[time-nuts] Variable Conductance Heat Pipes for temperature control

[Joe Gwinn]

At 7:31 PM +0000 1/23/10, time-nuts-request at febo.com wrote:
>Date: Sat, 23 Jan 2010 14:31:40 -0500
>From: Bob Camp <lists at cq.nu>
>Subject: Re: [time-nuts] Variable Conductance Heat Pipes for
>	temperature control
>To: Discussion of precise time and frequency measurement
>	<time-nuts at febo.com>
>Message-ID: <08528FE8-4EEC-4A8B-AF68-FE045D227AD0 at cq.nu>
>Content-Type: text/plain; charset=us-ascii
>
>Hi
>
>After a quick read, I still don't see much on just how good the 
>thermal control can get. Of course I could have missed that page ...

The performance of the Rb oscillator VCHP heatsink is in the book I 
left at work.  It was pretty good, especially considering that the 
heatsink system is wholly passive and electronics-free.

Joe


>Bob
>
>
>On Jan 23, 2010, at 1:33 PM, Joe Gwinn wrote:
>
>  > Back in December 2009 I proposed (in "Re: [time-nuts] Cheap 
>Rubidium (heatpipe cooling for)") use of heat pipes to stabilize the 
>temperature of a Rubidium oscillator within an insulated box. 
>Turns out I was anticipated by ~40 years.
>>
>>  While standard heat pipes offer near isothermality , they don't 
>>offer temperature constancy as the heat flow and/or condenser 
>>temperature vary.  However, there are hints in the literature that 
>>near constant temperature can be achieved, complete with pictures 
>>of a Thermacore International product used to control the 
>>temperature of a Rb oscillator used in a cell phone tower or the 
>>like.
>  >
[snip]