Craig Woody BNL RIKEN Workshop on Current and Future Directions at RHIC Brookhaven National Lab August 9, 2002 PHENIX AA Related Upgrades

C.Woody Riken Summer Workshop 8/9/02 2 Complete the PHENIX Baseline Detector Run 2 at RHIC took place with the Central Spectrometer and South Muon Spectrometer North Muon Spectrometer is being installed during the present RHIC shutdown This will complete the main items of the PHENIX Baseline Detector Future upgrades will focus on enhancing the physics capability and and extending the physics reach of the baseline detector. PHENIX Upgrade Plan

C.Woody Riken Summer Workshop 8/9/ Run New detectors: 8 complete sectors of EMCAL (6 PbSc, 2 PbGl) Rebuilt drift chamber Multiplicity and Vertex Detector (MVD) South Muon Spectrometer NTC and T0 counters for pp Upgraded trigger capabilities (Level 2 J/y, EMCAL-RICH) Upgraded data acquisition

C.Woody Riken Summer Workshop 8/9/ Run New detectors: North Muon Spectrometer 3 stations of muon tracking chambers + muon ID chambers TEC upgraded to TRD Shower max for ZDCs Forward hadron calorimeters Upgraded trigger Upgraded data acquisition

C.Woody Riken Summer Workshop 8/9/02 5 Physics with the PHENIX Baseline Detector Temperature and Energy Density – dN/dy, E T, Single particle spectra Jet Quenching, Medium Effects – High p T jets using leading  o,   – Direct g s Space-Time Evolution – HBT( , KK,pp), Flow – Event by Event Fluctuations Deconfinement – J/ ,  ’  e + e -,  +  -, U  +  - Chiral Symmetry Restoration – , ,  mass, width –  branching ratios Heavy Quark Production – K, , J/ ,  ’, U, open charm Gluon spin:  G – Direct , high p T  ’s Sea quark spin:  u,  d – W + /W - production – Drell-Yan Polarization Heavy Ions Spin

C.Woody Riken Summer Workshop 8/9/02 6 New Physics to be Addressed with an Upgraded PHENIX Detector Low mass dilepton pairs Improved measurements of heavy flavor (c,b) production Jet studies and g -jet correlations High p T identified particles Rare processes Inclusive particle spectra and direct g s out to high p T Drell-Yan continuum above the J/ Y Upsilon spectroscopy - U (1S), U (2S), U (3S) W-production …

C.Woody Riken Summer Workshop 8/9/02 7 Good rejection against Dalitz pairs and conversions, along with good electron efficiency down to low momentum, to measure low mass electron pairs Excellent vertex resolution to directly measure open charm and bottom decays by measuring displaced secondary verticies Increased tracking coverage over 2 p in azimuth and larger rapidity to measure jets and g -jet correlations Good particle id out to high p T p /K/p separation to p T ~ 10 GeV/c electron identification to p T > 10 GeV/c High rate data acquisition and triggering capabilities for studying rare processes Detector Requirements for New Physics

C.Woody Riken Summer Workshop 8/9/02 8 Upsilon Spectroscopy with North and South Muon Arms Original PHENIX capability ~ 400 U s accumulated in 37 week 2x10 26 RHIC I RHIC II Luminosity (cm -2 s -1 ) 2x x10 27 Weeks Uptime PHENIX/RHIC Trigger/Vertex Reconstructed U  mm Reconstructed U  ee  m ~ 190 MeV  m ~ 240 MeV

C.Woody Riken Summer Workshop 8/9/02 9 Electron ID at low momentum RICH EMCAL E-p matching EMCAL TOF TEC dE/dx E/P ratio All charged With RHIC hit 0.8GeV<p<0.9GeV Random background EMCAL RICH (TOF 400 ps) (C 2 H 6 ) CO 2 Y. Akiba Electron ID in PHENIX TEC dE/dx 4 planes 6 planes

C.Woody Riken Summer Workshop 8/9/02 10 Reconstructed Au-Au Central Collision at s 1/2 = 200 GeV 24 TEC Chambers arranged in four 6-Chamber sectors Each 3.7m x 2.0 m chamber contains 2700 wires Used for tracking and PID (dE/dx).  x = 260  m dE/dx: e/π = 5% at 500 MeV/c (4 planes), e/π = 1.5% (6 planes) Important for momentum resolution p T > 4.0 GeV/c PHENIX Time Expansion Chamber

C.Woody Riken Summer Workshop 8/9/02 11 TRD Radiator PHENIX TEC/TRD Radiators Polypropylene fiber/foam module packs Self supporting Recirculating Xe gas system Goal is complete installation prior to start of RHIC Fall 2002 run. p efficiency (%) P p GeV/c Electron ID at High Momentum with TRD

C.Woody Riken Summer Workshop 8/9/02 12 No enhancement in pp and pA collisions Strong enhancement of low-mass e + e - pairs in A-A collisions (wrt to expected yield from known sources) Enhancement factor (.25 <m<.7GeV/c 2 ) : 2.6 ± 0.5 (stat) ± 0.6 (sys) Low Mass Electron Pairs

C.Woody Riken Summer Workshop 8/9/02 13 Low Mass Electron Pairs in PHENIX Dilepton spectra from central Au-Au collisions at full RHIC energy R.Rapp Poster at QM2002 K. Ozawa and C. Aidala Charm signal Total Combinatorial Background

C.Woody Riken Summer Workshop 8/9/02 14 e+e+ e-e- TPC/HBD e-e- e+e+ p p p V0V0 measured in outer PHENIX detectors (P e > 200 MeV/c) Operate PHENIX with low inner B field to optimize measurement of low momentum tracks Identify signal electrons (low mass pairs, r,w,f, …) with p>200 MeV in outer PHENIX detectors Identify low momentum electrons (p<200 MeV) using Cherenkov light from HBD and/or dE/dx from TPC Calculate effective mass (or opening angle) between all opposite sign tracks identified as electrons ( e electron > 0.9, p rej > 1:200) Reject pair if mass < 130 MeV (or q < 200 mrad) Must provide sufficient Dalitz rejection (>90%) while preserving the true signal Strategy for Low Mass Pair Measurement

C.Woody Riken Summer Workshop 8/9/02 15 Dalitz Rejection and Vector Meson Survival Probability Poster at QM2002, K. Ozawa and C. Aidala Residual Background

C.Woody Riken Summer Workshop 8/9/02 16 TPC tracking coverage Df=2p |h|<1.0 dp T /p T ~.02p Inner Coil creates a “field free” (∫Bdl=0) region inside the Central Magnet PHENIX Inner Detector Currently being installed during 2002 shutdown

C.Woody Riken Summer Workshop 8/9/02 17 Drift regions HV plane (~ -30kV) TPC Readout Plane Readout Pads D R ~ 1 cm f ~ 2 mm CsI Readout Plane GEM, m Mega TPC/HBD Conceptual Design (PHENIX + STAR)

C.Woody Riken Summer Workshop 8/9/02 18 Must have short drift time to work at the highest luminosities planned for RHIC fast gas (e.g., CF 4 ) Require sufficient two track resolution to handle high track densities and possible space charge limitations Must have sufficient charge deposition and sampling to do good dE/dx measurement for electron id below 200 MeV CsI photocathode layer provides additional independent electron id Should have minimal material to minimize conversions and multiple scattering for outer detectors (< 1% X 0 ) Must keep the number of readout channels to a “reasonable” number ~ K with high density readout planes (=> significant development in integrated electronics) Detector Requirements for TPC/HBD

C.Woody Riken Summer Workshop 8/9/02 19 Separation of charm and bottom decays by measuring displaced secondary vertex improve measurement accuracy of c and b cross sections to < 10% separate c and b contribution in each p T bin (flavor dependence of QCD energy loss) Direct measurement of D mesons combined with particle id, can measure D  K p modes  p T spectrum of D’s (flavor dependence of QCD energy loss) Open heavy flavor (Muon Arms) D  m X, B  J/ y  m + m - Improved momentum resolution for Upsilon spectroscopy Enhanced capabilities for spin physics wider acceptance ( g -jet & jet-jet studies, c,b-tagging, etc) Enhanced physics capabilities for charm and bottom in pA Enhanced Physics Capabilities with a High Precision Vertex and Tracking Detector

C.Woody Riken Summer Workshop 8/9/02 20 PHENIX already sees evidence for large open charm production at RHIC R. Averbeck, QM 2002 A high precision vertex detector will allow a clean separation of charm and bottom decays m c   eX GeV  m % D  6.75 D ±  17.2 B  5.3 B ±  5.2 Need secondary vertex resolution ~ m m Charm and B Decays

C.Woody Riken Summer Workshop 8/9/02 21 Simulation by J. Heuser Pixel barrels (50 mm x 425 mm) Strip barrels (80 mm x 3 cm) Pixel disks (50 mm x 4 mm) e dca D eX primary vertex ct 0 = 125 mm ct ± = 317 mm 1.0% X 0 per layer 500 mm Be Beam Pipe 1.2<|h|< 2.4 |h|< 1.2 Proposed Silicon Tracker in PHENIX

C.Woody Riken Summer Workshop 8/9/02 22 GEANT Without cuts on displaced vertex – S/B ~ 1 for high-pt – S/B ~ 0.1 p T = 0.5 GeV/c S/B improves to > 10 for p T > 1 GeV/c with DCA cut ~ 100 m m Simulation by J. Heuser Signal/Background with DCA cut

C.Woody Riken Summer Workshop 8/9/02 23 Silicon strips implementation of strips is straightforward (but needs electronics) mainly for pp (investigating usefulness in HI) Silicon Pixels (hybrid) sensor detectors being developed at BNL for NA60 hope to use NA60/ALICE readout chip in PHENIX environment active participation by PHENIX members in NA60/ALICE hybrid development Silicon Pixels (monolithic Active Pixel Sensors) ultimately the most desirable solution being developed by LEPSI, LBL(STAR), Iowa State(PHENIX) presently readout time is a problem time scale for implementation may be long Technology Choices for a Precision Silicon Vertex Tracker

C.Woody Riken Summer Workshop 8/9/02 24 Study flavor dependence of jet quenching (tag with identified high p T particle) Important to extend spectra of identified charged particles out to as high p T as possible Enhanced High p T Physics PHENIX Preliminary D. d’Enterria QM 2002 T. Sakaguchi QM 2002

C.Woody Riken Summer Workshop 8/9/02 25 EMCAL TOF resolution ~ 400 ps < 1 GeV TOF resolution < 100 ps p /K < 2.5 GeV K/p < 4.5 GeV PHENIX PID RICH Threshold (GeV/c) p K p CO C 2 H

C.Woody Riken Summer Workshop 8/9/02 26 Extended PID with Aerogel Aerogel together with TOF can extend the PID capability up to ~ 10 GeV/c n=1.007  th~8.5 Aerogel n=  th~34 RICH  ~100 ps TOF Kaon-Proton separation Pion-Kaon separation Y. Miake

C.Woody Riken Summer Workshop 8/9/02 27 Aerogel Detector BELLE Aerogel Module Shown on PHENIX East ARM over TOF but would most likely go on West Arm between PC2 and PC3 Proposal by Tsukuba Group to install 400 liters of Aerogel, segemented into 300 modules

C.Woody Riken Summer Workshop 8/9/02 28 Present PHENIX DAQ Capabilities Trigger rates: Ran with up to 1.2 kHz rate in Run 2 Expect possible raw trigger rates of ~ 11 kHz (HI) and 800 kHz (pp) in Run 3 PHENIX should be able to take ~ 8 kHz (limited mainly by multiplexing of FEMs) Maximum Level-1 trigger accept rate = 25kHz (requires demultiplexing) Data volume: Au-Au pp Event size ~ kB ~ 50 kB Level 2 Trigger (Event Builder): Au+Au: 150kB x 8 kHz = 1200 MB/s Archiving rate at RCF ~ 40(60) MB/s => Need factor ~ 30(20) rejection at Level 2 RHIC luminosity reached in Run 2 Au-Au L ~ 2 x cm -2 s -1 (blue book - briefly) p-p L ~ 1 x cm -2 s -1 (~ 10% blue book, 1% spin design) Conclusion: PHENIX already has a very good high rate DAQ system

C.Woody Riken Summer Workshop 8/9/02 29 DAQ and Trigger Upgrades Expected luminosity upgrades at RHIC (RHIC-II) Au-Au L ~ 8 x cm -2 s -1 (x40) O-O L ~ 1.6 x cm -2 s -1 p-p L ~ 4 x cm -2 s -1 (possibly -> 4 x cm -2 s -1 ) Changes and Improvements to DAQ Zero suppression in FEMs Upgraded DCM modules Gigabit ethernet to replace ATMs Level 3 trigger Up to 100 MB/s data logging rate at RCF (similar to ATLAS + CMS; ALICE ~ 1250 MB/s) New physics requires high luminosity New detectors produce large data volumes (silicon, TPC)

C.Woody Riken Summer Workshop 8/9/ Completion of Baseline Detector Install North Muon Spectrometer Upgrade TEC to TRD Silicon strip detectors Prototype silicon pixel detector Prototype HBD (upgradable to TPC) Prototype aerogel detector Complete silicon pixel detectors Complete TPC/HBD Complete aerogel detector Time Scale and Cost R&D presently supported by various institutional funds (LDRDs,RIKEN) requires ~ 3-4 $M over 3-4 yrs needs DOE funding to continue Construction Staged approach, with detectors requiring less R&D to be implemented first NSAC plan shows $80M in RHIC II detector upgrades over 7 years starting in FY05