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Polarization Measurements of RHIC-pp RUN05 Using CNI pC-Polarimeter

Polarization Measurements of RHIC-pp RUN05 Using CNI pC-Polarimeter. Itaru Nakagawa (RIKEN/RBRC) On behalf of CNI Polarimeter Group

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Polarization Measurements of RHIC-pp RUN05 Using CNI pC-Polarimeter

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  1. Polarization Measurements of RHIC-pp RUN05 Using CNI pC-Polarimeter Itaru Nakagawa (RIKEN/RBRC) On behalf of CNI Polarimeter Group I.G.AlekseevA A.BravarB G.BunceB S.DhawanD R.GillB H.HuangB W.HaeberliE G.IgoF O.Jinnouchi V.P.KanavetsA K.KuritaH A.KhodinovJ Z.LiB Y.MakdisiB A.NassB W.LozowskiI W.W.MacKayB H.OkadaG S.ResciaB T.RoserB N. SaitoG H.SpinkaL D.N.SviridaA D.UnderwoodL C.WittenF T.WiseI J.WoodF A.ZelenskiB RBRC ITEPA BNLB ANLC Yale UD Wisconsin UE UCLAF Kyoto UG Rikkyo UH Indiana UI StonyBrook UJ IUCFK Argonne UL

  2. Carbon target 90º in Lab frame Recoil carbon Polarized proton Polarimetry: Impact on RHIC-SPIN Single Spin Asymmetries Physics Asymmetries Pbeam Required Accuracy ~5% Double Spin Asymmetries Polarization measurement by Elastic pp/pC

  3. Recoil Carbon pC Analyzing Power AN (100GeV) t-dependence L. Trueman hep-ph/0305085 Need to Measure Recoil Energy

  4. Absolute Polarimeter (H jet) RHIC pC Polarimeters Siberian Snakes BRAHMS & PP2PP (p) RHIC PHENIX (p) STAR (p) Siberian Snakes Spin Rotators Solenoid Snake LINAC BOOSTER Pol. Proton Source 500 mA, 400 ms AGS Warm Snake 200 MeV Polarimeter AC Dipole AGS pC CNI Polarimeter Cold Snake RHIC Polarimetry

  5. Characteristics of pC polarimeter  High Event Rate • Large Cross Section • Solid target • 20 sec./measurement for ~ 2% statistics. • Immediate feedback to accelerator operation • “Bunch by Bunch” beam polarization structure • Polarization profile measurement

  6. Ultra thin Carbon ribbon Target (3.5mg/cm2) 6 1 18cm 2 5 Si strip detectors (TOF, EC) Physics asymmetry 3 4 90 deg Physics 45 deg Physics False asymmetry 6 1 6 1 Cross (Forbidden) Up-Down (Radial) 1 6 6 1 2 5 5 2 5 5 2 2 3 3 4 4 3 3 4 4 pC Polarimeter Setup 2mm pitch 12 strips 10mm 72 strips in total Redundancy  Systematic/Consistency Check  

  7. Strip by Strip Consistency • 2 Distribution of sin() fit • Well Distributed around 1 • Evidence of Consistent Polarization Measurements by individual strips

  8. L Time of Flight tmeas[ns] Carbon Target Tdeposit (keV）) (adc) (DeadLayer) Energy Correction (t0,x)  Kinematic Fit

  9. Energy Correction (Stability) Stability Error 9 ~ 11 g/cm2

  10. Online/Offline Polarization

  11. 2mm 2mm Run5 Polarization Profile Polarization Polarization Count Rate[Hz] Count Rate[Hz]

  12. Uncertainties & Summary Relative Run5 Smaller Smaller

  13. Backup Slides

  14.  angle [deg.] Fill Number Azimuthal Angle Distribution  = 0 deg.  angle [deg.] Fill Number

  15. Energy Correction Kinetic Energy = ４００keV Energy Loss [keV] Observation • Typical Thickness 〜50 g/cm2 Correction

  16. Event Selection Dependence 3 2 2  vs 3  Cut Consistency  Systematic Error

  17. Event Selection Error ~ 1% ( was 3% in Run3,4) Event Selection Error

  18. 6 1 2 5 2mm pitch 12 strips 3 4 Strip by Strip Consistency ~ sin() fit ~

  19. Road Map to Finalize the Analysis • Remaining Major Items • Continue QA (3 weeks) • Suspicious bunch, strips • Study Off-Centered Target Measurements(2 ~ 4weeks) • Fill by Fill Analysis • Polarization Profile • Normalization with Jet (4 weeks)

  20. Energy Correction(g/cm2) Strip Number （７２ Total） Energy Correction (Strip by Strip Consistency) • All Detectors are made from same wafers •  Any inconsistency should be accounted as sys

  21. Energy Correction (Strip by Strip Consistency)

  22. Systematic Error Summary(1) Energy Correction [ug/cm2] ( ):Relative Error

  23. Contents • Kinematics Reconstruction •  source energy calibration • Deadlayer energy correction • Systematic error estimation(1) • Polarization (1st Path Analysis Results) • Online/Offline • Event selection 2/3 • Strip by strip consistency  sin() fit • Systematic error estimation (2)

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