US

AFEB timing in CSCs in splash events, run 120042

N. Terentiev, CMU

CSC Synchronization meeting Nov. 16, 2009, CERN

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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IntroductionIntroduction

• Data:• run 120042 splash events (475 events available)• beam 2 goes from ME- to ME+• CMS trigger is provided by ECAL• using "collider" mode of CSC timing• ME- was delayed by 2 BX to coincide with ME+

• Analysis:• CMSSW_3_2_2, dataset /BeamHalo/BeamCommissioning09-v1/RAW• CSCValidation package (modified module doAFEBTiming)• CSCWireDigi collection provides for each hit in CSC layer:

• wire group number

• 25 ns time bin number where the hit was latched by ALCT ("time bin ON")

• up to 16 non empty time bins recorded

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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IntroductionIntroduction

• doAFEBTiming module outputs for each CSC:• 2D distribution of the first time bin number which is ON versus the wire group

(presented with use of AFEB channel number, left figure)

• 2D distribution of the number of time bins ON versus the wire group (right figure)

• we are using MEAN of the first time bin number ON distribution for timing

• number of time bins ON is sensitive to AFEB oscillations and pickup noise.

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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AnalysisAnalysis

• In splash events anode mean timing distributions are not flat within CSC (examples are for ME-3/2/15)

• To have global picture for all CSCs use MEAN averaged over • first 3 AFEBs (narrow part of the chamber, "bottom") and

• last 3 AFEBs (wide part of the chamber, "top"), see next slides.

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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AnalysisAnalysis

• In cosmic muons data from CRAFT2009 anode mean timing distribution is within 1 BX in each CSC ( example for ME-3/2/15, right, see also backup).

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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AnalysisAnalysis

• Timing in ME1/1

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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AnalysisAnalysis

• Timing in ME1/2

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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AnalysisAnalysis

• Timing in ME1/3

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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AnalysisAnalysis

• Timing in ME2/1

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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AnalysisAnalysis

• Timing in ME2/2

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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AnalysisAnalysis

• Timing in ME3/1

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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AnalysisAnalysis

• Timing in ME3/2

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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AnalysisAnalysis

• Timing in ME4/1

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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AnalysisAnalysis

• Timing in ME4/2

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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SummarySummary

• Anode timing in Nov. 2009 splash events (run 120042)• still different for ME+ and ME-• approximately flat in CSCs in inner rings (within 1BX)• anode signals come later by ~1-1.5 BX in outer parts of CSCs ("top") of

outer rings ME2/2 and ME3/2 in both endcaps• splash events hard to interpret due to extremely high occupancy of anode

wires and cathode strips in CSCs• coming beam halo events should provide more clear picture

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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BackupBackup

• Timing in ME1/1 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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BackupBackup

• Timing in ME1/2 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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BackupBackup

• Timing in ME1/3 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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BackupBackup

• Timing in ME2/1 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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BackupBackup

• Timing in ME2/2 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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BackupBackup

• Timing in ME3/1 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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BackupBackup

• Timing in ME3/2 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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BackupBackup

• Timing in ME4/1 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN

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BackupBackup

• Timing in ME4/2 (CRAFT 2009 Summer)