[time-nuts] So what’s inside that Cs Beam Tube anyway?

Tom Van Baak tvb at LeapSecond.com
Mon Oct 31 18:44:41 EDT 2016

More eye candy for the cesium nuts -- the center of a cesium beam tube is the large copper Ramsey microwave cavity. Each generation of cesium standard uses a different design. The 5 specimens seen here came from Corby Dawson, who's probably hacked open more Cs tubes than all of us put together.



So, Skip, if you have the time, break open another dead tube and keep removing layers until you expose the copper cavity itself. 


The first commercial cesium standard was the Atomichron, made by the National Company in the late 50's. It's 10x larger than a 5061A. Some photos here, including visible parts of the monster beam tube:


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