DA1-First-Experiments-with-a-Polarized-Hydrogen-Jet-：DA1第一次实验极化氢射流课件

projectortestAPS-DNP2019SessionDA:ProbingtheGluonicandQuarkStructureofMatterprojectortestAPS-DNP2019Ses1DA1.FirstExperimentswitha

PolarizedHydrogenJetTargetinRHIC

WillyHaeberliDepartmentofPhysics,UniversityofWisconsin-Madison

DAProbingtheGluonicandQuarkStructureofMatterMeasuringthePolarizationofHigh-EnergyProtonsWHY?HOW?

APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019DA1.FirstExperimentswitha2

K.RithDIS2019DISofpolarizedHEleptons(e,m)

frompolarizednucleonsatSLAC,CERN,HERA:Goodagreementwithtwoverydifferentexperimentalmethods……….Whataccountsforthespinofthenucleon?

APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019The(old)protonspinpuzzle:Only~(20±4)%ofprotonspinisaccountedforbyspinsofquarksandantiquarksK.RithDIS2019DISofpolar3

two60cmlongTarget-Containerswithoppositepolarization

superconductive

Solenoid(2.5T)3He–4HeDilutionrefrigerator(T~50mK)Dipole(0.5T)COMPASS

polarizedLiDtargetE=160GeV,pB

-76%1.8*107

/sec(timeave)polarizedLiD-target,pT

50%Luminosity:5*1032cm-2s-1Polarization:~50%Dilution40%two60cmlongTarget-Contai4

HERMES

internaltargetFactor100gainfromuseof“storagecell”(S.Price)PolarizedH,Dinjection

ToH,Dpolarimeter

...Purepolarisedgastargets:H,D,targetpolarisation:pT85%targetthickness1014H/cm2Luminosity:6*1033cm-2s-1(D50mA)

spinreversalevery120secHERMESinternaltargetFactor50.1Gluon?Orbital?Gluons:keycontributortotheprotonspin?slideadaptedfromW.Vogelsang(BNL)0.1Gluon?Orbital?Glu6Gluons:MeasurementsofDG/GxgAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019fromF.H.Heinsius,COMPASSCollab-DISApril2019PHENIXandSTARatRHICwillmeasure

DGbycollisionsoflongitudinallypolarizedHEprotons-ALLRHIC:c.m.energiesupto500GeV

Gluons:MeasurementsofDG/Gxg7RHICexperimentswillmeasureDGBUTHOWDOESONEKNOWPbeam?Collidingpolarizedprotonscoupledirectlytogluons(ratherthanviacharge)-measurepartonasymmetries.

Measurepolarizationofgluonsthroughg,jets,ppi’s,heavyquarks.

G.BunceDUBNA-SPIN-03RHICexperimentswillmeasure8TheRHICComplex

50<

Ös

<500GeV

STARPHENIX

SpinRotators20%SnakePHOBOS

SiberianSnakes

presentperformance:L=4x1030s-1cm-2,Pbeam~40%5%Stons/bunch56bunchesBRAHMS&PP2PPAGSLINACBOOSTERPol.ProtonSourceSiberianSnakes200MeVpolarimeterRfDipolesAGSp-CpolarimeterRHICp-Cpolarimetersabsolutepppolarimeter+-+-+-++--++RHICTheRHICComplex50<Ös<5009

WhatmechanismissensitivetoPathighenergy?

NeedtoknowanalyzingpowerA.

MeasuringpolarizationofprotonbeamReversePtoeliminateinstrumentalasymmetryAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019Whatmechanismissensitivet10MagneticMomentScatteringMott(1929),J.Schwinger(Phys.Rev.73,1948)+mmAnalyzingpowerinsmall-angleneutronscattering…..“Itisthepurposeofthisnotetosuggestasecondmechanismforpolarizingfastneutrons-thespin-orbitinteractionarisingformthemotionoftheneutronmagneticmomentintheinthenuclearCoulombfield.”APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019Spin-orbitcoupling:MagneticMomentScatteringMott11APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019Coulomb-nuclearinterference(“CNI”)

Phil.Mag.1,175(1956)1010%sPU(n,n)U100MeVAPS-DNPW.12FNALE704200GeV/cPhys.Rev.D48,3026(1993)ANvsmomentumtransferPolarizedprotonsfromHyperondecay(lowrate)CNIAnalyzingPowerinHigh-EnergyppScattering

FNALE704200GeV/cANv13E950BNLp=21.7GeV/cPhys.Rev.Lett.89(2019)withhadronicspin-flipnohadronicspin-flipmomentumtransfer[(GeV/c)2]CNIAnalyzingPowerp-CarbonScatteringcalibrationonlyat22GeV/csmallANScaleuncertainty~30%UnknownenergydependenceButlargecountratesneedforaccurateabsoluteANmeasurementE950BNLwithhadronicnohadroni14BeamPolarizationCalibrationMeasureasymmetryetgtwhenunpolarizedbeamisscatteredfrompolarizedtargetofKNOWNpolarizationPt-measuresAMeasureasymmetryebeam

whenpolarizedbeamisscatteredfromunpolarizedtargetElasticscatteringofIDENTICALparticles(pp):beamanalyzingpower=targetanalyzingpower(Changeinreferenceframe)

APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019BothexperimentsdonesimultaneouslyBeamPolarizationCalibration15+10-1+1/2-1/2-1/2+1/2mIPThePolarizedTarget-PrinciplerHH2aacceptanceanglea+10-1+1/2-1/216......andPractice

Cooleddissociatornozzletoreducevandv-spread.recombination:dissociationdependsongasflowandnozzletempBeamattenuation:restgasandintrabeamscatteringMagnetdesign(taper,lengths,z-position)needs:velocitydistribution,dissociatorHoutputvsgasflow,nozzleTbeamforminggeometrydifferentialpumpingOPTIMIZATION:COMPUTERMODELLINGrare-earthperm.magnets,poletip1.5T,maxd|B|/dr=6T/cm)overalldesign:TomWise,UWrHH2a......andPracticeCoole1724sectorsseparatingmagnetswith1.5Tfieldatthepoletips.APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019H-jetsextupoleseparationmagnetsystem.00.5m1m1.5mp-beam24sectorsseparatingAPS-DNP18separationmagnets(sextupoles)H2dissociatorPolarimeterfocusingmagnets(sextupoles)RFtransitionsholdingfieldmagnet1.2kGrecoilChamberSiliconDet.(1),(2)Pz+:(1),(4)(transition(2)(4))Pz-:(2),(3)(tranistion(1)(3))Hyperfinestate(1),(2),(3),(4)ThePolarizedH-jetatRHIC

Beamintensity:(1.2±0.2)1017H/sseparationH2dissociatorPolari19NuclearpolarizationofH-atomsEfficiencyofRFtransitions:(99.7±0.2)%

idealprotonpolarizationforB=1.2kG:P=0.960plus~3%dilutionfromH2

P=0.924±2%bunch-fielddepolarization<0.1%APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019NuclearpolarizationofH-ato20ScatteringChamber(topview)H-jetprofileAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019Targetthickness:(1.3±0.2)x1012H/cm280cmPRECOILH-JETScatteringChamber(topview)H21Recoildetectors(bluebeam):6detectors70x64mm16strips(5mradeach)

MeasureEnergy:1~7MeVresolution<50keVTOF:16~80nsresolution<2nsAngle:10~100mrad(89.5-84O)resolution5mradBHjetRecoilDetectorsAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019RHICbeamRecoildetectors(bluebeam):22TimeofflightCNIpeakAN

1<E

<2MeVRecoilprotonselasticpp`01234

5MeVRecoilenergyvs.time-of-flight0sourcecalibrationTimeofflightCNIpeakANR23

Strip#116TRMeV241AmTOF<+/-8nsTOFvsTRSidetectoroffirst8channelsTRTOFanalysisRecoilenergystripbystrip241AmIdentifyingrecoilprotonsvsrecoilangle(=strip#)

Strip#116TRMeV241AmTOF<+24

ppelastic100GeV/c

FNALE704200GeV/cnohadronicspin-flipdatatoanalyzeppAnalyzingPower100GeV/cANvs.momentumtransferppelastic100GeV/cnohadr25Polarizationof100GeVBeam

studysystematicerrorsandimprovestatisticsforabsolutecalibrationaccuracy±5%analyzewidert-rangetostudyppinteractionbunchfielddepolarizationwith110bunchesimprovedmeasurementofH2

contaminationofH-beammeasurebeampolarizationatinjectionmeasureblueandyellowbeampolarizationPlans:~106ppeventsPolarizationof100GeVBeam26Wisconsin:,T.Wise,M.Chapman,W.H.BNL:A.Bravar,G.Bunce,R.Gill,Z.Li,A.Khodinov,A.Kponou,Y.Makdisi,W.Meng,A.Nass,S.Rescia,A.ZelenskiKyoto:H.Okada,N.SaitoITEP-Moscow:I.Alekseev,D.SviridaIUCF:E.StephensonRIKEN-BNL:O.Jinnouchi,RikkyoU:K.KuritaANL:H.SpinkaH-Jetcollaborators:Wisconsin:,T.Wise,M.Chapma27DA1-First-Experiments-with-a-Polarized-Hydrogen-Jet-：DA1第一次实验极化氢射流课件281.26km1.26km29DA1-First-Experiments-with-a-Polarized-Hydrogen-Jet-：DA1第一次实验极化氢射流课件30DA1-First-Experiments-with-a-Polarized-Hydrogen-Jet-：DA1第一次实验极化氢射流课件31nohadronicspin-flipppelastic100GeV/cFNALE704200GeV/cdatatoanalyzeRecoilangle89.5oRecoilenergy0.53MeV5.3MeVppAnalyzingPower100GeV/cANvs.momentumtransfernohadronicspin-flipppela32PlansPlans:improvestatistics,studysystematicerrorsforabsolutecalibrationaccuracy±5%analyzewidert-rangetostudyppinteractionbunchfielddepolarizationwith110bunchesimprovedmeasurementofH2

contaminationofH-beammeasurebeampolarizationatinjectionmeasureblueandyellowbeampolarizationAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019PlansPlans:APS-DNP33RHICppacceleratorcomplexBRAHMS&PP2PP(p)STAR(p)PHENIX(p)AGSLINACBOOSTERPol.ProtonSource500mA,300msSpinRotatorsPartialSiberianSnakeSiberianSnakes200MeVPolarimeterAGSInternalPolarimeterRfDipolesp-CPolarimetersAbsolutePolarimeter(Hjet)0.71011tons/bunch56bunchesAGSpCPolarimetersStrongAGSSnake+-+-+-++--++L=4x1030s-1cm-2,Pbeam~40%BRAHMS&PP2PP(p)STAR(p)PHEN34RHICexperimentswillmeasureDGBUTHOWDOESONEKNOWPbeam?Collidingpolarizedprotonscoupledirectlytogluons(ratherthanviacharge)-measurepartonasymmetries.

Measurepolarizationofgluonsthroughg,jets,ppi’s,heavyquarks.

G.BunceDUBNA-SPIN-03RHICexperimentswillmeasure35

HERMES

internaltargetPurepolarisedgastargets:H,D,targetpolarisation:pT85%

Luminosity:6*1033cm-2s-1(D50mA)

spinreversalevery120secFactor100gainfromuseofstoragecellHERMESinternaltargetPurepo36TheData(asample)numberofevents(a.u.)ReconstructedMissingMass2FWHM~0.1GeV2SimulationMM2FWHM~0.1GeV2InelasticThresholdGeV2TheData(asample)numberofe37

u+d+s0,200,04..QCDanalysisofQ2dependence:K.RithDIS2019DISofpolarizedHEleptonsfrompolarizednucleonsatSLAC,CERN,HERA:The(old)protonspinpuzzle:Only~20%ofprotonspinisaccountedforbyspinsofquarksandantiquarksTwoexperimentalmethods:thicksolidpolarizedtarget+lowintensityeormbeamThinpolarizedgastarget+highintensitybeamWhataccountsforthespinofthenucleon?

APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019u+d+s0,200,04..QC38preliminaryNon-hadronspinflip(Rer5=-0.02)(Rer5=+0.02)Comparisonwithsomemodels(NotFitting)preliminaryNon-hadronspinfli39Demonstratedfeasibilityofaccuratebeampolarizationcalibrationathighenergycalibrationofp-CpolarimetermeasurementofppAN(8angles,±~10%)H-jetdoesnotinterferewithp-beamlifetime3%measurementrequires<200hrswithimprovedbeamintensitymethodcoversentireenergyrangeofRHIC

oneimportantsteptowardsaprecisedeterminationofDG……

CONCLUSIONS:Demonstratedfeasibilityofa40SolenoidalfieldAxialFieldSTARRHICexperimentswillmeasureDGBUTHOWDOESONEKNOWPbeam?PHENIXSolenoidalfieldAxialFieldSTA41DA1-First-Experiments-with-a-Polarized-Hydrogen-Jet-：DA1第一次实验极化氢射流课件42Polarizationof100GeVBeamPlans:analyzewidert-rangetostudyppintercactionimprovestatisticsbunchfielddepolarizationwith110bunchesimprovedmeasurementofH2

contaminationofH-beammeasurebeampolarizationatinjectionmeasureblueandyellowbeampolarizationEventualgoalofcalibration:±3%APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019Polarizationof100GeVBeam43ForwardscatteringparticleID;

CorrelationofEnergyandpositionStrip#116TRMeV241AmTOF<+/-8nsTOFvsTRSidetectorof16channels#1#16#4TRTOFanalysisForwardscatteringparticleID44H+10-1+1/2-1/2-1/2+1/2mIPThePolarizedTarget-PrincipleH2raacceptanceanglearHH2H+10-1+1/2-1/45HThePolarizedTarget-PrincipleH2raacceptanceanglearHH2HThePolarizedTarget-Princi46

Sextupoles:rare-earthpermanentmagnets(gradientupto6T/cm)Magnetgeometry:2magnetgroupsreducechromaticaberrationsmagnetgapsreducegasattenuationtaperincreasesacceptanceRFtransitionsofhighefficiencyveryuniformguidefieldtoavoidbunchfielddepolarizationFieldshapingforadiabatictransportresponsiblefordesign:T.WiseUWH-JetDesignFeaturesAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019permanentmagnetsextupolepoletipfield1.5TSextupoles:rare-earthperman4724sectorsseparatingmagnetswith1.5Tfieldatthepoletips.APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019H-jetsextupoleseparationmagnetsystem.00.5m1m1.5mp-beam24sectorsseparatingAPS-DNP48+10-1+1/2-1/2-1/2+1/2mIPThePolarizedTarget-PrinciplerHH2aacceptanceanglea+10-1+1/2-1/249rHH2H+10-1+1/2-1/2-1/2+1/2mIPThePolarizedTarget-PrincipleH2raacceptanceangleaacceptanceanglearHH2H+10-1+1/250

Sextupoles:rare-earthpermanentmagnets(gradientupto6T/cm)Magnetgeometry:2magnetgroupsreducechromaticaberrationsmagnetgapsreducegasattenuationtaperincreasesacceptanceRFtransitionsofhighefficiencyveryuniformguidefieldtoavoidbunchfielddepolarizationFieldshapingforadiabatictransportresponsiblefordesign:T.WiseUWH-JetDesignFeaturesAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019permanentmagnetsextupolepoletipfield1.5TSextupoles:rare-earthperman51谢谢你的阅读知识就是财富丰富你的人生谢谢你的阅读知识就是财富52DA1-First-Experiments-with-a-Polarized-Hydrogen-Jet-：DA1第一次实验极化氢射流课件53projectortestAPS-DNP2019SessionDA:ProbingtheGluonicandQuarkStructureofMatterprojectortestAPS-DNP2019Ses54DA1.FirstExperimentswitha

PolarizedHydrogenJetTargetinRHIC

WillyHaeberliDepartmentofPhysics,UniversityofWisconsin-Madison

DAProbingtheGluonicandQuarkStructureofMatterMeasuringthePolarizationofHigh-EnergyProtonsWHY?HOW?

APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019DA1.FirstExperimentswitha55

K.RithDIS2019DISofpolarizedHEleptons(e,m)

frompolarizednucleonsatSLAC,CERN,HERA:Goodagreementwithtwoverydifferentexperimentalmethods……….Whataccountsforthespinofthenucleon?

APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019The(old)protonspinpuzzle:Only~(20±4)%ofprotonspinisaccountedforbyspinsofquarksandantiquarksK.RithDIS2019DISofpolar56

two60cmlongTarget-Containerswithoppositepolarization

superconductive

Solenoid(2.5T)3He–4HeDilutionrefrigerator(T~50mK)Dipole(0.5T)COMPASS

polarizedLiDtargetE=160GeV,pB

-76%1.8*107

/sec(timeave)polarizedLiD-target,pT

50%Luminosity:5*1032cm-2s-1Polarization:~50%Dilution40%two60cmlongTarget-Contai57

HERMES

internaltargetFactor100gainfromuseof“storagecell”(S.Price)PolarizedH,Dinjection

ToH,Dpolarimeter

...Purepolarisedgastargets:H,D,targetpolarisation:pT85%targetthickness1014H/cm2Luminosity:6*1033cm-2s-1(D50mA)

spinreversalevery120secHERMESinternaltargetFactor580.1Gluon?Orbital?Gluons:keycontributortotheprotonspin?slideadaptedfromW.Vogelsang(BNL)0.1Gluon?Orbital?Glu59Gluons:MeasurementsofDG/GxgAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019fromF.H.Heinsius,COMPASSCollab-DISApril2019PHENIXandSTARatRHICwillmeasure

DGbycollisionsoflongitudinallypolarizedHEprotons-ALLRHIC:c.m.energiesupto500GeV

Gluons:MeasurementsofDG/Gxg60RHICexperimentswillmeasureDGBUTHOWDOESONEKNOWPbeam?Collidingpolarizedprotonscoupledirectlytogluons(ratherthanviacharge)-measurepartonasymmetries.

Measurepolarizationofgluonsthroughg,jets,ppi’s,heavyquarks.

G.BunceDUBNA-SPIN-03RHICexperimentswillmeasure61TheRHICComplex

50<

Ös

<500GeV

STARPHENIX

SpinRotators20%SnakePHOBOS

SiberianSnakes

presentperformance:L=4x1030s-1cm-2,Pbeam~40%5%Stons/bunch56bunchesBRAHMS&PP2PPAGSLINACBOOSTERPol.ProtonSourceSiberianSnakes200MeVpolarimeterRfDipolesAGSp-CpolarimeterRHICp-Cpolarimetersabsolutepppolarimeter+-+-+-++--++RHICTheRHICComplex50<Ös<50062

WhatmechanismissensitivetoPathighenergy?

NeedtoknowanalyzingpowerA.

MeasuringpolarizationofprotonbeamReversePtoeliminateinstrumentalasymmetryAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019Whatmechanismissensitivet63MagneticMomentScatteringMott(1929),J.Schwinger(Phys.Rev.73,1948)+mmAnalyzingpowerinsmall-angleneutronscattering…..“Itisthepurposeofthisnotetosuggestasecondmechanismforpolarizingfastneutrons-thespin-orbitinteractionarisingformthemotionoftheneutronmagneticmomentintheinthenuclearCoulombfield.”APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019Spin-orbitcoupling:MagneticMomentScatteringMott64APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019Coulomb-nuclearinterference(“CNI”)

Phil.Mag.1,175(1956)1010%sPU(n,n)U100MeVAPS-DNPW.65FNALE704200GeV/cPhys.Rev.D48,3026(1993)ANvsmomentumtransferPolarizedprotonsfromHyperondecay(lowrate)CNIAnalyzingPowerinHigh-EnergyppScattering

FNALE704200GeV/cANv66E950BNLp=21.7GeV/cPhys.Rev.Lett.89(2019)withhadronicspin-flipnohadronicspin-flipmomentumtransfer[(GeV/c)2]CNIAnalyzingPowerp-CarbonScatteringcalibrationonlyat22GeV/csmallANScaleuncertainty~30%UnknownenergydependenceButlargecountratesneedforaccurateabsoluteANmeasurementE950BNLwithhadronicnohadroni67BeamPolarizationCalibrationMeasureasymmetryetgtwhenunpolarizedbeamisscatteredfrompolarizedtargetofKNOWNpolarizationPt-measuresAMeasureasymmetryebeam

whenpolarizedbeamisscatteredfromunpolarizedtargetElasticscatteringofIDENTICALparticles(pp):beamanalyzingpower=targetanalyzingpower(Changeinreferenceframe)

APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019BothexperimentsdonesimultaneouslyBeamPolarizationCalibration68+10-1+1/2-1/2-1/2+1/2mIPThePolarizedTarget-PrinciplerHH2aacceptanceanglea+10-1+1/2-1/269......andPractice

Cooleddissociatornozzletoreducevandv-spread.recombination:dissociationdependsongasflowandnozzletempBeamattenuation:restgasandintrabeamscatteringMagnetdesign(taper,lengths,z-position)needs:velocitydistribution,dissociatorHoutputvsgasflow,nozzleTbeamforminggeometrydifferentialpumpingOPTIMIZATION:COMPUTERMODELLINGrare-earthperm.magnets,poletip1.5T,maxd|B|/dr=6T/cm)overalldesign:TomWise,UWrHH2a......andPracticeCoole7024sectorsseparatingmagnetswith1.5Tfieldatthepoletips.APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019H-jetsextupoleseparationmagnetsystem.00.5m1m1.5mp-beam24sectorsseparatingAPS-DNP71separationmagnets(sextupoles)H2dissociatorPolarimeterfocusingmagnets(sextupoles)RFtransitionsholdingfieldmagnet1.2kGrecoilChamberSiliconDet.(1),(2)Pz+:(1),(4)(transition(2)(4))Pz-:(2),(3)(tranistion(1)(3))Hyperfinestate(1),(2),(3),(4)ThePolarizedH-jetatRHIC

Beamintensity:(1.2±0.2)1017H/sseparationH2dissociatorPolari72NuclearpolarizationofH-atomsEfficiencyofRFtransitions:(99.7±0.2)%

idealprotonpolarizationforB=1.2kG:P=0.960plus~3%dilutionfromH2

P=0.924±2%bunch-fielddepolarization<0.1%APS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019NuclearpolarizationofH-ato73ScatteringChamber(topview)H-jetprofileAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019Targetthickness:(1.3±0.2)x1012H/cm280cmPRECOILH-JETScatteringChamber(topview)H74Recoildetectors(bluebeam):6detectors70x64mm16strips(5mradeach)

MeasureEnergy:1~7MeVresolution<50keVTOF:16~80nsresolution<2nsAngle:10~100mrad(89.5-84O)resolution5mradBHjetRecoilDetectorsAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019RHICbeamRecoildetectors(bluebeam):75TimeofflightCNIpeakAN

1<E

<2MeVRecoilprotonselasticpp`01234

5MeVRecoilenergyvs.time-of-flight0sourcecalibrationTimeofflightCNIpeakANR76

Strip#116TRMeV241AmTOF<+/-8nsTOFvsTRSidetectoroffirst8channelsTRTOFanalysisRecoilenergystripbystrip241AmIdentifyingrecoilprotonsvsrecoilangle(=strip#)

Strip#116TRMeV241AmTOF<+77

ppelastic100GeV/c

FNALE704200GeV/cnohadronicspin-flipdatatoanalyzeppAnalyzingPower100GeV/cANvs.momentumtransferppelastic100GeV/cnohadr78Polarizationof100GeVBeam

studysystematicerrorsandimprovestatisticsforabsolutecalibrationaccuracy±5%analyzewidert-rangetostudyppinteractionbunchfielddepolarizationwith110bunchesimprovedmeasurementofH2

contaminationofH-beammeasurebeampolarizationatinjectionmeasureblueandyellowbeampolarizationPlans:~106ppeventsPolarizationof100GeVBeam79Wisconsin:,T.Wise,M.Chapman,W.H.BNL:A.Bravar,G.Bunce,R.Gill,Z.Li,A.Khodinov,A.Kponou,Y.Makdisi,W.Meng,A.Nass,S.Rescia,A.ZelenskiKyoto:H.Okada,N.SaitoITEP-Moscow:I.Alekseev,D.SviridaIUCF:E.StephensonRIKEN-BNL:O.Jinnouchi,RikkyoU:K.KuritaANL:H.SpinkaH-Jetcollaborators:Wisconsin:,T.Wise,M.Chapma80DA1-First-Experiments-with-a-Polarized-Hydrogen-Jet-：DA1第一次实验极化氢射流课件811.26km1.26km82DA1-First-Experiments-with-a-Polarized-Hydrogen-Jet-：DA1第一次实验极化氢射流课件83DA1-First-Experiments-with-a-Polarized-Hydrogen-Jet-：DA1第一次实验极化氢射流课件84nohadronicspin-flipppelastic100GeV/cFNALE704200GeV/cdatatoanalyzeRecoilangle89.5oRecoilenergy0.53MeV5.3MeVppAnalyzingPower100GeV/cANvs.momentumtransfernohadronicspin-flipppela85PlansPlans:improvestatistics,studysystematicerrorsforabsolutecalibrationaccuracy±5%analyzewidert-rangetostudyppinteractionbunchfielddepolarizationwith110bunchesimprovedmeasurementofH2

contaminationofH-beammeasurebeampolarizationatinjectionmeasureblueandyellowbeampolarizationAPS-DNPW.Haeberli,UniversityofWisconsinChicagoOctober29,2019PlansPlans:APS-DNP86RHICppacceleratorcomplexBRAHMS&PP2PP(p)STAR(p)PHENIX(p)AGSLINACBOOSTERPol.ProtonSource500mA,300msSpinRotatorsPartialSiberianSnakeSiberianSnakes200MeVPolarimeterAGSInternalPolarimeterRfDipolesp-CPolarimetersAbsolutePolarimeter(Hjet)0.71011tons/bunch56bunchesAGSpCPolarimetersStrongAGSSnake+-+-+-++--++L=4x1030s-1cm-2,Pbeam~40%BRAHMS&PP2PP(p)STAR(p)PHEN87RHICexperimentswillmeasureDGBUTHOWDOESONEKNOWPbeam?Collidingpolarizedprotonscoupledirectlytogluons(ratherthanviacharge)-measurepartonasymmetries.

Measurepolarizationofgluonsthroughg,jets,ppi’s,heavyquarks.

G.BunceDUBNA-SPIN-03RHICexperimentswillmeasure88

HERMES

internaltargetPurepolarisedgastargets:H,D,targetpolarisation:pT85%

Luminosity:6*1033cm-2s-1(D50mA)

spinreversalevery120secFactor100gainfromuseofstoragecellHERMESinternaltargetPurepo89TheData(asample)numberofevents(a.u.)ReconstructedMissingMass2FWHM~0.1GeV2SimulationMM2FWHM~0.1GeV2