UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached...
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Transcript of UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached...
![Page 1: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/1.jpg)
UCLA group meeting 1/9
CSC update – my random summaryCSC update – my random summary
• Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns bunch spacing “soon”? Possibilities up to 3.5E33 (!) and 4.2 fb-1(!) in 2011. Running could be extended into 2012
• See the following for discovery of Higgs background
![Page 2: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/2.jpg)
UCLA group meeting 2/9
4-mu event!4-mu event!
• Masses and lack of other activity are consistent with a Z0Z0 +- +- event
• This is the main background to the high-mass Higgs search
• Went unnoticed by “exciting event selection” tools for 2 weeks, ahem
![Page 3: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/3.jpg)
UCLA group meeting 3/9
CSC – other good newsCSC – other good news
CSC efficiencies verified to be significantly higher in DT-CSC overlap region after technical stop fixes
muon L1 pre- and post-firing shown to be at ~1% level in DTs and few per mill in CSC (e.g. Chris study)
Neutrons start to show up in data (see Greg talk)
CEOs plus daily CSC validations shifts appear sufficient
![Page 4: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/4.jpg)
UCLA group meeting 4/9
CSC update – issues ICSC update – issues I
• Muon slow particle trigger idea presented Nobody in GMT group can write firmware for it anymore Calorimeter slow particle group is somewhat interested
• Neutron run taken at L~2E31• Clear evidence of extra hits seen in TMB counter rates• Would like to see the actual rates, neutron cross-sections per
chamber type
• CFEB muonic timing Width of the distribution not obviously narrowed… to be
investigated
![Page 5: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/5.jpg)
UCLA group meeting 5/9
CSC update – issues IICSC update – issues II
• 2ns tweaks can improve ALCT timing substantially:
From Chris’ talk to L1 trigger DPG 23-Sept-2010
![Page 6: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/6.jpg)
UCLA group meeting 6/9
CSC update – issues IIICSC update – issues III
• TMB 3.3v supply droop below 3.135v spec• Is it corroding fuses?
• Investigating TMBs taken from collision hall, gold-plated fuses (tomorrow Greg, Misha)
• CERN does elemental analysis with electron microscope (EDS, 1 week)
• Is it corroding CRB-backplane connections?• Full characterization of ~75 drooping TMBs by Clare
by Weds. Ops meeting?
![Page 7: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/7.jpg)
UCLA group meeting 7/9
CSC update – issues IVCSC update – issues IV
• CSC efficiencies: not a very clear picture• Certainly much better than before Technical Stop• Hardware (CSC-TF) has seen many changes, so
keep it unchanged for the rest of this year• Numerous conflicting analyses - suggest to:
• Define a sample of well-identified but unbiased muons as denominator
• Break down by every trigger & offline selection level• Show eta-phi plot of losses• Have high statistics• Must compare to correct Monte Carlo simulation
version to understand properly• Algorithms were always tuned so MC performs well!
![Page 8: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/8.jpg)
UCLA group meeting 8/9
CSC update – issues VCSC update – issues V
• High luminosity (3.5E32?) and 50ns bunch spacing issues
• Wide readout windows again lead to missing (CLCT) or duplicate (CFEB, ALCT) CSC data
• Any other issues? Anyone?
• CSC daily monitoring shifts need streamlining
• The work seems to have begun
![Page 9: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/9.jpg)
UCLA group meeting 9/9
CSC update – issues VICSC update – issues VI
• Overall CSC group structure• Probably heading towards Ops, DPG, and Upgrade
deputies by ~December
• CSC Detector Performance Group (DPG)• Muon DT has proposed fully merging CSC, DT, and
RPC groups• Not much enthusiasm by CSC collaborators
• Current meetings work pretty well, ~40 people
• Establish the sub-structure?• Good to organize high-priority activities• Good to know who to ask about specific issues• Bad if people feel locked into the structure
![Page 10: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/10.jpg)
UCLA group meeting 10/9
Stuff mentioned beforeStuff mentioned before
• Don’t need to go through these again today
![Page 11: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/11.jpg)
UCLA group meeting 11/9
CSC nagging concerns ICSC nagging concerns I
• Changes to data structure• ALCT timing information from Chris DIGIs?• Mini-scope etc. in TMB• Allowed now for future CMSSW version 3.9 ??
• Improved documentation• General muon DPG detector performance article?
Might naturally break into 3 papers, but preferably not.
• CSC synchronization article• Twikis, especially on timing, online changes• Storage and tracking of firmware versions ALCT,
TMB, CCB, MPC, DDU, DCC, CSCTF, VCC, etc.
![Page 12: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/12.jpg)
UCLA group meeting 12/9
CSC nagging concerns IICSC nagging concerns II
• Triggers & datasets: where do all of these go?
• Single high-Pt triggers and datasets• Onia triggers and datasets• Single low-Pt (e.g. b physics) triggers and datasets• Halo muons• CSC activity triggers
• Everyone sees a “piece” of the puzzle…• Would like to assemble known information…
• Are we missing anything?• Need to improve DIGI information on timing, e.g. CSC
anode timing?
![Page 13: UCLA group meeting1/9 CSC update – my random summary Another good week for LHC: L=0.9E32 reached (nearly the goal of 1E32 in 2010) Test run with 50 ns.](https://reader035.fdocuments.in/reader035/viewer/2022062518/5697bf7b1a28abf838c839c7/html5/thumbnails/13.jpg)
UCLA group meeting 13/9
CSC upgradeCSC upgrade
• Technical Proposal muon section in decent shape, maybe more verbiage on physics justification
• David S. and Taylor to work on actual justification during Fall
• Upgrade ME4/2:• Panels via CERN – try for sole-source procurement• ME4/2 electronics – make at least one endcap of
CFEBs to decouple schedule from ME1/1?