US AFEB timing in CSCs in splash events, run N. Terentiev, CMU CSC Synchronization meeting Nov. 16, 2009, CERN

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 2 Introduction Data: run 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 3 Introduction 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 4 Analysis 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 5 Analysis 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 6 Analysis Timing in ME1/1

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 7 Analysis Timing in ME1/2

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 8 Analysis Timing in ME1/3

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 9 Analysis Timing in ME2/1

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 10 Analysis Timing in ME2/2

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 11 Analysis Timing in ME3/1

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 12 Analysis Timing in ME3/2

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 13 Analysis Timing in ME4/1

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 14 Analysis Timing in ME4/2

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 15 Summary Anode timing in Nov splash events (run ) 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 16 Backup Timing in ME1/1 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 17 Backup Timing in ME1/2 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 18 Backup Timing in ME1/3 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 19 Backup Timing in ME2/1 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 20 Backup Timing in ME2/2 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 21 Backup Timing in ME3/1 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 22 Backup Timing in ME3/2 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 23 Backup Timing in ME4/1 (CRAFT 2009 Summer)

N. Terentiev (CMU) CSC Timing meeting Nov. 16, 2009 CERN 24 Backup Timing in ME4/2 (CRAFT 2009 Summer)