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

[Bruce Griffiths]

See:
http://www.walgreens.com/store/catalog/Accessories/Kool-Kaddy-12V-Cooler/ID=prod1833617&navCount=0&navAction=push-product 
<http://www.walgreens.com/store/catalog/Accessories/Kool-Kaddy-12V-Cooler/ID=prod1833617&navCount=0&navAction=push-product>

located using search term:
cooler

using the search term
thermoelectric
is even better

Bruce

Richard W. Solomon wrote:
> Can you be a little more specific about the cooler ? Walgreens
> search function is rather laborious and clumsy.
>
> Tnx, Dick, W1KSZ
>
>
> -----Original Message-----
>    
>> From: "J. Forster"<jfor at quik.com>
>> Sent: Dec 24, 2009 6:58 PM
>> To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
>> Subject: Re: [time-nuts] Cheap Rubidium (heatpipe cooling for)
>>
>> 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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>>
>>
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