Ed,
On 10/25/2011 12:07 AM, ed breya wrote:
I am not familiar with the experiment, so I have to ask some dumb
questions:
First, I wonder how the "beam" is generated at the source, and then
detected at the receiving end, and how the launch and arrival events are
determined with high certainty in the first place. I assume the
neutrinos come from a nuclear or particle accelerator reaction, and are
produced either randomly or on demand. If they are random, then their
existence and direction must be detected as the start event, but if
produced on demand, then the start time is known and controlled. If the
latter is true, then maybe the beam itself can be modulated somehow to
carry some of the desired time and frequency information, or otherwise
help to improve the measurement. I assume that it must already be
controlled to some extent in time and amplitude in order to see an
effect above the background level at the detector.
Do read the article in question. You would love to see the graphs and
texts. It's quite readable.
The SPS produces 400 GeV/c protons which is extracted by a kicker magnet
in two 10,5 us long bursts, 50 ms apart. See page 4 of 1109.4897v1.
http://arxiv.org/abs/1109.4897
Contol is well timed with the Xli GPS receiver.
Cheers,
Magnus
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