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Next make sure all the necessary control screens are up. You should have PDP, the Cryo Controls, strip charts, and the alarm handler accessible.
Maintain Polarization
The polarization should be your constant worry. Even once you've found a A good microwave frequency for the material , be vigilant! This frequency will change as the sample material acquires dose!
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. Thus the target operator is required to pay constant attention to the time evolution of the polarization and the microwave frequency
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NMR
- The NMR system is how we monitor the polarization. Read the PDP overview for a tour of the software we use for NMR.
- "Take Data" to run the NMR, and hit "DC Convert" when you need to recenter the signal.
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The output frequency of the microwave is automatically controlled by the microwave VI. It takes the real-time polarization data recorded by the PDP via "Data input file".
Call the target expert if
- The microwave VI shows any error, which is usually marked with red color.
The polarization is going down continuously for longer than 5 minutes.
| User Interface of Microwave VI | Example of Polarization vs Time |
|---|---|
|  |
Maintain Cryogens
The cryogens are maintained by automatic PID loops. Your job is generally to monitor these loops and step in if they fail.
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