The PHENIX experiment for the RHIC Commissioning Run

The PHENIX experiment for the RHIC Commissioning Run Achim Franz, BNL Session BE 05 - Ultrarelativistic Heavy Ions I. Annual Fall Meeting of the Division of Nuclear Physics October 20 - 23, 1999 Pacific Grove, CA Brookhaven Science Associates U. S. Department of Energy http: //www. phenix. bnl. gov/~afranz/talks/1999 DNP/index. htm 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 1

What is PHENIX? • Pioneering High Energy Nuclear Ion e. Xperiment • An international collaboration of more than 400 scientists and engineers • ~4000 tons of extremely sophisticated detector subsystems • A scientific adventure to – Understand the mystery of proton spin – Understand the densest, hottest matter ever formed on Earth – Search for and characterize new states of matter 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 2

PHENIX, the collaboration Brazil: Canada: China: Germany: India: Israel: Japan: Korea: Russia: Sweden: Taiwan: Sao Paolo Mc. Gill CIAE Münster BARC, Banaras Hindu University Weizmann Institute CNS, Hiroshima, KEK, Kyoto, Nagasaki, RIKEN, TITech. , Tokyo, Tsukuba, Waseda Korea, Myongji, Yonsei IHEP Protvino, JINR Dubna, Kurchatov, PNPI, St. Petersburg STU Lund Academica Sinica U. S. National Labs: BNL, LANL, LLNL, ORNL U. S. Universities: Alabama-Huntsville, California-Riverside, Columbia, Florida State, Georgia State, Iowa State, New Mexico State, SUNYStony Brook, Tennessee, Vanderbilt 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 3

Where is PHENIX? H E R E 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 4

What does PHENIX measure? • Hadrons Final-state “debris” as quark-gluon plasma returns to ordinary matter. • Photons • “Real” g • “Massive” g* (decays to e+e- or m+m- pairs) èThe blackbody radiation from the collision • Vector mesons, especially J/y’s – Look for their disappearance (~ melting) 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 5

PHENIX the detector @ “IP 8” at RHIC(Everywhere that fits): • 2 “global” detectors 10/21/1999 • 2 “forward” spectrometers • 2 “central” spectrometers DNP Meeting 1999, Achim Franz, Achim@bnl. gov 6

Detectors used during the ER ZCal: BB 4 FEM, 8 ch. each DC 6 FEM PC 2 FEM, 2160 ch. each TEC 8 FEM, 64 ch. each EMCal 2 FEM, 144 ch. each TOF 3 FEM, 16 ch. Each RICH 10/21/1999 1 FEM, 8 channels electronic chain test only DNP Meeting 1999, Achim Franz, Achim@bnl. gov 7

In- and out-side the IR. . . EMCal ZCal BB-S RICH BB-N PC/DC CM TEC and TOF 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 8

On-line 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 9

Timeline 16 July 1999 1100 hrs: Closed orbit for Gold beam achieved for the RHIC Blue Ring. 16 July 1999 1400 hrs: Beam Captured by the RHIC RF in the Blue ring. 02 August 1999 0300 hrs: ACCELERATION to the top of the mini-ramp in the BLUE Ring has been achieved. 05 August 1999 Beam life in the RHIC Blue Ring at Injection energy extended to more than 45 minutes. 08 August 1999 1530 hrs: Over 120 complete turns of beam seen in the YELLOW ring. 12 August 1999 RHIC has been declared OPERATIONAL by DOE. 14 August 1999 Beam Captured at injection by the RHIC RF in the YELLOW ring at a frequency 42 Hz (1 mm in radius ) different from the beam in the BLUE Ring. 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 10

Here’s the beam with magnets ramping 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 11

Signals in the ZDC and Beam-Beam Counter PM marked ‘green‘ were operational, ‘red’ indicates a signal above threshold. 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 12

Tracks in the EMCal DAQ was triggered by energy seen in EMCal Top: charge integral (ADC counts) Bottom: Threshold crossing time (TDC counts) 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 13

Highlights of things to come, part 1 PC 3 TOF TEC muon. TR 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 14

Highlights of things to come, part 2 TEC/PC 3 installation, last week DC/PC 1 ready to be installed 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 15

Still outside the wall Watch daily progress @ http: //www. phenix. bnl. gov/ 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 16

Other presentations related to PHENIX [BE. 06] The PHENIX Time Expansion Chamber with the First Beams at RHIC XT NE [BF. 01] The RHIC Spin Program at Phenix !! [BF. 02] High Energy Beam Test of PHENIX EM-Calorimeter at CERN [JD. 02] Inclusive photon spectrum reconstruction in the PHENIX EMCal (standalone) [JG. 09] Zero Degree Calorimeters for RHIC, Results from the Commissioning Run [JD. 03] Gain Tracing for the Large PMT-based Calorimeter System in the PHENIX [JG. 12] Centrality Trigger Algorithms for the PHENIX Detector [JG. 13] PHENIX Online Control System [JG. 14] PHENIX Timing System 10/21/1999 DNP Meeting 1999, Achim Franz, Achim@bnl. gov 17