[time-nuts] H-Maser drift (was: Why discipline Rubidium oscillator?)

EWKehren at aol.com EWKehren at aol.com
Tue Nov 21 10:18:14 EST 2017

Corby can most likely answer some of these questions, since he also has a  
maser and does maintain it. He is right now most likely still asleep, 
California  time.
Bert Kehren
In a message dated 11/21/2017 9:25:30 A.M. Eastern Standard Time,  
attila at kinali.ch writes:

On Tue,  21 Nov 2017 15:14:59 +0100
Ole Petter Ronningen  <opronningen at gmail.com> wrote:

> > [...] The advantage of  the platinum valve
> > system is that it "generates" single atom  Hydrogen, as required
> > by the maser.
> Picking nits  here.. It was my understanding that the splitting of 
>  hydrogen into atomic hydrogen happens using RF in the dissociator - not  
> the platinum leak valve. Is my understanding incorrect?

Good  question. I don't know. I've only read a dozen or so papers on
maser  construction. I have never owned or operated one. Much less
taken appart  and studied its construction.

> > Within the cavity there is a  small glass bulb that keeps the atoms
> > in the right position of  the cavity field.
> 4.5 liters in EFOS type masers - so not  *that* small. I believe other
> masers are the same order of  magnitude.

Hehe.. Yes. It's "small" compared to the cavity. Depending  on the
exact cavity construction, the storage space can be as small as
a  tenth of the total cavity volume.

Attila Kinali

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the prosperity and technological  sophistication in the world is of no 
use without that  foundation.
-- Miss Matheson, The Diamond Age, Neil  Stephenson
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