RPC Efficiency Status RPC Efficiency Status Camilo Carrillo Camilo Carrillo On behalf of the RPC Group On behalf of the RPC Group Departamento de Física UNIVERSIDAD DE LOS ANDES Bogotá, Colombia Workshop RPC Italia Workshop RPC Italia Ischia Ischia September 20 – 22 2009 September 20 – 22 2009
Camilo Carrillo On behalf of the RPC Group. RPC Efficiency Status. Workshop RPC Italia Ischia September 20 – 22 2009. Departamento de Física UNIVERSIDAD DE LOS ANDES Bogotá, Colombia. Our tools for RPC Efficiency Where to find the results of CRAFT09 Analysis - PowerPoint PPT Presentation
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RPC Efficiency StatusRPC Efficiency Status
Camilo CarrilloCamilo Carrillo
On behalf of the RPC GroupOn behalf of the RPC Group
Our tools for RPC Efficiency Where to find the results of CRAFT09 Analysis Historical Plots for the efficiency DQM + Storage Plot New Muography Status in the EndCap HV Scan Chambers in Plateau HV Scan Double Vs Single Gap Work to be done and conclusions
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Our tools for the efficiency Our tools for the efficiency DT Segment Extrapolation for the Barrel
Advantages.Easy correlation with the conditions of the system HV TH Trigger Rates, B field, etc.2D plotsModifications are independent of CMSSW releases DisadvantagesIs not run automatically in Tier0 (run at CAF)
AdvantagesAutomatically produced in Tier-0Integration to CMS toolsEasy and automatic history plotsDisadvantagesNo 2D plots.Modification attached to CMSSW releases.Results not corrected yet for masked strips!But as much as possible has to be moved from Storage Plot to DQMOffline (Work ongoing)
From the package in DQMOffline (segment From the package in DQMOffline (segment extrapolation) historical plots for the efficiency are extrapolation) historical plots for the efficiency are
automatically producedautomatically produced
Still missing histograms with global info about the efficiency work to be done
Uniform efficiency in plateauUniform efficiency in plateau
Meassurment of the border effect in the efficiency
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2D Efficiency for different HV2D Efficiency for different HV
Open problem, pending excersice with event display
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Distribution of the inefficient extrapolationsDistribution of the inefficient extrapolations
9.2kV
9.1kV
9.3kV
9.0kV
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CRAFT08 Run 67647 9.3kVCRAFT08 Run 67647 9.3kV230mV230mV
CRAFT09 Run 109578 9.3kV CRAFT09 Run 109578 9.3kV 220mV220mV
Comparing Efficiencies for the BarrelComparing Efficiencies for the BarrelCRAFT09 Vs CRAFT08CRAFT09 Vs CRAFT08
Swapped Cables were corrected
Better Synchronization
Few Single Gap Chambers
RPCs are collecting data this year with much better efficiency due to many improvements!
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Results about the endcapResults about the endcap
With the filter asking for correlated segments between different disksResults in DQMOffline Prompt Analysisand Storage Plot don't have this filter
Extrapolating all the segments
Increase of ~5%
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HV Scan CRAFT09 Global PictureHV Scan CRAFT09 Global PictureBarrel
EndCap
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Double Gap Vs Single GapDouble Gap Vs Single Gap
ExampleSingle Gap Chamber
ExampleDouble Gap Chamber
Single Gap Chambers (From Anna C.)W+1 S8 RB3+_UPW0 S6_RB2out_DOWN S1_RB1out_DOWNW-2 RB1out_s12_DOWN
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HV Scan EndCap 220mVHV Scan EndCap 220mV
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Conclusions and Work to be doneConclusions and Work to be done CRAFT09 has shown a better performance of the RPC system in terms of efficiency HV Scan was done with success we have the data and the tools to set the working voltage for future data taking Drop in the efficiency due to the presence of spacers is clear Tool to check the uniformity in the efficiency along the chamber is ready New things to implement in DQMOffline Understand the effect of timing in the endcap efficiency Cut in the selection of the segments for the endcap to be implementedComparison with efficiency from trigger bits Vs CSC segment extrapolation to be doneImplementation in the HLT stream of the segment extrapolation (to select pathological events)Analysis of CRAFT09 data is still ongoingTool Track+Segment to be developed
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BackupHi all,
I think I understand this effect. It has to do with the fact that theCSC trigger was running with a pointing track requirement. It requiresthe coincidence of 2 or more chambers on different disks, and thosesegments must pass an eta difference cut, where eta is computed assumingthe muon came from the nominal vertex. Now, what makes this strange forcosmics is that the CSC chambers are staggered, i.e. overlapping. Thismeans some chambers are close to the disk, and some farther away by thewidth of a chamber. Now it turns out the chambers have exactly the samestaggering on both sides of the YE2 disk (ME2 and ME3). If one chamberis close to the disk, so is the one behind the disk. The neighborchambers are both farther away from the disk. Thus the distance in Zseparating ME2 and ME3 is maximally varying. Since the CSCTF cuts on theeta difference between segments in two disks, those CSCs that are closetogether will have a wider acceptance for cosmics (larger angularacceptance relative to cosmics). Probably worth sketching this out, butthe range of allowed angles for cosmics to pass the eta difference cutis larger when the Z separation is smaller. The odd-numbered chambers ofCSC are the ones with this closer separation, and indeed the CSC DQMplot shows the rate higher for those chambers.
But the rate should not be zero for the even numbered chambers, justreduced. So I don't understand why the plot in Gianni's DT presentationseems to suggest NO muons originating from the even numbered chambers.That is not consistent with the CSC and RPC DQM plots posted.