1. 08-Sep-00PHENIX Upgrades PHENIX has a phased strategy to q Complete the current detector q Enhance its capabilities q Extend its physics reach

2. 08-Sep-00PHENIX Upgrades Completion l Complete the central arms (2001) q 4 additional sectors of EMCal readout q 2 additional sectors of TEC readout q Install Pad Chambers 2 and 3 in West Arm l Prepare for muon physics (2001) q Install South Muon Magnet with 3 stations of tracking q Instrument South Muon Identifier panels l Complete vertex detector (2001-2) l Commission (2001-2) q Appropriate triggers q Additional DAQ bandwidth (NB: All detectors and front ends allow running at x10 Au-Au design luminosity) l Complete North Muon Arm (2002-3)

3. 08-Sep-00PHENIX Upgrades In Pictures For 2001 Run:

4. 08-Sep-00PHENIX Upgrades Enhancing Capabilities Enhancing Capabilities Planned and potential enhancements: q Upgrade Time Expansion Chamber to a TRD u Instrument all six planes (currently four) u Install radiators u Upgrade gas system (to recirculate Xe mixture)  Improved e/  rejection at high momentum q Upgrade RICH u From current gas ( CO 2 ) to Ethane  Improved photon yields for better e/  rejection q Upgrade muon spectrometers u Instrument anode wires èImprove pattern recognition at high multiplicities

5. 08-Sep-00PHENIX Upgrades Extending Physics Reach Extending Physics Reach l Low-mass dileptons  Requires better Dalitz rejection to measure pair for m(e + e - ) < ~  mass q Goal: Improve S/B from ~1/10 to 10/1 q Anticipated in original design of PHENIX (note “Hadron Blind Detector” from R = 50-200 cm) l Direct detection of open charm q Extraordinary requirement on vertexing capabilities q May be combined with design of Dalitz rejector l Extended proton-nucleus capabilities q Detection of leading proton (Roman pots?)  Characterization of nuclear break-up (multiplicity array at “forward”  ) l Extended photon detection capabilities q High-resolution pre-shower detector q Deploy in “massless gap” of West Arm l Extended jet detection capabilities q Full azimuthal tracking q Benefits both spin and HI measurements