First Results from the experiment at RHIC, part 1 Achim Franz.
experiment at RHIC, part 1 Achim Franz
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Transcript of experiment at RHIC, part 1 Achim Franz
First Results from the
experiment at RHIC, part 1
Achim Franz
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RelativisticHeavyIonCollider located at Brookhaven National Laboratory
Long Island,
New York
Where is RHIC
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Search for and study of quark gluon plasmaquark gluon plasma in relativistic
heavy ion collisions @ s = 200 A GeV/c.
Study of spin physicsspin physics in polarized p - p interactions
@ 50 s 500 GeV/c.
Goals of the Relativistic Heavy Ion Collider
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The Quark Gluon Plasma, a phase transition
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Where is PHENIX
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Brazil: Sao PaoloCanada: McGillChina: Academia Sinica, CIAEFrance: SUBATECHGermany: MünsterIndia: BARC, Banaras Hindu University Israel: Weizmann InstituteJapan: CNS, Hiroshima, KEK, Kyoto,
Nagasaki, RIKEN, TITech., Tokyo, Tsukuba, Waseda
Korea: Korea, Myongji, YonseiRussia: IHEP Protvino, JINR Dubna,
Kurchatov, PNPI, St. Petersburg STUSweden: Lund
U.S. National Labs: BNL, LANL, LLNL, ORNLU.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
Collaboration
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Collaboration Dec. 99
me
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P P ioneeringioneering
H H igh igh
E E nergy nergy
N N uclear uclear
I I on on
e e X X perimentperiment
Search for and study of quark gluon quark gluon plasmaplasma in relativistic heavy ion collisions @ s = 200 A GeV/c.– Focus on lepton and photon signatureslepton and photon signatures
to probe early time in collision (but some hadrons signatures too)
– High rate, sophisticated triggers rare and high pT processes
What is PHENIX
Study of spin physicsspin 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
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What does PHENIX doMC
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• A polarized hadron collider is uniquely suited to some spin measurements: G (gluon fraction of proton spin) via
• Direct photons• High pT pions• J/ 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.
du ,
What does PHENIX do
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Single Snake Operation
• Injection with Spin Flipped : Asymmetry Flipped
• Adiabatically Snake on: horizontal polarization
• Accelerate equivalent to 180o rotation: 180o rotated
Successful Spin commissioning
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• 3 “global” detectors • 2 “forward”
spectrometers
• 3 magnet
What is PHENIX• 2 “central”
spectrometers
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BB Beam Beam CounterMVD Multiplicity Vertex DetectorDC Drift ChamberPCx Pad ChambersRICH Ring Image Cherenkov counterTEC Time Expansion ChamberTOF Time Of Flight detectorPbSc Lead-Scintillator Cal.PbGl Lead-Glas Calorimeter
Central magnet: ~9m high, 500t∫ B dl = 0.78Tm @ 90°
Detectors installed/active this year
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Detectors installed this year
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08.08.96 History
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02.20.98
History
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01.29.99
History
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06.30.99
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11.30.99
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03.21.00
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09.05.00
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History
10.25.00
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How to Characterize a Collision
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IR
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• Common to all experiments (Luminosity)
• measure neutral energy within a 2 mrad cone about the beam direction, centrality trigger
Zero Degree Calorimeter
Single neutron peak
Coincidencewith BBC
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BBC Vertex resolution
2x64 Quartz Cherenkov counter wrapped around the beam pipe start timing (40ps), vertex location multiplicity
Beam Beam Counter
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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.
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DataAQuisition
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First Event
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• 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 !
Data
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02 04 06 08 0 100 120 140 160 180 200 2200
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200 PC3 (east) vs PC1 (east)
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nTOF vs PC1 (east)PC1 (east) vs DC
Correlations
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Central arm, side viewDetail of South-West Side
PID with tracking and RICH
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Note: * No slewing correction * Applied track association cut : r = 5 cm * No acceptance/efficiency/decay corrections
TOF Particle Identification
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So far for the first part;continue with John. G. Lajoie
Iowa State University