but the efficiency is not good due to the stir.
36. ConclusionTochibora mine water quality was surveyed.Based on this result and Super-K system, Hyper-K water supply and purification system was designed.Water flow design in the tanks depends on our physics motivation.So far, a water flow tuned for high-E physics is being designed.LowE-tuned water flow will be designed in the case of Mozumi Hyper-K.Can we develop a flow-control system?36
37. Water replacement efficiency10 days37Color scale[0.25:0.3]
38. Water temperature in the tankColor scale [286K:287K]38