[time-nuts] You can build a fountain from the things you find at home...
Bruce Griffiths
bruce.griffiths at xtra.co.nz
Tue Sep 27 20:14:46 UTC 2011
Poul-Henning Kamp wrote:
> In message<CAF_SE-DK+1h1T2xks1u19Ty7nSmXrtQD+zV_2WbS0NJm1ey4cA at mail.gmail.com>
> , Robert Darlington writes:
>
>
>> So I find that somewhat surprising (Aluminum as a material for UHV systems)
>> because they outgas water -for months. Anodized aluminum is especially
>> bad! Did they make any suggestions on cleaning the oxide off before pumping
>> down and baking?
>>
> No mention was made thereof.
>
> With good getters I'm not sure the water would be a problem.
>
>
UHV operation isnt required, even the PTB fountain only has a background
pressure of 5E-7Pa.
http://www.congrex.nl/EFTF_Proceedings/Papers/Session_2_Cold_Atom_Clocks/02_02_Gerginov.pdf
operation with somewhat higher background pressures (with increased
pressure shift uncertainty) should be possible.
Bruce.
More information about the Time-nuts_lists.febo.com
mailing list