In message <dbb70463b9d04f6589fbf97b2e4be...@vectron.com>, "Bob Camp" writes:

>Conventional gas cells have a finite lifetime on the
>lamp.

It used to be that Rb's would fail lock because the bulb dimmed from Rb
absorption into the glass, but I think they got that fixed with a teflon
coating.

Thes days most of them ultimately fail from the high operating temperature,
through a variety of mechanisms.

For the CSAC, my bet would be that the laser is the limiting factor.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
p...@freebsd.org         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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