[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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