Try this: http://www.nature.com/news/flaws-found-in-faster-than-light-neutrino-measurement-1.10099
On Thu, Feb 23, 2012 at 2:10 AM, Magnus Danielson < mag...@rubidium.dyndns.org> wrote: > On 02/22/2012 11:26 PM, Poul-Henning Kamp wrote: > >> In message<9a458dba-3875-43b2-8383-5ca2f86be...@leapsecond.com>, "Tom >> Van Baak >> (lab)" writes: >> >> Could be on the electrical side of the adapter, not the optical >>> side. It's not impossible to get 60 ns of phase or trigger error >>> with RF connectors. >>> >> >> I don't buy that explanation. >> >> It's very hard to get 60 ns *consistent* phase or trigger error, >> with any kind of connector, almost no matter how you go about it. >> > > OTDR works just as normal TDR. If the fibre is not connected you get a > reflection and not enough transmission. This is what you use OTDRs for. > > I agree it needs more details to be believable. > > 20m of extra fiber sounds *much* more plausible. >> > > 60 ns is more like 12 m of fibre. SMF-28 has a refraction index of about > 1.45 depending on the wavelength of the laser. I use the rule of thumb that > 1 ns is 3 dm in free air and 2 dm in coax and fibre, it's usually good > enough for reality check calculations. Oh, and it's about 40 feet. > > Anyway, I would like to see much more detailed description to see that it > indeed was due to this error. Also I'd love to see it repeated such that > one can see the time error go "on" and "off". > > Inventing an excuse about a loose connector to cover up the mistake >> sounds even more plausible. >> >> You really don't want to defend your phd dissertation, being known >> as the idiot who made a fool of both CERN and SanGrasso in one go. >> > > This is science, making a spectacular error and then explain it in > painstakingly detail can teach a lot more than a otherwise uneventful day > at the lab, doing about the same measurement. > > Learning something means better prepared to avoid it next time. Experience > is being built. > > Still don't know what really happened here, rumours at the best. > > 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. > _______________________________________________ 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.