[time-nuts] Mercury Ion Clock

[Magnus Danielson]

Paul,

You mean, as all time-nuts already have redundant sites with at least 4 
5071As with high-performance tubes, redundant cesium and rubidium 
fointains, set of active hydrogen masers, with everything in tight 
temperature, humidity and pressure control, UPS and diesel-engines, 
GPS/GLONASS/GALILEO receiver on temperature-stabilized piller and 
antenna, do TWSTFT to major labs... since money is no issue, right?

The main problem with cesium tubes as I recall it is really the ionizer 
in the mass-spectrometer being poluted with cesium, this then creates 
bad S/N before running out of cesium in the oven.

Yes, I agree it would be a great clock to have, but practical limits in 
cost is a challenge for most, so it would be interesting to look at it 
and ask how cheap it could be done.

Cheers,
Magnus

On 11/01/2014 03:21 PM, paul swed wrote:
> Magnus,
> But for a time-nut how can price even enter into the conversation? Plus it
> only draws 10s of watts. A green super duper clock. Other comment I read is
> that there is no part that will wear out. Granted I suspect over many years
> something happens, but its not the typical CS depletion. I might speculate
> the glass windows fog or something or on earth the evacuated chamber
> ultimately leaks or the metal in the vacuum release stuff.
> No idea but pretty sure I won't be putting a watch on ebay any time soon.
> Regards
> Paul
> WB8TSL
>
> On Sat, Nov 1, 2014 at 6:42 AM, Magnus Danielson <magnus at rubidium.dyndns.org
>> wrote:
>
>> Hi Bob,
>>
>> The traditional Hg ion clock with it's 40,5 GHz frequency is doable, but
>> it would be interesting if it could be commercialized at a (time-nuts)
>> friendly price.
>>
>> The modern optical clock got much easier to work with when the frequency
>> comb was invented. The frequency comb and stable lasers is now
>> commercialized, but not cheap, not cheap at all.
>>
>> Cheers,
>> Magnus
>>
>>
>> On 11/01/2014 02:27 AM, Bob Camp wrote:
>>
>>> Hi
>>>
>>> Trapped ion clocks have been the “obvious successor” to a Cs tube for at
>>> least 30 years. There is a *lot* of very fancy work involved in getting
>>> from 10 MHz up to a very specific light wavelength with low ADEV and good
>>> phase noise…..
>>>
>>> Rocket science indeed. Time Nuts rocket science, but tough to do none the
>>> less.
>>>
>>> Bob
>>>
>>>   On Oct 31, 2014, at 8:09 PM, paul swed <paulswedb at gmail.com> wrote:
>>>>
>>>> Humor aside. I did dig deeper. It seems that this technology could be
>>>> commercialized in larger volumes and might land in the same cost as a
>>>> good
>>>> CS does today. Technically it looks reasonable.
>>>> Regards
>>>> Paul
>>>> WB8TSL
>>>>
>>>> On Fri, Oct 31, 2014 at 1:45 PM, paul swed <paulswedb at gmail.com> wrote:
>>>>
>>>>   Jim
>>>>> I am sorry to say thats the wrong clock picture.
>>>>> That picture is of 2 glass coffee tables and a toaster in between.
>>>>> I see you can order that art om ebay. Item number 142657nottoday3245
>>>>> Regards
>>>>> Paul
>>>>> WB8TSL
>>>>>
>>>>> On Fri, Oct 31, 2014 at 1:36 PM, Jim Lux <jimlux at earthlink.net> wrote:
>>>>>
>>>>>   OK, I know you all want to go get one...
>>>>>>
>>>>>> http://discoverjpl.jpl.nasa.gov/posts/520
>>>>>>
>>>>>> It's Bob Tjoelker in front of the Deep Space Atomic Clock (DSAC) being
>>>>>> tested for magnetic field sensitivity.  It's a trapped ion clock, 1
>>>>>> liter/1
>>>>>> kg, orders and orders of magnitude better than a USO in performance.
>>>>>>
>>>>>> (if it's in the building I think it's in, the rebar is made of
>>>>>> non-magnetic stainless steel)
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>>>>>
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