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PHENIX Special Runs In Run 9

This document outlines the priorities and running conditions for Run 9 of the PHENIX experiment at Brookhaven National Laboratory, presented by John Haggerty. It includes details on HBD commissioning, longitudinally polarized proton-proton collisions, muon trigger testing, transverse running, and other special conditions. It also discusses the possibility of short run extensions and 22.4 GeV comparison running for heavy ion collisions.

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PHENIX Special Runs In Run 9

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

  2. Priorities for this run (time ordered) • HBD commissioning at the beginning during setup • Accumulate at least 10 pb-1 of longitudinally polarized pp at 500 GeV • 5 weeks of physics with the minimum delivered luminosity 40 pb-1 * 0.5 (vertex) * 0.89 (livetime) * 0.77 (uptime) = 13.6 pb-1 • Luminosity and polarization development at 500 GeV to fill out ten week run • 200 GeV longitudinally polarized pp is next priority, but only if the run is extended long enough to achieve our physics priority: • “Longitudinally polarized proton-proton collisions at √s = 200 GeV with 60% average polarization for 10-12 weeks, sufficient to record an integrated luminosity of about 25 pb-1 in PHENIX and about 50 pb-1 in STAR.” John Haggerty

  3. Running conditions needed for HBD testing • The Central Magnet field configuration has to be the lower field “+-” configuration for HBD commissioning during the setup period through the first week of stable “physics” running • Switching the field to “++” requires a few hours between fills • It is possible we will need to request 1-3 shifts at that time to physically remove the HBD John Haggerty

  4. Running conditions needed for muon trigger • We presently do not envision any special running conditions for testing these systems John Haggerty

  5. Transverse running • We’ll want some small amount of transverse running to commission improved local polarimetry, which we can probably get parasitically with machine development, but if that isn’t sufficient, we’d want one or more overnight shifts of transverse running early in the run John Haggerty

  6. Other special conditions • Low luminosity running at 500 GeV • At top luminosity, very large double interaction rate (>50% of crossings are multiple interactions at the beginning of store) • If the luminosity is as high as we think it will be, we may need to accumulate some fraction of the data with reduced luminosity • Zero field runs • PHENIX needs more frequent zero field runs for beam position measurement and alignment; usually little effect on RHIC • Vernier scans • More frequent vernier scans are useful for luminosity determination John Haggerty

  7. Short run extensions If the run is extended for a short period (1-2 weeks) after the 500 GeV run, what should we do? • Continue data taking and luminosity development at 500 GeV if it is productive • If statistics are marginal but luminosity and/or polarization are still increasing, it would be most productive to extend the 500 GeV run • If we have exceeded our minimum goals at 500 GeV, we should go on to other running priorities: 22.4 GeV pp comparison running John Haggerty

  8. 22.4 GeV comparison running • Improve systematics on RAA at lowest RHIC energy • Heavy ion collisions at RHIC lack comparison data from pp • BUP asks for 2.5E9 events sampled • Should prepare more detailed luminosity and trigger projections, but probably 1 week sufficient • Minimal setup should be needed John Haggerty

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