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PHENIX Run 9 Planning: Proton-Proton Collisions at 500 GeV for W Boson Production

This project involves planning and executing Run 9 at the Brookhaven National Laboratory, focusing on longitudinally polarized proton-proton collisions at 500 GeV. It includes assumptions, PAC recommendations, and specific physics goals such as measuring backgrounds, testing electronics, and studying production cross-sections of particles. Detector upgrades, such as HBD and Muon Trigger, are being implemented for enhanced performance. Operational efficiency and detector repairs are also key aspects considered. The interaction between RHIC and PHENIX is optimized to achieve high-quality data collection and analysis.

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PHENIX Run 9 Planning: Proton-Proton Collisions at 500 GeV for W Boson Production

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  1. PHENIX In Run 9 John Haggerty Brookhaven National Laboratory John Haggerty

  2. Run 9 assumptions PAC recommendation: 3. Longitudinally polarized proton-proton collisions at √s = 500 GeV for 5 weeks to allow beam development and commissioning by C-AD, a first measurement of W boson production in PHENIX, and background studies in STAR. John Haggerty

  3. Run 9 planning Run 9 planning is fairly far along • Beam Use Proposal and PAC guidance • Planning document (TN-427) 200 GeV pp • October DC meeting parade of systems • December physics/trigger/daq/analysis DC meeting • Steve Pate agreed to serve as Spin Coordinator John Haggerty

  4. Physics goals at 500 GeV • Measure backgrounds under high pT muons • Test muon trigger electronics (currently being installed) • Measure production cross sections 0,  to pT ~ 30 GeV, J/,  • Measure ALL for 0,  • With 25 pb-1 record W’s in central arm • ~500 W+ and ~90 W- • First look at AL and cross section John Haggerty

  5. Central arm W • Modify EMCAL gain • Develop analysis • Cross section measurement • First look at AL Central arms W+e+ ~21 pb W-e- ~3 pb John Haggerty

  6. Detector issues for 500 GeV running • Magnetic field configuration • HBD needs “field free” bucked central field (“+-”) • But momentum resolution in central arms is compromised by reduced field • EC agreement to switch field to “++” after first week of physics running • Gain changes in EMCAL (present dynamic range set to 20 GeV); mostly done with laser, should be close at beam startup John Haggerty

  7. Upgrade detectors in run 9 • Upgrade detectors in Run 9 are partial installations or engineering runs: • HBD • Muon Trigger (MUTR FEE upgrade) • Muon RPC prototype • Absorber in muon arm • First goal of upgrade detectors: do no harm John Haggerty

  8. HBD • HBD.W installed • HBD.E scheduled for installation December 16 • Will need to gain operational experience with DAQ, HV, monitoring, calibration, analysis • “+-” field configuration necessary for HBD operation John Haggerty

  9. Muon trigger upgrade • 3 components • MuTr electronics • RPC layers • Trigger logic RPC1 RPC3 Major installation effort under way… will complete North arm MuTr FEE upgrade in this shutdown John Haggerty

  10. RPC prototype • Resistive Plate Chambers • Fast response • Good spatial resolution • Low cost, CMS experience • Installing prototype sector and electronics • Engineering run John Haggerty

  11. 12 x xcvr 12 x xcvr 12 x xcvr 12 x xcvr Virtex-5 LX110T Virtex-5 LX110T Virtex-5 LX110T Virtex-5 LX110T Muon trigger board One board processes four trigger octants (one octant per tile) Testing of prototype late in the run (RPC1,3 @ 2.8Gbit) P1 VME Interface P0 (MuTr St2 @ 2.8Gbit) P2 (MuTr St1 @ 2.8Gbit) (MuTr St3 @ 2.8Gbit) Virtex-5 LX110T P3 (9 fibers per octant) John Haggerty

  12. Many other detector repairs/improvements • DAQ improvements to increase livetime, event rate • EMCAL/RICH trigger efficiency improvements • DC and PC repairs • MUTR high voltage stability • Could be some additional small tests/prototypes for upgrades 8 kHz Run 6 ERT turnon John Haggerty

  13. Operational Efficiency • Review of operational efficiency at S&T Review July 7-9, 2008 • Short summary (from Run 8 d+Au): • 50% in vertex cuts (no change expected) • 77% uptime (modest improvements possible, but less with development) • 89% livetime (slight improvement possible with higher rates) John Haggerty

  14. Final days schedule • Need to complete MuTrig installation, remove scaffolding; install HBD, RPC prototype • Expecting closing up the shield wall beginning of January, 2009 then safety and detector checkout John Haggerty

  15. RHIC/PHENIX interaction • Magnetic field change “+-” to “++” shortly after physics run begins • Tunnel access for RPC3 prototype during startup • Optimizing the big three: luminosity, polarization, background • Improve communication with MCR (discussion with Lee Hammons) John Haggerty

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