RPC Efficiency StatusRPC Efficiency Status

Camilo CarrilloCamilo Carrillo

On behalf of the RPC GroupOn behalf of the RPC Group

Departamento de Física

UNIVERSIDAD DE LOS ANDES

Bogotá, Colombia

Workshop RPC ItaliaWorkshop RPC ItaliaIschiaIschia

September 20 – 22 2009September 20 – 22 2009

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OutlineOutline

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

DQMOffline Prompt Analysis Storage Plots (Includes 2D histograms) HLT Module (work is ongoing) Track + Segments (coming soon)

CSC Segment Extrapolation for the EndCap DQMOffline Prompt Analysis Storage Plot HLT Module (work is ongoing)

Track + Segments (coming soon)

Track Extrapolation (Whole system with p-p) Prompt Analysis

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Just a reminder for the Segment extrapolation Just a reminder for the Segment extrapolation

RPC Rec Hit

Point extrapolated

from DT Segment

We plan to store this

information in the event

X

Y

X

Y ResidualWe use residuals to check the quality of the tool used to measure RPC efficiency with segment extrapolation.

RPC

DT/CSC

RPCLocalFrame.

Residual

The idea for the track extrapolation is very similar.

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Agreement between different tools Agreement between different tools and validationand validation

DT Segment Track

By Raffaello

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CRAFT09 results for efficiency run by run CRAFT09 results for efficiency run by run where to find it?where to find it?

Storage Plot.Storage Plot.https://twiki.cern.ch/twiki/bin/view/CMS/RPClistofRunP5CRAFT09

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)

DQMOfflineDQMOfflinehttps://cmsweb.cern.ch/dqm/offline

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)

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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

http://cmstac05.cern.ch/historic_dqm/HistoryDQM/AllRuns/Plots_RPCHistoricInfoClient

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History Plots CRAFT09 Barrel Storage PlotHistory Plots CRAFT09 Barrel Storage Plot

Run #

95%

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History Plots CRAFT09 EndCap Storage PlotHistory Plots CRAFT09 EndCap Storage Plot

Run #

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Better Muongraphies w.r.t. CRAFT08Better Muongraphies w.r.t. CRAFT08

Spacers

Corners of the gas gaps

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.

Regards, Darin