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- Turn ON the "Power Control" switch of the Annealing Plate Control Box, and turn it OFF when the top-section pressure of the roots pump reaches 10 Torr.
- Never leave the switch ON longer than required in this and later steps.
- You had better keep your finger on the switch, not to forget turning it OFF.
- Confirm that the main return flow increases to 100-150 SLM. If it is higher/lower, find any difference in the conditions.
- Turn ON the "Power Control" switch, and turn it OFF when the top-section pressure reaches 16 Torr.
- Confirm that the main return flow increases to 150-250 SLM. If it is higher/lower, find any difference in the conditions.
- Wait until the top-section pressure decreases to 8 Torr (or below).
- Repeat steps 3-5 until the nose LHe level becomes ~80%.x
- If you need consume LHe in the magnet, fill the fridge from the magnet.
Change the separator flow to
25 SLM.
- If the separator flow was 7 SLM, you might wait for 0.5-1.5 hours
- .
- Change the separator flow to 25 SLM.
- To be optimized.
- Open the fridge bypass valve at
- 3.0 turns. Confirm that the fridge return flow goes up
- Open the bypass valve at 3.0 turns.
- Change the separator flow to 30
- to ~100 SLM.
Wait until the Ann-Plate Top resistor goes up to 1400 Ohm, which indicates that the liquid started accumulating. It usually takes 30 minutes from step #3. If it takes longer than 40 minutes, search for unexpected conditions.
- 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. It usually takes 10 minutes from the previous step.
- Monitor the LHe level probe and the chip resistors to confirm that LHe is being transferred normally.
- Close the fridge bypass valve (i.e. set it at 0 turns) when
- the Heat-Ex Top resistor goes up to
Close the bypass valve.
- Usually the software interlock sets it at 0.5 turns automatically. Anyway you set it at 0.0 turns manually
- ~1400 Ohm.
- Change the separator flow to 20 SLM.
Repeat steps 1-7 until the fridge and/or magnet levels reaches what you need.
- Change the separator flow to 7 SLM.
- Change the setting opening of the gate-valve bypass as follows:
- The set point for the auto control is 40 Torr.
- The auto control is enabled.