[time-nuts] CS reservoir depletion

[Neville Michie]

It sounds like you need to dip a corner of the device in liquid nitrogen
and allow the metal to evaporate and condense in the cold corner.
Or is it sublimation.
I do not know how long it would take.
cheers, Neville Michie




On 13/01/2011, at 11:31 PM, Chuck Harris 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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