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RUN8 H-Jet polarimeter

RUN8 H-Jet polarimeter. Hiromi Okada April 4 th. ONLINE Data check. Two correlations (T R -TOF,  R -T R ), Background level, acceptance, A N &  BEAM. ONLINE results of single beam mode. Absolute beam-pol. for every couple of stores! All stuffs are on the web.

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RUN8 H-Jet polarimeter

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  1. RUN8 H-Jet polarimeter Hiromi Okada April 4th • ONLINE Data check. • Two correlations (TR-TOF, R-TR), • Background level, acceptance, • AN & BEAM. • ONLINE results of single beam mode. • Absolute beam-pol. for every couple of stores! • All stuffs are on the web. • Two beams mode commissioning. • Next things for the OFFLINE analysis.

  2. Single beam mode Set up 3 2 1 6 5 4 Ch#16 Ch#1 Same as RUN5 and RUN6 y x (0, -4) mm Collision point – detector: 80cm Cover kinetic energy: 0.5 < TR < 5 MeV Energy calibration: 5.486 MeV (Am), 3,183 MeV (Gd) (-10, -10) mm jet

  3. Energy and TOF correlations from one of the detector 0.5 < TR < 5 MeV 80 > TOF > 20 ns Ch#4 Ch#1 TOF TR Ch#8 Ch#5 Ch#9 Ch#16

  4. Energy and TOF correlations of 6 detectors (BLUE side) Si#6 Si#3 TOF TR 0.5 < TR < 5 MeV 80 > TOF > 20 ns Si#5 Si#2 Color shows events from 8 different channels. TOF TR Si#1 Si#1 Recoil particle identification 20 nsec

  5. B Si#4 Si#3 TR and ch# correlation TR Y Ch# Si#5 Si#2 Ch#  R Forward scattered particle identification Si#6 Si#1

  6. Background level single beam mode 1.2 <TR <2.5 MeV, 2 hours data BLUE mode 200 YELLOW mode BPM at IR12 reading: Blue (x,y)= (0, 4)mm Yellow (x,y) = (10, +10)mm, Fill#9905 BPM at IR12 reading: Blue (x,y)= (+5, +8)mm Yellow (x,y) = (0, 4)mm, Fill#9920

  7. ONLINE results of single beam mode • Absolute beam-pol. for every couple of stores! Sasha will show… • All stuffs are available on the web. http://www.phenix.bnl.gov/WWW/publish/shura/RSC/2008/ I am going to talk about brief update of two beams mode commissioning.

  8. Two beams mode Y B Si4 TR Ch# March 8-10, 20hours TR vs. R

  9. Event distribution of two beam mode 1.2 < TR < 2.5 MeV Background level between blue and yellow do not differ!! y +10 -10 x (0, -1) mm (0, -7) mm jet But, Si4 yellow side… Two beams MODE

  10. Two beams MODE Blue beam down 0.5mm does help! 1.2 <TR <2.5 MeV, 2 hours data y (+10, -10) mm +10 -10 x (0, -1.5) mm (0, -7) mm jet 200 Background level seems to be similar..? Now, Si4 is better

  11. March 8-10, 20hours 2/ndf = 14.2/6 2/ndf = 2.4/6 Need more time for feasibility estimation of two beams mode! 1.0M events, 0.426  0.026 1.1M events, 0.452  0.025

  12. Next things… • Offline analysis • Time0 estimation to apply tighter TOF-width cut, • Background level estimation, • Acceptance study, • More study of intensity profile of the H-Jet target, • Check “polarization profile” of the H-Jet target using “off-center” data. • Finalize results. Do my best for the offline analysis!

  13. ADC vs. TDC Si1 Two beams mode

  14. Two beams mode statistics Yellow position down 0.5mm

  15. The Jet Running With Two Beams On Axis • Dx= * + s2/ * = 20m vs. 10 m Separation at IP is smaller by 1/2 BPM 5.5mm >> 3.88 mm Not bad !! BPM data Y= -1.5, B= -7 mm No beam decay or adverse backgrounds observed Yousef’s RHIC-retreat slide

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