Evacuate 1K Pot

Now you are going to pump on the 1 K pot, as you did before the LN2 transfer.

1. Make sure the Speedivalve connected to the He recovery line and the 1 K pot needle valve are closed (should have already been closed from previous steps, but a check nonetheless).
2. Make sure He gas supply is off.
3. Turn on He4 pump.
4. Open V5A, V2A, V4A (this pumps out leftover He gas in tubings before we pump out 1K pot line). Wait for P2 to below 0.1 mbar.
5. Fully open 1 K pot Speedivalve and then close it. If you watch P2, the pressure should rise a bit and then lower. You've evacuated the 1 K pot now. .
6. Close V5A, V2A, V4A.