[time-nuts] Zeeman frequency oddness

Tom Van Baak (lab) tvb at leapsecond.com
Sun Oct 28 10:25:17 EDT 2012


Cs tube ADEV is related to S/N ratio which is dependent on beam flux (the formula is in any quantum physics textbook).To achieve higher beam currents high-perf tubes run the oven at a higher temp (which is why their lifetime is much shorter).

So yes the RF chain is the same. But the oven controller set point is different and the E/M may be configured differently to accommodate the higher signal levels. 

/tvb (iPhone4)

On Oct 27, 2012, at 8:07 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> On 10/28/2012 01:13 AM, Chuck Harris wrote:
>> Two things come to mind:
>> 
>> 1) is this the high performance tube? Perhaps it has a different
>> Zeeman frequency than the standard tube?
>> 2) a non HP replacement tube? FTS Cs beam tubes are way different
>> Zeeman frequencies than HP.
> 
> A high performance tube should give you better signal to noise.
> 
> A non HP tube might give you a somewhat different C-field setting for same center lock-in.
> 
> The physics of Cs-133 is still the same, and the RF-chain is still the same. If not, someone has to teach me something new, or at least inform me why the high performance tubes are so much different.
> 
> Cheers,
> Magnus
> 
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