[time-nuts] CS reservoir depletion

paul swed paulswedb at gmail.com
Thu Jan 13 12:59:25 UTC 2011

Really interesting thread. About a year ago on this thread the same
discussion occurred.
Several thoughts along these lines and frankly I know little accept for what
I read here and online.
I would agree the CS never runs out. Accept for one minor point. We tend to
get these things way beyond HPs end dates by many years. So is it really
This threads a bit different then the last one. The last one described
opening the internals and various effects from trying to refill the kettle.
This would be the first insight that I have in the fact that the systems
polluted perhaps.

On Thu, Jan 13, 2011 at 7:31 AM, Chuck Harris <cfharris at erols.com> wrote:

> I suppose that would be possible if a C beam standard worked like a
> rubidium
> reference, but alas, they are different in virtually all respects.
> Think of the C beam as having a small kettle full of cesium that is put
> on a low simmer.  The kettle keeps the cesium molten, and bubbling up
> minute
> amounts of cesium vapor.
> How are you going to refill the kettle when it lives in the middle of
> a hard vacuum chamber?  The best you could do with your technique (assuming
> it is even possible) is to coat the walls of the vacuum chamber with
> cesium...
> Kind of like trying to fill the gas tank by hosing the car down with
> gasoline.
> Besides, if HP can be believed, the kettle never runs out of cesium before
> the receiving end of the tube gets completely choked on waste cesium metal.
> That waste cesium needs to be removed, and the electron multiplier needs to
> be restored, at a minimum.... and the ion pump is probably full up too.
> -Chuck Harris
> Neville Michie wrote:
>> It may not be necessary to open a tube to renew the supply of an alkali
>> metal.
>> I remember an experiment where an incandescent light bulb was dipped
>> into molten sodium chloride in an iron vessel.
>> The filament was run and a voltage between the filament and the iron
>> vessel caused sodium ions to migrate through the glass
>> into the bulb. Sodium accumulated in the bulb.
>> It is obviously a slow process, but then you did not need to put much Cs
>> in the bulb.
>> Why not use it to recharge an alkali metal lamp?
>> cheers, Neville Michie
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