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- Change the separator flow to 20 SLM (from 7 SLM usually). See this page for instructions → How to control the Separator Return flow
- Wait for ~30 mins.
- Fully open the gate-valve bypass (See → How to control the Fridge Return flow (GV and GV Bypass)):
- Open Run-valve to 3 turns (see How to Open or Close Fridge Valves)
- Wait until the Ann-Plate Top resistor goes up to 1400 Ohm, which indicates that the liquid started accumulating.
- Wait until the nose LHe level reaches 100%. It usually takes 15 minutes from the previous step.
- Wait until the Heat-Ex Bottom resistor goes down from 1400 Ohm and then up
- Fully, close the run-valve (see How to Open or Close Fridge Valves)
- Change the setting of the gate-valve bypass as follows (See → How to control the Fridge Return flow (GV and GV Bypass)):
- The set point for the auto control is 600 Torr.
Note: if you are setting this at the end of a production run, and want to take data for polarization decay constant (T1), then use 23 Torr instead. Check with the Target Expert regarding this, otherwise use 600 Torr. - Ensure, the auto control on the pressure PID of the GV-Bypass VI The auto control is enabled.
- The set point for the auto control is 600 Torr.
10. Set the separator flow to 10slm.
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