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PHENIX Status and Physics Impact Overview

Learn about the PHENIX Collaboration at Columbia University, its schedule, status, physics impact, and the role of spin. Discover the goals of studying nuclear matter under extreme conditions, and the achievements and implications of the Run-1 results.

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PHENIX Status and Physics Impact Overview

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  1. PHENIX STATUS W.A. Zajc Columbia University for the PHENIX Collaboration

  2. Outline • Collaboration • Schedule • Status • Physics Impact to date • Role of Spin in PHENIX

  3. What is PHENIX? • Pioneering High Energy Nuclear Interaction eXperiment • Goals: • Broadest possible study of A-A, p-A, p-p collisions to • Study nuclear matter under extreme conditions • Using a wide variety of probes sensitive to all timescales • Study systematic variations with species and energy • Measure spin structure of the nucleon • These two programs have produced a detector with unparalleled capabilities

  4. The PHENIX Collaboration A strongly international venture: • 11 nations Brazil, China, France, Germany, India, Israel, Japan, South Korea, Russia, Sweden, United States • 51 institutions

  5. Schedule • 2 central spectrometers 1999 • 2 forward spectrometers 2001 2000 • 3 global detectors 2002

  6. 24-Jul-97

  7. 10-Jan-98

  8. 12-Jan-99

  9. 23-Dec-99

  10. One Year Ago For years we’d been showing pictures of one “central” arm: 21-Jan-00: The real thing moves into place

  11. Run-1 Configuration • Two central arms • Mechanically ~complete • Roughly half of aperture instrumented • Global detectors • Zero-degree Calorimeters (ZDCs) • Beam-Beam Counters (BBCs) • Multiplicity and Vertex Detector (MVD, engineering run)

  12. Run-1 Accomplishments • First collisions:15-Jun-00 • Last collisions: 04-Sep-00 • During this period: • Commissioned • Zero-Degree Calorimeters • Beam-Beam Counters • Multiplicity and Vertex Counter • Drift Chambers • Pad Chambers • Ring Imaging Cerenkov Counter • Time Expansion Chamber • Time-of-Flight Counters • Electromagnetic Calorimeter • Muon Identifier • Minimum Bias Triggers • Data Acquisition System • Recorded ~5M minimum bias events

  13. Run-1 Results All results are for Au-Au collisions at • Global Event Features • Transverse Energy • Charged Multiplicity • Elliptic Flow • Identified Particles • Hadrons • p, K , p  • po’s • p  p HBT • Electrons • Studied versus • Centrality • Number of participants

  14. Run-1 Results This is a partial compilation

  15. Physics Implications (??) Slide from seminar given last week by M. Gyulassy

  16. Physics Impact

  17. Run-1 Summary • PHENIX achieved its goals: • Completion of Year-1 • Mechanics • Electronics • Commissioning of all Year-1 sub-systems • Unbiased sample of RHIC events • Major physics impact while maintaining progress towards a Run-2 spin measurement: • Spin commissioning of one ring • Construction of South Muon Spectrometer • These successes would have been impossible without the RIKEN contributions

  18. RBRC and RIKEN Roles in PHENIX (1) • PHENIX Muon Arm: En’yo, Ichihara, Imai, Kobayashi, Kurita, Mao. Murata, Saito, Sato, Shibata, Taketani, Tojo, Tori, Watanabe • PHENIX EMCal • Analysis of Au-Au Collision Data: Basilevsky, Goto, Tori • High Energy Beam Test: Goto, Imai, Saito, Tori • PHENIX Trigger • EMCal+RICH: Grosse-Perdekamp • LVL-2: Deshpande • PHENIX-CC-J: En’yo, Goto, Hayashi, Ichihara, Watanabe, Yokkaichi • PHENIX Luminosity Monitor: Bunce • PHENIX Drift Chamber: Grosse-Perdekamp

  19. RBRC and RIKEN Roles in PHENIX (2) • PHENIX Calibration Task Force: Matthias • Polarimeter • RHIC Polarimeter: Bunce, Deshpande, Imai, Kurita, Saito, Tojo • AGS Polarimeter (E950/E925): Bunce, En’yo, Goto, Hayashi, Kurita, Saito, Sato • PHENIX Local Polarimeter: Goto, Saito • Future Planning • PHENIX Upgrades: Goto, Taketani • eRHIC: Deshpande • PHENIX “service” • Executive Council: En’yo • Local PHENIX-J Contact: Saito • Internal Review Committee: Grosse-Perdekamp • Speakers’ Bureau: Saito

  20. This year • South Muon Spectrometer now in place • On-schedule for major contributions to • Upcoming spin run AND • Upcoming heavy ion run

  21. Spin in PHENIX • Spin has been an integral part of PHENIX strategy and policy • In statements to BNL management • In all Beam Use Proposals • In the PHENIX Executive Council • The heavy ion program has benefited from this synergy: • In analysis of calorimeter data • In performing our data analysis (CC-J!) • In internal review of our first publications • We look forward with great anticipation to the first spin physics this year. • We look forward to mutually beneficial collaboration throughout the entire RHIC era.

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