[time-nuts] C-Beam Usage
Chuck Harris
cfharris at erols.com
Fri Jan 14 08:54:18 EST 2005
The photocell (photomultiplier really) should last forever if it is
kept "dark", and in a vacuum. Discrete P-M tubes tolerate storage quite
well.
I believe that the traditional cause for C-beam tubes to fail in storage is
degradation of vacuum. These new tubes are unbelievably clean inside, and have
as near to perfect seals as is possible. I was absolutely amazed to find
my tube had made it through 10 years of careless storage with a good hard
vacuum. I suspect that mine is not unique in this regard.
-Chuck
Poul-Henning Kamp wrote:
>
> I don't know if turning off the Cs oven also turns off the photocell,
> but you certainly do not use up your precious cesium when it is frozen
> solid.
>
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