This page provides all the information that you need to be a SpinQuest Target Operator. The section below provides the link to the training required to complete before you can take shifts as a Target Operator. You need both FNAL training to be able to access NM4/NM3 and you need Target Operator Training and Target Operator Practical to be able to know what to do on your shift. Also listed below is a list of qualified Target Experts and Target Operators. Make sure your name is on the list of Target Operators before you show up for a shift.
TO Required Training
General NM4 Access Requirement
Qualified Target Personnel
Shift Duties (Draft)
- 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 (3721) and say something like "This is George Tyrebiter (insert your own name) at SpinQuest 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.
- 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.
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:
A.) Is the Internal Vacuum Chamber (IVC) good and at pressure below 10-6 Torr (spikes above 10-5 Torr for a few seconds during filling are OK, but if it takes longer than a few minutes to come backdown, call the Target Expert.
B.) Is the Liquefier producing normally without any alarms (RED lights indicating alarms on the QT screen) and are the cold head compressors all running (green light).
C.) Is there any sign of a target magnet quench. Know if the magnet is ramped up. If it is and at some point you see the magnet pressure shoot up to 9 psi in a few seconds, call the Target Expert immediately. The magnet control VI will also indicate a quench.
D.) What the LCW temperature. If
E.) Power Outages can be very hard for the cryogenic system to recover from. If you have an outage or even a power flicker, let the Target Expert know.
The Target Operator must know how to monitor the system, move the target position, control and optimize the microwaves, Take an NMR Thermal Equilibrium Measurement (TE), perform the necessary cryogenic fills, respond to any system alarms, and log everything.
Target Operator (TO) tasks during Shift
Additional there are three main modes that the target system can be in. Idle mode is without any liquid helium in the nose and the only goal is to conserve liquid over some time period. Hold Cold Mode also has the goal of reducing liquid helium consumption as much as possible but to also keep the target material in the fridge below 100K. Production Mode is the normal mode we want to be in when the beam is on and we are taking data. You should know how to switch between these modes and how to sustain them.
Production Mode
Switching Between Modes
1. Transitioning from the Hold mode to the Production Mode
2. Transitioning from the Production Mode to the Hold Mode
Note: Please coordinate with the Target Expert on shift if there is a transition from one mode to another.