[time-nuts] Cheap Rubidium (heatpipe cooling for)

[J. Forster]

That's why I've been suggesting active control with TE devices.

You can buy a small TE cooler at Walgreens for about $20. It's big enough
for a 6-pack of Coke cans and already comes in an insulated box. Add a
simple temperature control in series w/ the DC supply and you should be
well on the way.

-John

=================


> Hi
>
> The original intent was to simply take an existing "cheap" rubidium and do
> simple things to it. Tearing it into pieces and redesigning parts of it
> was not anything I originally contemplated. The tight integration of the
> physics package to the electronics would make this a fairly involved
> process.
>
> Bob
>
>
> On Dec 24, 2009, at 5:42 PM, Magnus Danielson wrote:
>
>> 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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>
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