Docstoc

CMM Status Report

Document Sample
CMM Status Report Powered By Docstoc
					Calibration Status




Rainer Stamen, Norman Gee


                            15 March 2007
    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.


15 March 2007          Rainer Stamen, Norman Gee - Calibration Status           2
                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.




15 March 2007           Rainer Stamen, Norman Gee - Calibration Status             3
           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.


15 March 2007          Rainer Stamen, Norman Gee - Calibration Status              4
                                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.

    15 March 2007        Rainer Stamen, Norman Gee - Calibration Status        5
                       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.




15 March 2007           Rainer Stamen, Norman Gee - Calibration Status          6
                                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).



15 March 2007         Rainer Stamen, Norman Gee - Calibration Status          7
                                     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




15 March 2007          Rainer Stamen, Norman Gee - Calibration Status            8
                        Backup Material




15 March 2007   Rainer Stamen, Norman Gee - Calibration Status   9
                             Comment on Database handling

                                     Trig menu                                         Connectivity
                                       editor                                            editor

                                                                                                                        plots


                                                     Trigger Menu            Connectivity
                                                     IOV                     IOV
                        Module_sim                                                                        View trends
                                                                                                          & results



                                                                Extract




                         Module_
                                                                            Module Settings     Calibration Results      Analysis Results
      Hardware           Services                Current Settings
                                                                            IOV                 Dated                    Dated/Run No/IoV



                                      Calibration
                                      procedure                                         Calibration
                                                                                         checking

                  Readout
                    via
                 ROD / VME                                    Calibration
                                                               analysis
                                                                                                      Algorithmic
                                                                                                       checking


                                                                                                                           CMMDbase170806.cnv


15 March 2007                        Rainer Stamen, Norman Gee - Calibration Status                                                             10

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:6
posted:10/21/2011
language:English
pages:10