On 24/09/11 18:15, Javier Serrano wrote:
On Fri, Sep 23, 2011 at 10:38 PM, Bill Dailey<docdai...@gmail.com> wrote:
The article is actually pretty fascinating regarding how it was all done.
Light can't go through rock (very far), neither can most other particles
(some farther than others). Neutrinos can pass through earth and the sun
unimpeded. It is neat apparently they set up a fiber optic link to test the
timing between the 2 locations (modeled the correct
Length).
Not quite. We used a traditional common view time transfer setup, using two
Septentrio PolaRx2e receivers and two CS4000 Cesium clocks. Then the signals
had to be sent from the GPS receiver locations to the extraction at CERN and
to the cavern in Opera, and we did have to take care of fiber delays.
More details here: http://dl.dropbox.com/u/13409775/cern-cal.pdf
And for reference, the general paper here: http://arxiv.org/abs/1109.4897
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.
First thought was that someone forgot to compensate for GPS antenna
cable delays.
Do you have direct fiber between the locations?
Cheers,
Magnus
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
