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CMS Beam Proposal Phase 1 & 2: Ion Running Plans for Future Standards

This proposal outlines the CMS Beam Phase 1 and Phase 2 plans for ion running from 2014 to beyond LS2, including PbPb at 5.5 TeV, pPb, and pp equivalent statistics. The presentation includes detailed studies of various physics opportunities, detector upgrades, and convergence plans for pp and PbPb running. Key issues such as rate capability, level 1 triggers, and performance for high pileup running are addressed. A focus on maintaining performance levels before and after LS2, with the aim of achieving high luminosities and improved trigger capabilities, is outlined. Example physics studies and detector upgrade timelines are also included for reference.

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CMS Beam Proposal Phase 1 & 2: Ion Running Plans for Future Standards

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  1. CMS Beam request proposal • Phase 1: 2014-2018 (up to LS2) • PbPb @ 5.5 TeV: multiple runs with 1-3/nb total • pPb and pp @ 5.5 TeV equivalent statistics • Phase 2: 2020- (LS2 and beyond) • PbPb @ 5.5 TeV: increase total Lint to 10/nb* • additional nuclei (Ar+Ar?) • (ceterum censeo - pp baseline needed) • *10/nb preliminary target pending further studies, maybe more • All ion running at max. possible inst. Lumi. • PbPb~20kHz (2e27) before LS2, >50kHz (>5e27) after LS2 • pPb 5e29 - 1e30? • pp reference at 5.1 and 5.5 TeV in ncoll weighted lumi. needs to keep up with the PbPb integrated lumi. • Should be added to the presentation on special pp running conditions by H. Wessels

  2. (Examples of) Physics opportunities • Phase 1 (up to LS2) • First measurement of Z0-jet correlations • Multi-jet correlations • Detailed studies of pathlength/systemsize dependence • photon-jet vs photon pT, centrality, event plane • b-jet • Charmonium and bottomium suppression (regeneration?) • Phase 2 (LS2 and beyond) • High precision Z0-jet • Azimuthal correlations for rare probes (Ψ’) • Multi-object correlations • e.g. (photon-jet)-jet • TeV-scale jet quenching • Will prepare some example physics studies for the ECFA meeting • No time before ~August

  3. Detector upgrades • Detector upgrades are planned for pp • maintain performance for pileup > 100 running • Convergence of plans for pp (SLHC) and PbPb • Key issue for HI: Rate capability at high occupancy • PbPb input rate for high level trigger limited to < 3kHz • Highest foreseen PbPb luminosities require 0.95 rejection at level 1 (compared to 0.5 achieved in 2012) • jet triggers • single calo tower triggers (⇒ HLT single track trigger) • requires background subtraction at level 1 • First round of detailed studies concluded

  4. Level 1 trigger upgrade • “2015 upgrade”: addtl’ cards/optical links to allow background determination in phi rings • Detailed emulation shows that desired rejection (>10) can be achieved with moderate jet thresholds • sufficient up to LS2 (≈20kHz) • “SLHC upgrade”: Fully reconfigured system with higher granularity • further improved rejection for photon and single track triggers • sufficient up to ≈50kHz • Convergence of CMS-HI and CMS-pp L1 trigger needs/plans

  5. Backup

  6. ALICE plan so far (From Andreas Slides) • 2013-14 Long Shutdown 1 (LS1) completion of TRD and CALs • 2015 Pb-Pb at /sNN = 5.1 TeV • 2016-17 Pb-Pb at /sNN = 5.5 TeV • 2018 Long Shutdown 2 (LS2): DETECTOR & LHC-Pb-lumi UPGRADE • 2019-2021: Ar-Ar, p-Pb, Pb-Pb • 2022 Long Shutdown 3 (LS3) • 2023-~2025: Pb-Pb at 5.5 TeV till 10 nb-1 + pp reference at 5.5 TeV

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