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Calibration Status

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  1. Calibration Status Rainer Stamen, Norman Gee 15 March 2007

  2. Analogue Pulse Shape and Timing – using calibration pulser • FADC DAC scan • Find the DAC value needed to set the chosen FADC pedestal • Pedestal Run • Measure exact FADC pedestal and noise. DAC scan only sets pedestal to 3-4 FADC counts • Coarse Timing Scan • Measure DAQ readout memory offset • Fine Timing Scan • Measure fine timing. May change coarse timing setting • Analogue Pulse Shape • Measure analogue pulse shapes • Status: All now store results in COOL database; runs are ~automatic; but the information is not yet used in module services to set up hardware. Rainer Stamen, Norman Gee - Calibration Status

  3. FIR Filter and “Electronics ET Calibration” • FIR Filter coefficients • Compute the coefficients and “drop bits” settings for each trigger tower. • Assume we are using matched filter. Aim for best resolution. • Electronics ET Calibration • Compute receiver and LUT values to reproduce simulated ET deposits • All these results should go to database in a “Pulser” settings area. • Status: Not started. Not hard. BUT requires combined running with calorimeters which we have not developed – see foil 6. Rainer Stamen, Norman Gee - Calibration Status

  4. Detector Performance and Beam Corrections • Physics Pulse Delay • Latency L1A to analogue pulse is not the same as calibration system • Will need different software to find coarse & fine timing. • Physics Pulse Shape • Particle pulses not identical in shape to charge injection systems. • Measure particle pulse shapes – not so easy as amplitudes are varying and usually small, and can have pulses in adjacent timing bins. • Then convert to FIR coefficients. Initially adjust ET calibration to keep same area under pulse per GeV? • Correction factors: • dead material. One multiplicative factor per tower, from Monte Carlo? • dead cells. One factor per tower, probably just eta and layer dependent • Status: all of these not started. Rainer Stamen, Norman Gee - Calibration Status

  5. Analogue Checks • These can all be done with the same L1Calo run mechanisms, but need different calorimeter conditions and/or different data analysis • Connectivity – verify the routing of calorimeter towers to PPMs • Crosstalk – check no significant communication between towers. • Relative timing of raw cells – check that they are equal for a tower • Pulse shapes from raw cells – check they are very similar • Pulse amplitudes from raw cells – check injected energies contribute equally • Match precision readout to tower readout – beginning of physics calibration • Status: • Connectivity is started. Needs PPMs (coming very soon). Tilecal has generated the patterns we need. More discussions needed with LAr. • Other areas not studied. Needs extra calculations on data from the analogue pulse shape runs, and a few similar types of run. Rainer Stamen, Norman Gee - Calibration Status

  6. Interface with Calorimeters • Most of the runs rely on calibration signals from calorimeters • Electronic calibration (ET in trigger matching injected pulses) • Also various data patterns are needed to verify crosstalk, signal addition • Calorimeters are capable (willing!!) to generate patterns • We also need access to the trigger cables… • Need to work on combined runs with calorimeters • Need extra hardware (LTPI) to share triggers, plus software setup & tests, plus software to analyse and present large numbers of results and trends • Status: No actual development yet. Useful discussions with Calo groups, but no tests. Needs some effort which we are pretty short of. Rainer Stamen, Norman Gee - Calibration Status

  7. Digital Timing • Automatic procedures to set up digital timing: • PPM LVDS into CPM & JEM. • CPM and JEM clock alignment with CAM; CMM & JEM FIO alignment. • CPM-CMM; JEM-CMM; CMM-CMM; CPM, JEM & CMM G-Link pointers. • Overall system timing alignment. • Results to go to database. • Module services to use values from database. • Status: Procedures within single crates mostly exist, but results do not go into database (except PPM). No CAM runs yet. • Timing between crates (LVDS, CMM) and overall optimisation not yet done? Multi-step runs not viable, so use kicker-style (CMM needs updating). Rainer Stamen, Norman Gee - Calibration Status

  8. Summary • Analogue pulser measurements just need more channels and cables • Electronics ET calibration not started but not hard • Beam pulses (timing, shape) and correction fro dead material need significant work. • Detailed checks of analogue cabling and signal uniformity not done yet • but can be done mostly with data stored by calibration pulser runs • Interface with calorimeters coming – but slowly. • Can be developed in parallel with collecting calib pulser data by hand. • Digital Timing needs completing Rainer Stamen, Norman Gee - Calibration Status

  9. Backup Material Rainer Stamen, Norman Gee - Calibration Status

  10. Comment on Database handling Rainer Stamen, Norman Gee - Calibration Status