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2010 Cold head swap:
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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.


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The blue aluminum plate is needed to keep the lifting cables away from delicate bits on the top of the instrument.


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We use a block of lightweight climbing rescue pulleys to lift the magnetometer so we could access the cold head.


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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.


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Joe trying to remember which bolts we are suppose to loosen.


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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.


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Here is how we attached the webbing to the top of the dewar.


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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.


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Scott Bogue    email: bogue[at]oxy[dot]edu