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Rapid Progress in 50 ns LHC Operations and Upcoming CMS Meetings

The latest update from the April 21, 2011, HCAL General Meeting highlights significant progress in 50 ns LHC operations, with approximately 400 bunches per beam and a goal of reaching ~900 bunches by May's technical stop. CMS has already accumulated over 50 pb-1 in 2011, and optimizations for noise filtering and trigger performance are underway. Challenges like HF anomalous events and the need for improved filtering are acknowledged. Upcoming meetings include the USCMS meeting at Notre Dame and CMS Upgrade Week, scheduled for May 10-13.

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Rapid Progress in 50 ns LHC Operations and Upcoming CMS Meetings

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  1. News etc HCAL General Meeting April 21, 2011

  2. LHC • 50 ns operation progressing rapidly though erratically • Now ~400 bunches per beam and 4E32cm-2s-1 (~10pb-1per good day) • CMS already >50pb-1 in 2011 • Could reach ~900 bunches and <1E33 by technical stop in 2nd week of May • 2TS reco for HF. Performs well. Pileup is not a serious issue so far. • Noise hits are an issue for ET/MET trigger bandwidth prescaling • HF and HBHE noise filters retuned for 50ns. Will deploy in HLT after May technical stop • HF: deploy isolation filtering in all jet triggers, but switch off timing/pulseShape filtering pending further studies • HBHE: deploy filtering in two parallel trigger paths first for validation • HF pre-BX triggers (window interactions) are a problem for L1… HCAL: seeting up for fb-1’s at 50 ns

  3. HCAL • HF anomalous events • The HF window interactions are timed to trigger early, the filtering possible at L1 cannot be fully effective  CMS will veto BX-1 (at least for now) • Multi-window clusters, and multi-window plus a multi-TeV pulse are dominant sources of very high ET events • Special meeting following this one • This will require further studies and additional filtering • HF in Jet and Met triggers • Expect filtering at HLT to be very effective • Currently we include 100% or 0% of HF in L1

  4. Announcements/Reminders • USCMS meeting, Notre Dame May 4-7 • https://indico.cern.ch/conferenceDisplay.py?confId=112717 • http://leptoquark.hep.nd.edu/USCMS/ • CMS Upgrade Week, May 10-13 • https://indico.cern.ch/conferenceDisplay.py?confId=136197 • Will be working sessions for HCAL and a re-evaluation of upgrade schedules • RDMS meeting, Alushta (Crimea) May 22-28 • http://rdms2011.kipt.kharkov.ua/rdmses/index • Early part of the week will focus on current operations and physics, and latter part on future physics and upgrades (mid and long term), including HCAL session

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