Last Update:  01/13/2005 09:41:17 AM   by Nazim Khan

Running Fastbus Pedestals 

Currently, fastbus pedestals are determined with these run types:  low intensity beam triggered runs,  TOF cosmic runs, TOF LED runs without voltage on the LEDs, or internally triggered Fastbus pedestal runs.  The pedestal calculation software can run over any of these run types to determine the Fastbus pedestals.

It is important to do one pedestal run per day.  Furthermore, pedestal runs can only be done with out beam in the machine. The best time to do a pedestal run is right after a beam dump, and the RHIC magnets are ramping down.  Lastly, the silicon will have to be turned off prior to doing a pedestal run.

If you are a TOF expert then to determine the ADC pedestals and to write them to the database, run the FBPedCalc macros.    

    Step by Step

  1. Make sure there is no beam in the ring.
  2. Determine if you have at least 5 minutes.
  3. In the electronics room, check that there is a green light on the top of the gate delay generator in crate C module 10.  If there is not, press the 'trigger' button on the top-left of the module.  The light should turn green.
  4. Using the DAQ GUI, start a run with writing of type "FBPED."  Note: you do NOT need to make any changes to the trigger configuration.
  5. Stop DAQ after at least 10000 events have been collected. It should take about a minute.
  6. Make a note in the logbook that an FBPED run has been taken.