[time-nuts] Cheap Rubidium (heatpipe cooling for)
Magnus Danielson
magnus at rubidium.dyndns.org
Thu Dec 24 22:42:38 UTC 2009
Hal Murray wrote:
>> A heat pipe might work if the fluid had a sufficiently low boiling
>> point. The rubidium isn't terribly tolerant of high temperatures, and
>> I'm going to pick up some heat rise as I put it inside some baffles /
>> shields. You need to find something that fits a fairly narrow window.
>
> This is all backwards.
>
> The main reason the typical Rubidium box needs a serious heat sink is that
> there is an active heater inside it heating up the lamp to get it up to
> operating temperature. That part of the system better be "tolerant" of high
> (enough) temperature.
... or a less heat-producing alternative could be used. The
Rubidium-lamp produces two wavelengths of which one is filtered by a
Rubidium-filter which leaves the final pumping wavelength. This is what
a laser diode could supply instead.
> Maybe things would be a lot better/simpler if the heating/cooling we have
> been discussing were split into two sections. One for the lamp assembly, and
> a second for the electronics.
Most of the discussion has been on thermal isolation of the entier
units. Not what needs generates temperature and what requires
temperature stability etc.
> Anybody know what the thermal coefficient of the lamp is relative to the
> electronics?
I am not sure I know what you mean by this...
Cheers,
Magnus
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