Hi Bill,
On 01/08/2012 06:55 PM, Bill Hawkins wrote:
Tom,
I had to look up "traveling clock synchronization" to get a
better understanding, and found this link:
http://www.newtonphysics.on.ca/einstein/chapter9.html
The idea that Qz (time on the quartz clock, no?) drops out in
the subtraction seems to me to require Qz to be invariant.
That seems beyond the capability of quartz at the required
error of one microsecond during the many hours that it will
take to transport Q between CERN and LNGS. Plenty of time
for cracks to propagate or chips fall off.
Why do you say we can ignore such effects?
Thanks for any enlightenment.
During the expected 12 hour drive the systematic effects and random
noise needs to be well contained, to reach the target of below 10 ns
effect. This calls for metrology grade cesiums or even hydrogen clocks.
We assume it does drift in phase, and that drift if indeed a concern in
order to achieve the goal.
A stop on the way to compare clocks is being considered.
Cheers,
Magnus
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