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Cryo-Procedures

The MicroBooNE cryo system is maintained by our dedicated cryo team, who perform their own monitoring simultaneous to the shifter's (through IFIX). Full documentation of which alarms are critical & how the cryo team are notified is provided in DocDB 12815 (https://microboone-docdb.fnal.gov/cgi-bin/private/ShowDocument?docid=12815 ) In general there should be very few occasions where a shifter has to contact the cryo experts - usually all cryo problems will be handled directly between the cryo experts and the runco.

If you see a cryo error:

Check that the alarm also appears in IFIX

  • If it does not, then this is most likely a monitoring problem rather than a genuine cryo problem - contact the Slow Controls expert to find out more.
  • If the alarm reads "keytree incomplete", this is the alarm that indicates that keys have been removed from the LArTF keytree (i.e. someone is making an access); it needs to be manually acknowledged after accesses are completed (after which it should clear itself). If you see this alarm without receiving a call from anyone making an access, contact the runco immediately.

If IFIX is also showing an alarm

  • Contact the runco with the details. The runco will contact the cryo team if appropriate.
  • If IFIX and slow controls are both showing an alarm and the runcos cannot be reached, contact the cryo team.