jsns2 detector construc0oncarott/kps_pioneer_symposium... · 2017. 10. 24. · jungsic park, kek...

JSNS2DetectorConstruc0on

JungsicParkHighEnergyAcceleratorResearchOrganiza0on(KEK)

withJSNS2Collabora0on

27Oct,2017KPSFall2017,HICO,Korea

JungsicPark,KEK KPSFall2017 1

•  ConceptoftheJSNS2Detector-Target/Catcher/Veto-Op0calseparator•  PMTInstalla0onscheme•  Produc0onofGd-LS/LS– DayaBay/RENO•  Filling/extrac0ngscheme•  Calibra0on/Monitoring

•  Summary

Contents



ConceptoftheJSNS2Detector

Target(Gd-LS)

Veto(LS)

Catcher(LS)Op0cal

separator

An0Oil-LeakTank


Radius[m] Height[m] Filledwith Volume[m3] MaterialTarget 1.6 2.5 Gd-LS 19.3 AcrylicCatcher 1.85 3.0 LS 35

intotal**

Veto 2.3 3.5 LS Stainlesssteel

An0oil-leaktank

3.3 2.7 air 84 Stainlesssteel

-Target+Catcher193,8inchPMTs(Barrel:24×5,Top/Bodom:36with3rings)-Veto48,5inchPMTs

Op0callyseparatedwithPMTstructuresè  LScanpassingthroughbetween“Catcher”and“Veto”region

ConceptofJSNS2Detector

**


StatusofPrepara0onofDetectorvessels

Acrylicvessel-Underprepara0onofdetaileddesign/biddingdocuments-BiddingwillbestartedaroundnextAprStainlesssteel-Finishedthebiddingprocedure-Morimatsuwinthebid(hdp://www.morimatsu.jp)


Detailedschedulewasmadebycompany.èConstruc0onwillbefinishedun0lMar,2018.

Construc0onscheduleofVetovessel+An0-oilleakTank


Op0calseparatorwithPMTSupportStructures

Barrel-5PMTsinonecolumn-FrameismadebyL-angle

3mmthickness

Top/Bodom-Threeringshape(6,12,18PMTs)-FrameismadebyL-angle


PMTposi0ons

Sideview Topview

-DrewwithMC


AssembleCoverstoPMTs

ThreedifferentlayerstocoverindividualPMTs-BlackPET:AvoidflashingfromPMT-FINEMET:Shieldingofmagne0cfield-RuireMirror:Increasereflec0vitytoincreaselightcollec0onefficiencyofVeto

InnertoOuter


AdachPMTtoL-angle

L-angle

Supportring

U-shapesupporter

FrontView

RearView


Installa0ontestofBarrel/Bodompieces


MonteCarlostudieswithposterpresenta0on

-StudyofPMTconfigura0onintheJSNS2experiment.byHyoungKuJeon,P2-pa.124-StudyofEffectofPMTTiltonChargeCollec0onintheJSNS2DetectorbySanghoonJeon,P2-pa.128


Produc0onofGd-LS/LS

ProduceatRENOsiteanerrefurbishingtheproduc0onfacility.


Produc0onofLSProduc0onschemeatRENOsite


Produc0onofGd-LS

Or,thereispossibilityofDona0onfromDayaBay.-Gotposi0veresponsefromSpokespersonofDayaBayatJul,2017.-Lederofdona0onisunderdiscussion.

Produc0onschemeatRENOsite

17.5.12. JSNS2CollaboraHonMeeHng 16

-Ifemergencyishappenatmercurytarget,detectorisrequiredtobemovedwithinoneweek.èFillingorextrac0ngshouldbefinishedwithinfewdays.-FlowpathofGd-LSshouldbenotanymetallicmaterial.èMEGA960fromTREBORcompany.(DCalsousedit)FlowpathismadebyPFA/PTFEMax95LPM(5.7ton/hour),5.5msuc0onlin.-Liquidheightoftarget,gamma-catcher,vetoshouldbesimilar.èNeedtoinstallflowmeter,anddistancemeasurementsensor.-Filterwillbeusedtopreventdust.

Fillingandextrac0ngofGd-LS/LS


pump flowmeter filter

pump flowmeter filter

Gd-LS

LS

Target

Veto

Fillingpipe

Reverse-siphon

Level-stabilizerTank

Fillingstage(Image)


Gd-LS

LS

LSstage1:LS

stage3:LS+Gd-LS+LS

stage5:LS+chimney

LSLS

LS

op0callyseparated

stage4:LS+chimney+LS(mostdangerouspart)

stage2:LS+LS

Fillingstage

stage6:LS+chimney

-Weassumedthatevenwithop0callysepara0on,liquidcangothroughbetweengamma-catcherandveto.(stage1,2andstage4,5canbecombined)


FlowrateFlowrateisroughlypropor0onaltoarea.-VolumeofPMT,op0callysepara0on,installa0onpart(~4000L)isconsideredevenly.-Maxflowrateisassumedto30LPMinreality(30%ofmaximumcapacity).

Target[LPM]

Catcher+Veto[LPM]

Height[cm]

VolumeTatget[L]

VolumeC+V[L]

Time[h]

stage6 0.1 1 12 4+tank tank’ few

stage5 0.1 30 25 8 4000 2.2

stage4 0.1 30 25 8 4000 2.2

stage3 30 29.5 250 19350 19000 10.8

stage2 0 30 25 0 4000 2.2

stage1 0 30 25 0 4000 2.2

Total 19370 35000 19.6

DetectorInforma0on.Target:160cm(Outerradius),250cm(Innerheight),chimney(10cmradius),30mmthicknessCatcher:25cm,25cm(top/bodom,side)Veto:25cm,45cmthickness(top/bodom,side)


filter flowmeter pump

filter flowmeter pump

Gd-LS

LS

Target

Veto

Fillingpipe

Reverse-siphon

Level-stabilizerTank

Extrac0ngstage(Image)

-  Exchangeposi0onofpumpandfilter.-  Pumpandflowmetershouldbeonthetopofdetector.

OverviewofCalibra0on

Energyconversionfunc0on:Numberofphotoelectrons(PMTs)èMeV-Needtoconsidernon-linearityduetoquenching-almostconstantvalueathigherenergy-Promptsignalcomsfrom“positron”PossibleInforma0onfrom-Radioac0vesource:137Cs,68Ge,60Co,252Cf,...-Neutroncapturedfromdata:n-H,n-C,n-Gd,...-Con0nuousspectrum:12B,MichelelectonPossiblecorrec0onfromMonte-Carlosimula0on-Differencebetween“gamma”and“positron”-Differencebetween“singlegamma”and“severalgammas”-Differencebetween“fixedvertexposi0on“and“uniformlydistributedattarget”Checkofstabilityaccordingto“0me”and“spa0aldistribu0on”.

p.e./MeV = P1− P21−exp(−p3*E −P4)Oneofcandidateè

JungsicPark,KEK JPSFall2017 21

StudyforCalibra0on(LowEnergy)

MC:Positron(Promptsignal)atcenter(10,000p.e./MeV)

p.e./MeV = P1− P21−exp(−p3*E −P4)

Possibleradioac0vesources

68Ge:1.022MeV60Co:1.17+1.33MeVn-H(fromdata):2.2MeVn-Gd(fromdata):~8MeV252Cf:neutron


Almostflat

Applied225p.e./MeVsharpdecreasearound53MeVasexpected

StudyforCalibra0on(HighEnergy)

MC:Michelelectron(10,000p.e./MeV)-Orderof100Hzisexpectedatdatatakingperiod



Monitoringsensors

•  TheJSNS2experimentispreparingtoperformsterileneutrinosearchatJ-PARC.èDirecttestofLSND•  Stainlesssteelvesselwillbeconstructedun0lMar,2018.

•  PMTinstalla0onschemeisunderdevelopmentwithmock-uptest.•  LSwillbeproducedfromRENOsiteanerrefurbishment.(Gd-LSalsocanbeproducedfromRENOorpossibledona0onfromDayaBay)•  Manyeffortsison-goingforfilling/extrac0ng/calibra0on.

•  AimtostartexperimentatJFY2018.

Summary



backupslide

Usualmagne0cfiledstrengthèaround1000mG-Measurementwasperformedwithmagnetometer.-Fluxmaster,upto2000mG.-Reproducibilitywasmeasured~10mGateachdirec0on.Loca0on-24mbaseline-5points-2differentheight(floor,1.3mheight)Threeperpendiculardirec0onBeamDirec0on X

YZ

2.2m

2.2m

Magne0cfieldstrengthmeasurement(ForDecisionofFINEMET)


24mFloor

X(mG) Y(mG) Z(mG) Total(mG)

1 -227 15 -233 3262 -291 -97 -82 3183 -71 -36 -465 4724 -353 -24 225 4195 -478 10 -40 480

24m1.3mheight

X(mG) Y(mG) Z(mG) Total(mG)

1 -309 -3 -233 3872 -317 -20 -186 3683 -292 -22 -159 3334 -336 18 -140 3645 -378 -5 -92 389

Magne0cfieldstrengthè300to500mGwithoutFINEMET


EffectofFINEMET:preventeffectfrommagne0cfield

Measuredmagne0cfiledaton-site:30– 50μTèPrepared2layersofFINEMET

Before Aner Before Aner

387 111 -360 -170

-486 -49 471 284


Measuredmagne0cfieldbefore/anercoverwithFINEMET.-Onecomponentofdirec0on

cf)Weputouterlayertoinsideonlyfordemonstra0onpurpose.

-DatatakingwithFADC-2layersofFINEMET-UsedBlueLEDwithNIMmoduletomatchsinglephotonelectron

EffectofFINEMETtoPMTgain

LEDOn(Signalcase)

LEDOn(Nosignalcase)

LEDOn(Signalcase)


Typicalsignalshape

30nsintegra0onwindow

SinglegaussfixngSPEpeak:19.5è22.2(14%increase)

EffectofFINEMETtoPMTgain



Howmanymichelelectronwillbehappenedinsideofdetector

Target(Gd-LS)

Stainlesstank(LS)

1.75m1.25m

2m

1.6m

2.3m

3mGeneratedvertexofmuon(squareshape)

-Generatevertex,momentumofmuonanerconsideringcos2θdependence-2Mevent


Roughes0ma0onofrateofmichelelectronatdetector.

Efficiency=NumberofMichelelectronattarget/NumberofIncidentmuons

Below100MeV,muonwasstoppedatcatcherorveto.Morethan1GeV,muonusuallypassingthroughdetecto

17.9.8. JSNS2RegularMeeHng 34


Muonfluxatsealevel

17.9.8. JSNS2RegularMeeHng 35

Efficiencyofmichelelectronwithmuonfluxè Areaof“muonflux*michelefficiency”/Areaof“muonflux”è 5.1%Assumedmuonrate:1Hz/10*10cm2

Areaofdetectorsurface:160cm*160cm*3.14(top)+2*3.14*160cm*250cm(side)=331584cm2

è3.3KHzMichelelectronrate:3.3KHz*5.1%=172Hz(orderof100Hz)èEnoughsta0s0cstogetwhiledatataking



Cross-checkbyFuruta-san

1000events/4min,withuniformdistribu0on

jsns2 detector construc0oncarott/kps_pioneer_symposium... · 2017. 10. 24. · jungsic park, kek...

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