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experiment at RHIC, part 1 Achim Franz

First Results from the. experiment at RHIC, part 1 Achim Franz. Where is RHIC. R elativistic H eavy I on C ollider located at B rookhaven N ational L aboratory Long Island, New York. Goals of the R elativistic H eavy I on C ollider.

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experiment at RHIC, part 1 Achim Franz

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  1. First Results from the experiment at RHIC, part 1 Achim Franz

  2. Where is RHIC RelativisticHeavyIonCollider located at BrookhavenNationalLaboratory Long Island, New York Achim Franz, BNL, PHENIX

  3. Goals of the Relativistic Heavy Ion Collider Search for and study of quark gluon plasma in relativistic heavy ion collisions @ s = 200 A GeV/c. • Study of spin physics in polarized p - p interactions • @ 50 s  500 GeV/c. Achim Franz, BNL, PHENIX

  4. The Quark Gluon Plasma, a phase transition Achim Franz, BNL, PHENIX

  5. Where is PHENIX Achim Franz, BNL, PHENIX

  6. Collaboration Brazil: Sao Paolo Canada: McGill China: Academia Sinica, CIAE France: SUBATECH Germany: Münster India: BARC, Banaras Hindu University Israel: Weizmann Institute Japan: CNS, Hiroshima, KEK, Kyoto, Nagasaki, RIKEN, TITech., Tokyo, Tsukuba, Waseda Korea: Korea, Myongji, Yonsei Russia: IHEP Protvino, JINR Dubna, Kurchatov, PNPI, St. Petersburg STU Sweden: Lund U.S. National Labs: BNL, LANL, LLNL, ORNL U.S. Universities: Abilene Christian, Alabama-Huntsville, California-Riverside, Columbia, Florida State, Georgia State, Iowa State, New Mexico, New Mexico State, SUNY-Stony Book, Tennessee, Vanderbilt Achim Franz, BNL, PHENIX

  7. Collaboration Dec. 99 me Achim Franz, BNL, PHENIX

  8. What is PHENIX P ioneering H igh E nergy N uclear I on e X periment Search for and study of quark gluon plasma in relativistic heavy ion collisions @ s = 200 A GeV/c. • Focus on lepton and photon signatures to probe early time in collision (but some hadrons signatures too) • High rate, sophisticated triggers  rare and high pT processes • Study of spin physics in polarized p - p interactions • @ 50 s  500 GeV/c. • Spin of the proton; structure functions (e.g., G) • Parity violating asymmetries (e.g., in W production) as a probe of new physics Achim Franz, BNL, PHENIX

  9. What does PHENIX do MC Achim Franz, BNL, PHENIX

  10. What does PHENIX do • A polarized hadron collider is uniquely suited to some spin measurements: • DG (gluon fraction of proton spin) via • Direct photons • High pT pions • J/Y production • (sea-quark fraction of proton spin) via • W+/W- production • Polarized Drell-Yan • RHIC has been equipped • To provide polarized beams of protons • To make spin measurements of same in PHENIX, STAR and specialized experiments like pp2pp. Achim Franz, BNL, PHENIX

  11. Successful Spin commissioning • Injection with Spin Flipped : Asymmetry Flipped • Adiabatically Snake on: horizontal polarization • Accelerate equivalent to 180o rotation: 180o rotated Single Snake Operation Achim Franz, BNL, PHENIX

  12. What is PHENIX • 3 magnet • 3 “global” detectors • 2 “forward” spectrometers • 2 “central” spectrometers Achim Franz, BNL, PHENIX

  13. Detectors installed/active this year BB Beam Beam Counter MVD Multiplicity Vertex Detector DC Drift Chamber PCx Pad Chambers RICH Ring Image Cherenkov counter TEC Time Expansion Chamber TOF Time Of Flight detector PbSc Lead-Scintillator Cal. PbGl Lead-Glas Calorimeter Central magnet: ~9m high, 500t ∫ B dl = 0.78Tm @ 90° Achim Franz, BNL, PHENIX

  14. Detectors installed this year Achim Franz, BNL, PHENIX

  15. History 08.08.96 Achim Franz, BNL, PHENIX

  16. History 02.20.98 Achim Franz, BNL, PHENIX

  17. History 01.29.99 Achim Franz, BNL, PHENIX

  18. History 06.30.99 Achim Franz, BNL, PHENIX

  19. History 11.30.99 Achim Franz, BNL, PHENIX

  20. History 03.21.00 Achim Franz, BNL, PHENIX

  21. History 09.05.00 Achim Franz, BNL, PHENIX

  22. History 10.25.00 Achim Franz, BNL, PHENIX

  23. How to Characterize a Collision Achim Franz, BNL, PHENIX

  24. IR Achim Franz, BNL, PHENIX

  25. Zero Degree Calorimeter Single neutron peak Coincidence with BBC • Common to all experiments (Luminosity) • measure neutral energy within a 2 mrad cone about the beam direction, centrality trigger Achim Franz, BNL, PHENIX

  26. Beam Beam Counter BBC Vertex resolution • 2x64 Quartz Cherenkov counter wrapped around the beam pipe • start timing (40ps), vertex location • multiplicity Achim Franz, BNL, PHENIX

  27. Trigger Both the ZDC and BBC are used to make a decision if a collision has occurred, plus event type selection, all in a few hundred ns. Achim Franz, BNL, PHENIX

  28. DataAQuisition Achim Franz, BNL, PHENIX

  29. First Event Achim Franz, BNL, PHENIX

  30. Data • RHIC machine studies and experiment commissioning: March thru June • First collisions: June 15, 2000 at about half beam energy • Initial operation (June) with 6+6 bunches yielded 500,000 PHENIX collisions. • Final operation (July-September) with 55+55 bunches yielded nearly 45,000,000 PHENIX collisions! • About five million events were put on tape, ~ 3TB of data ! Achim Franz, BNL, PHENIX

  31. Correlations PC3 (east) vs PC1 (east) PC1 (east) vs DC nTOF vs PC1 (east) Achim Franz, BNL, PHENIX

  32. PID with tracking and RICH Detail of South-West Side Central arm, side view Achim Franz, BNL, PHENIX

  33. TOF Particle Identification Note: * No slewing correction * Applied track association cut : dr = 5 cm * No acceptance/efficiency/decay corrections Achim Franz, BNL, PHENIX

  34. So far for the first part;continue with John. G. LajoieIowa State University Achim Franz, BNL, PHENIX

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