Before entering the cleanroom, one shouldcheck the status of the liquid nitrogen(LN). From the service corridor, check to see if there is any LN in the cooling chamber - seen by a flow of nitrogen "steam" coming from the LN filling tube at the top of the evaporation chamber or a cap of frost forming around it. If there is none, and there have been no other users for a day or more, then you must fill a canister of LN from the storage tank in the measurement lab - 2/3 of a canister is usually plenty.
(*) and screw it onto the sample stage, making sure the two alignment pins are securely in place. Bring the transfer rod, slowly, all the way back to the evaporation chamber and close the chamber valve. The door will make a very audible sound as it closes. Open the turbo valve and switch the pressure monitor to the evaporation chamber.