2010 Cold head swap:
In April 2010, Joe Kirshvink and I replaced the cold-head piston that plugs into the base of the cryogenic magnetometer. Step 1 was to procure some UHP helium (in the blue bottle) and get the automatic sample handler tray (left of the blue bottle) off the top of instrument.
The blue aluminum plate is needed to keep the lifting cables away from delicate bits on the top of the instrument.
We use a block of lightweight climbing rescue pulleys to lift the magnetometer so we could access the cold head.
We placed some left over scraps from construction of the shielded room across the hole in the ceiling and attached the upper end of the pulley block.
Joe trying to remember which bolts we are suppose to loosen.
To get the liquid helium dewar into the room, we hoist it up onto a wheeled cabinet. The plywood assembly to the left of the dewar is a loading dock we place over the steps at the entry to the shielded room.
Here is how we attached the webbing to the top of the dewar.
After lifting the dewar onto cabinet, we wheeled it over to the removable loading dock and are all set to wheel it into the room for the cool-down. Joe Kirschvink for scale.