[time-nuts] The GPS velocity of light versus neutrinos

Magnus Danielson magnus at rubidium.dyndns.org
Wed Nov 23 16:52:48 EST 2011


On 11/22/2011 07:28 PM, Javier Serrano wrote:
> On Tue, Nov 22, 2011 at 3:17 PM, Bob Camp<lists at rtty.us>  wrote:
>
>>> in the first paper, the distance uncertainty was given as 20cm
>>
>>
>> Of which the survey likely contributed next to nothing and stuff like earth tides contributed the majority of the error ….
>
> See http://operaweb.lngs.infn.it/Opera/publicnotes/note132.pdf
> I think most of the uncertainty came from the non-GPS survey. They had
> to stop traffic in the highway (OPERA is in a cavern at an exit of the
> highway inside of a tunnel) but they could only close one lane. So
> bureaucracy is a more plausible answer :)

If the 20 cm uncertainty in position is insufficient, then redoing the 
survey is certainly an option. Using the 4 marks outside as reference 
and then using a couple of different surveying methods would certainly 
help. The LNGS laboratory is a bit of a challenge. It is the LNGS survey 
that contributes most of the uncertainty.

Still, even if surveying is being redone on both labs (which could be 
motivated by the interest in this find), is this where we expect to find 
the 18 meters missing?

Where did the 60 ns go? Uncompensated cables? Uncompensated equipment? 
Bias in detectors?

Recall, the installations on both ends are quite large ones. If you want 
to find the measurement error, go and check them. If you want to prove 
the result, check them. Waving theories and deny the result? Go and 
check them.

Cheers,
Magnus




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