[time-nuts] Fast than light neutrino

Magnus Danielson magnus at rubidium.dyndns.org
Sun Sep 25 08:07:45 UTC 2011


On 25/09/11 08:35, Javier Serrano wrote:
> On Sun, Sep 25, 2011 at 1:36 AM, Magnus Danielson<
> magnus at rubidium.dyndns.org>  wrote:
>
>>
>> I was about to ask for the specific papers of time calibrations, even if
>> the overview presentation indicates that the verification steps I expect to
>> be there have been done. Also the path calibrations needs to be described
>> more in detail than in the paper.
>>
>
> I'll discuss with Pablo to see how we can put more stuff on the web.
>
>
>>
>> First thought was that someone forgot to compensate for GPS antenna cable
>> delays.
>>
>
> We did not forget. The two GPS calibration campaigns (zero baseline and
> portable receiver) were done with antenna and antenna cable included.

I assumed so from the statements relating to time, in particular the PTB 
time transfer test proving a 2,3 ns difference. Which still doesn't 
satisfy my curiosity.

A 60 ns offset between the sites would account for the "missing time".
Similarly a 18 m shorter distance would also account for the "missing 
time". Due to the large distance I would start in that end to ensure it 
works.

This article puts focus into precission time-transfer between two sites.

>>
>> Do you have direct fiber between the locations?
>>
>
> You mean between CERN and Gran Sasso? No, but that's certainly something we
> could explore for the future.

A fiber-based time-transfer would be nice complementary as it would 
provide an independent timing path.

Cheers,
Magnus



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