Laser Calibration of EC
There are programs and scripts that control the calibration process. These are chosen based on the LAS_EC configuration and are started as the DAQ goes through the various transitions.
(Note: The status of the beam is irrelevant during EC laser calibrations as far as the data recording is concerned.)
What should happen
As soon as the download is finished the laser and filter are set to their initial configurations. The laser requires a 5-minute warm-up so triggers may not be present immediately. Within 5 minutes the trigger rate should rise to a few hundred events/s and then recede to a few hertz with one final surge to a few hundred Hz at the end. The total run time is about 15 minutes. Initially the trigger is from radioactive sources (300 Hz). This is followed by 6 intensity settings for the laser (10 Hz). At the end a few more source events are recorded (300 Hz). The total number of events should reach about 16k.
Since calibration events are triggered by other than beam related events, the beam can be either on or off during an EC calibration run. (No actual production triggers will be accepted during calibration.)
Should you encounter a problem of any type, please note the problem and send an email email@example.com. You should be able to continue normal production running in any case.
If you did end in an error you can check the following:
on any clonxx window to turn off the EC laser. If the laser is already off the command does nothing. You can view the status using the command
ps -ef | grep unix_master
where xxx is the pid of the unix_master if found.