MuTr Calibration DAQ Procedure

• These "special" runs should be taken when we are not taking data for a good beam store, there is no run with the "Big partition" going, and in consultation with the shift leader (if any).
  • Other non-MUTR standalone runs can be going on simultaneously
  • MuTr HV should be off or at standby if there is beam !
  • The Magnets must be ON!
• log into phnxrc account on phoncsa (or phoncsb or c); use a fresh window
  • Open a terminal and type : ssh phnxrc@phoncsc
  • Go to the working directory : cd mutr/calib
  • type "docalib.pl &" to start the muTr calibration GUI
  • punch the "South" button to start a South calibration
  • start a second GUI as above for the "North" arm and punch the "North" button
  • Calibration data taking for south and north should to be run at the same time.
  • When each is finished use the EXIT button on the GUI to exit.
  • (a quicker way to launch the muTr calibration GUI's is to the use the calibration button on the oncsTools GUI and then the MUTR.S and MUTR.N buttons on the calibration GUI. Then skip to 4th bullit below.)
• each should finish in about 20 minutes and progress can be tracked via the GUI progress bar
  • you will also see short messages in the original window from which the GUI was run reporting the progress and how many events were obtained for each run.
  • each DAC setting run stops after 120 or more collected events. The procedure will try up to 3 times at each DAC setting to obtain this many events. If you see it getting only 8 events per run repeatedly than the DAQ is not working and you will need to debug it using standalone run control.
  • you can clean up after a failed calibration by typing "kill.pl S" or "kill.pl N" for South and North respectively. Then make sure that rc -standalone works and try again.
  • a normal calibration run involves one series of runs for each arm with 13 different DAC settings (13 * 4 prdf files should be taken per arm.
• A fast pedestal-only calibration that takes only 5 minutes to run can also be used when time is limited.
  • To use this fast calibration, type "doped.pl &" instead of docalib.pl to start the GUI.
  • The whole process, including updating the DAQ threshold values, should only take about 10 minutes (compared to presently over 30 minutes for the full calibration).
• Data will be automatically analyzed with DAQ thresholds and the database being updated and results appearing on the web.
  • at http://www.phenix.bnl.gov/WWW/publish/phnxmutr/calib_results/calib_results.html (takes up to 30 minutes, new directory with the current date should appear in ~phnxmutr/calib/. In that subdirectory, view output.txt to check completion.)
  • Status links at the top of the page will contain a list of averages if all went ok, or an error message if not. The changes of the pedestals, gains and rms values wrt the previous calibration are shown in the last 3 columns - they should be small, if not consult a muTr expert.
  • Plots of pedestals and rms values vs time are shown on clickable pictures on the main calibration results web page. Here you can see whether large changes for the most recent calibration have occured wrt the the norm. E.g. a large increase in average rms noise can signal a FEM problem that needs expert attention.
  • If results do not appear on the web the samba mount may be down. It can be refreshed by logging into phnxmutr@va078 and checking that the mount to the phenix disks at RCF is good, by 'cd calib' and 'remount_samba' and give the phoncs password if it finds it needs to remount and asks you for a password.

• Picutres of calibration GUI at the begining, in progress and after finishing.

More detailed information:

• Automtic DAQ and Analysis procedure explained.