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PHENIX Readiness for Run 7: New Developments and Goals

The PHENIX collaboration prepares for Run 7 with a focus on cosmic ray measurements and operational milestones. Key personnel include spokesperson Barbara Jacak and deputies Yasuyuki Akiba, Matthias Gross-Perdekamp, and Rich Seto. Highlights include data collection strategies for cosmic rays and muons, commissioning of the Hadron Blind Detector (HBD), and enhancements in reaction plane measurement capabilities. The planned operations aim for substantial data collection in Au+Au collisions at 200 GeV and improving detector capabilities for precise measurements of particle properties and backgrounds.

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PHENIX Readiness for Run 7: New Developments and Goals

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  1. PHENIX Ready for Run7 • New Spokesperson – Barbara Jacak (SUNYSB) • Deputies – Yasuyuki Akiba (Riken/BNL), Matthias Gross-Perdekamp (UIUC) , Rich Seto (UCR) • Run Coordinator – Mike Leitch (LANL)

  2. Taking data with cosmic ray triggers (muon, emCal, RXPN, MPC readout) Have also run with all other subsystems in at times DAQ Ready!

  3. Cosmic/W muon ratio estimated to be 1/1 for p>10 GeV, but estimate is unreliable – need measurement! • Cosmic ray in EMCal looks much like high-pT photon • source of high-pT photon background?

  4. Hadron Blind Detector (HBD) HV conditioning with CF4 nearly complete State-of-the-art detector – challenging to commission with AuAu!

  5. MPC-North (& South) 3.1 <  < 3.7 Reaction Plane Detector TOF-W

  6. Tue 1/9 Mon 2/6 Wed 2/7 Thu 2/8 Fri 2/9 Mon 2/12 Tue 2/13 Thu 2/22 Tue 2/27 Thu 3/1 Started PHENIX watch/cosmic-ray shifts Turn on large cooling pump (for magnet operations) ATS (auto. transf. switch) test Magnetic sweep to prepare for magnet tests RHIC – start of cooldown PHENIX Magnet tests Verify magnet & P/S operation fringe fields for MMS+MMN alone & with CM (“++”) Install south muon shielding collar Flammable gas to central-arm detectors (DC/PC) Muon magnets on 24/7 for cosmic ray measurement RHIC – beam in blue ring Start 5-person PHENIX shifts RHIC – beam in yellow ring, 1st collisions? PHENIX Jan-Feb Operations Plan See also: http://www.rhichome.bnl.gov/SchedPhys/FY2007/schedules/RhicRun7StartUp.pdf (Feb 1st vers.)

  7. Backup Slides

  8. PHENIX Shakedown/Cosmic Ray Run • Need Cosmic Ray background measurement for W physics • cosmic/W estimated to be 1/1 for p>=10 GeV, but estimate is unreliable – need measurement! • ID-1Deep LL1 in each arm & coincidence of North & South (no BBC) • readout ID, Tr, MPC, RXPN

  9. Goals for Run-7 • Large data set of AuAu sNN½ = 200 GeV • > 1 nb –1 in recorded data • First Operation of the Hadron Blind Detector • Electron continuum measurement in AuAu • Light meson reconstruction using electron channel f,w,h • First Operation of TOF-W • PID out to pT of 8 GeV/c • Identified particle spectra • Identified leading particles in jets • First Operation of RXNP detector • Improve v2 measurement by ~ factor of 2 • First Operation of MPC-N • Contribute to reaction plane measurement in Au+Au • Further accelerator development of machine performance for p+p @ √s = 500 GeV, 200 GeV

  10. RxNP resolution From Tony, heavy PWG, Jan 4th BBC RP resolution 0% 25% 50% 75% 100%

  11. signal electron  e+ e - po   e+ e - Cherenkov blobs e- partner positron needed for rejection e+ “combinatorial pairs” qpair opening angle total background S/B ~ 1/500 Irreducible charm background all signal charm signal Hadron-Blind Detector (HBD) • “A hadron-blind detector to detect and track electrons near the vertex.” • Dalitz rejection via opening angle • Identify electrons in field free region • Veto signal electrons with partner • HBD: a novel detector concept: • windowless CF4 Cherenkov detector • 50 cm radiator length • CsI reflective photocathode • Triple GEM with pad readout • Construction/prototype(!)/installation 2005/2006 • Funding: DOE + $250K (NSF) + $100K (Weizmann) + $57K (SUNY-SB)

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