S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 Critical Data Errors S. Durkin The Ohio State University USCMS EMU Meeting, FNAL, Oct. 20, 2005

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 Data Errors – A History Data Errors in 2004 Test Beam were the Dominant Problem DQM Crashes, DDU reports critical errors How healthy is the electronics? DMB-TMB LCT time delay missing Impossible to time in DAQ (Experts: don’t worry!) September 2005 Slice Test full Peripheral crate of production TMB, DMB, CCP, MPC FED crate with production DDU/DCC missing new Crate Controller, Final LV supplies DMB block recycle increased to accommodate large Latency DMB-TMB LCT delay kludged in DMB firmware UCLA must be added permanently to TMB firmware

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 Additional problems uncovered in Sept05 Slice Test CFEB L1A# ambiguous in overlap events (2 events/block) word count overflow for ALCT time bin data (header size too small) gigabit driver memory ring wrap around Vindication  1 million event error-free runs! Data Errors – Gone!

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 Preliminary Slice Test Track Fitting S. Durkin Sept. 8, 2005 Analyze RunNum1007Evs0to49999.bin using /AnalysisUtilities look for tracks in two separate CSC’s trigger very loose, 9291/50000 such events found single overall cross talk and noise constants used events typically very well fit (see next two pages) analyze data with CSC5 and CSC9 hit. CSCID Chamber Type 4 ME2/1 16 no data 5 ME2/ ME2/ ME3/1 16 no data 9 ME3/ ME3/2 32 CSCID1 CSCID2 Events Red Events chamber overlap.

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 ************ Event ID 38 CSC ID 5 CSC type 0 Cathode Tracking: Number of Tracks 1 Track 0 Plane 0 Hits 0 y dy dif used Plane 1 Hits 0 y dy dif used Plane 2 Hits 0 y dy dif used Plane 3 Hits 0 y dy dif used Plane 4 Hits 1 y dy dif used Plane 5 Hits 0 y dy dif used Cathode Track Fit (4 DOF) for track 0: Slope Intercept Chisqr Typical Track – Evt 38 CSCID 5 (Near Side) Distance from track in Strips. Typically < 200  m

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 ************ Event ID 38 CSC ID 9 CSC type 0 Cathode Tracking: Number of Tracks 1 Track 0 Plane 0 Hits 0 y dy dif used Plane 1 Hits 0 y dy dif not used Plane 2 Hits 0 y dy dif used Plane 3 Hits 0 y dy dif used Plane 4 Hits 0 y dy dif used Plane 5 Hits 0 y dy dif used Cathode Track Fit (4 DOF) for track 0: Slope Intercept Chisqr Typical Track – Evt 38 CSCID 9 Far Side

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 Cathode Strip Angle Matching Black Curve – CSC5  Red Curve – (CSC5  minus CSC9  ) Compare track angles Ignore any geometry corrections CSC9  (degrees) CSC5  (degrees) Number of Events  (degrees)  ~ 4 degrees

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 Cathode Strip Intercept Matching Extrapolate track intercept Ignore any geometry corrections except for Z position Note: CSC5 and CSC9 are back to back (mirror images) CSC5 plus CSC9 Intercept (strips) CSC5  Slope Black Curve – CSC5 Intercept Red Curve – CSC5 and CSC9 Corrected Intercept difference Number of Events Intercept (strips)  ~ 2.5 strips Best Fit Distance Between Chambers 101cm

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 Anode Wire Angle and Intercept Matching Anode tracks (units of wire groups) Ignore any geometry corrections except for Z position CSC9  (degrees) CSC5  (degrees) CSC5 minus CSC9 Intercept (wire group) CSC5 Slope

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 Cathode Strip Expected Resolution covariance matrix from the least-squares fits to the track can be used to estimate angular error and extrapolation error using PDG notation from the data- angular error 0.15 degrees extrapolated position 0.6 strips Multiple Scattering Dominates from the particle data group it is easy to calculate

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 Real Time DDU Monitoring DDU/DCC Monitoring Controls Detector Resets Run Control: 1) reset initializes electronics 2) start DDU monitoring 3) take data Continuously read DDU status register Software Reset of Emu System on error (approx 200  sec) FMM Reset from computer write to VME register Firmware Real-time resets also possible (approx 30  sec) Spy Data DQM Superfluous, Monitoring done “real time” DDU traps ALL critical errors in  sec and requests FMM reset

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 DDU Error Checking

S. Durkin, USCMS-EMU Meeting, Oct. 21, million events  16 Gb ~ 16 seconds LHC running LHC DDU/DCC Occupancy How well have we checked “real time” error detection?

S. Durkin, USCMS-EMU Meeting, Oct. 21, 2005 Conclusion – Need More Data Slice Test: 112K events(1 LHC sec) takes a 5 minutes run. 112:1 30 days running yields 6.4 LHC Hours Data taking should be left on 24/7. Shifts are not necessary. No additional risks. To Reset or Not to Reset: Rare Hardware failures have to be understood.