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RHIC Polarimetery

RHIC Polarimetery. A.Bazilevsky for RHIC Polarimetry group RHIC Spin Collaboration Metting May 1 (Friday), 2009. pC: s=2 00 GeV run. The same setup as in the end of s=500 GeV run Energy Calibration Energy and ToF corrections Targets The same measurement strategy

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RHIC Polarimetery

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  1. RHIC Polarimetery A.Bazilevsky for RHIC Polarimetry group RHIC Spin Collaboration Metting May 1 (Friday), 2009

  2. pC: s=200 GeV run • The same setup as in the end of s=500 GeV run • Energy Calibration • Energy and ToF corrections • Targets • The same measurement strategy • Run all 4 polarimeters simultaneously (vertical and horizontal scans for each beam) • Monitor the system (excluding detectors) during measurements with generator pulses • So far no major issues

  3. pC Rate history s=200 GeV Smooth, no change

  4. pC measurements Online Polarization (%), not normalized (!) vs fill Fills 10616 (Apr 18) – 10682 (Apr 30) “Online” polarizations: 0.50-0.60 “Quite” consistent (relative) behavior of Pol-1 vs Pol-2 Pol-1 measure slightly lower than Pol-2: by ~5%

  5. pC-BluevsHJet Hjet/pC is stable over fills within (large) stat. errors (of HJet) HJet: <P>=54% (fills 10616-10668) HJet/Blue1  1.03 HJet/Blue2  0.97

  6. pC-Yellow vs HJet Hjet/pC is stable over fills within (large) stat. errors (of HJet) HJet: <P>=56% (fills 10616-10646) HJet/Yell1  1.05 HJet/Yell2  1.01

  7. More precise Hjet-pC comparison Hjet: fills combined in 3 periods Drop in polarization confirmed by Hjet in both blue and yellow pC-blue HJet pC-yellow HJet

  8. Pol. Profile Polarimeters 2 Polarimeters 1 Horizontal profile Vertical profile Vertical profile Horizontal profile Usual… R0.15 in previous years (100 GeV beams) R0.1  Experiments see 5% more polarization than Hjet

  9. Spin Horizontal Component s=200 GeV Horiz. Component: 0.065 (of ~0.55)  ~7 degrees 0.035 (of ~0.55)  ~3.5 degrees Consistent between Pol-1 and Pol-2

  10. Spin Horizontal Component s=500 GeV No spin horizontal component with 250 GeV beams

  11. Backups

  12. Rate history s=500 GeV

  13. C Mass

  14. P 2. Obtain R directly from the P(I) fit:    I R=0.290.07 pC: Polarization Profile Scan C target over the beam cross: pC 1. Directly measure I and P : P Polarization I Intensity Target Position Precise target positioning is NOT necessary

  15. pC Monitoring ToF Generator pulses Carbon Ekin

  16. pC monitoring Low rate example: 10429.013 High rate example: 10346.007 Event rate vs time Pulse rate vs time Pulse amplitude vs time Pulse ToF vs time

  17. AN vs energy Ebeam = 100 GeV Any shift in energy measurements lead to a shift in AN (asymmetry)

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