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News etc

News etc. HCAL General Meeting April 21, 2011. LHC. 50 ns operation progressing rapidly though erratically Now ~400 bunches per beam and 4E32cm -2 s -1 (~10pb -1 per good day ) CMS already >50pb -1 in 2011 Could reach ~900 bunches and <1E33 by technical stop in 2 nd week of May

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News etc

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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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