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  • Beginning of shift
    • Arrive at NM4 at least five minutes before the start time of your shift.  Take over the status and the plan of the target system from the outgoing shifter.
    • If the Shift Leader is absent, call MCR (3721x3721) and say something like "This is George Tyrebiter (insert your own name) at SpinQuest <YOUR NAME> at SpinQuest (NM4), and we are starting a new shift."  The MCR person will thank you.
    • If the Shift Leader is absent, complete the "Beginning of Shift" form in the ECL elog.
    • Go through the Target Operator Checklist for the beginning and the end of the shift : ← copy this list and add an ECL elog based on those values.
    • Confirm that the "Active Alarm for Target Operator" page is functioning on "uva-nuc-02", as instructed in this page.
  • Every hour
    • Confirm that all computers/programs are running (not got stuck), including the QT HMI screen, the PDP screen, the target computer, the microwave+lifter computer, "uva-nuc-01" and "uva-nuc-02".
  • Middle of shift
    • Day Shift:  Fill the purifier and the magnet shield with LN2 if the LN2 level is low.
    • Check all strip charts and communicate with the Target Expert immediately if you notice anything unusual: especially IVC, LCW flow, LCW pressure, LCW temperature, LCW temperatures on QT compressors
    • Check
  • On-On demand
    • Manipulate the Microwave Control system in case of the "Production" mode.
    • Respond to all target-related alarms, as instructed in this page.
  • End of shift
    • Hand over details to the incoming shifter.
    • If the Shift Leader is absent, complete the "End of Shift" form in the ECL.


In addition to the tasks mentioned (above and below this table), perform the following Routine Maintenance Tasks for Owl/Day/Swing shifts

Owl-Shift
  • Check whether both LHe liquefiers are producing with a rate of ~4 L/hr
  • Check the total consumption rate (Magnet return flow + Separator return flow + Main return flow), and estimate how long the magnet LHe will take to get to 0% (communicate this information on the discord channel via CCP computer)
    You can use this page: Combined Calculators (fnal.gov) or just calculate by-hand.
Day-Shift
  • Fill purifier LN2 space with LN2 → click here
  • Fill Magnrt LN2 space with LN2 → click here
  • Go through the Polarized Target Maintenance Record
  • Check whether both LHe liquefiers are producing with a rate of ~4 L/hr
  • Check the total consumption rate (Magnet return flow + Separator return flow + Main return flow), and estimate how long the magnet LHe will take to get to 0% (communicate this information on the discord channel via CCP computer)
    You can use this page: Combined Calculators (fnal.gov) or just calculate by-hand.
Swing-Shift
  • Check whether both LHe liquefiers are producing with a rate of ~4 L/hr
  • Check the total consumption rate (Magnet return flow + Separator return flow + Main return flow), and estimate how long the magnet LHe will take to get to 0% (communicate this information on the discord channel via CCP computer)
    You can use this page: Combined Calculators (fnal.gov) or just calculate by-hand.
  • Check the total helium amount in the entire system using https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/total_LHe_stat.php, and communicate to the Target Expert if you notice a drop throughout the past 24 hrs.

Target operator Role

The target operator's job is to monitor and maintain the cryogenic system of the polarized target while continuously maximizing polarization of the target whenever possible while beam is on.  The Target Operator should be constantly checking the status of these five critical components of the system:

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