Hi Attila,
On 05/01/2012 06:47 PM, Attila Kinali wrote:
Moin,
For some time now, i'm wondering why the microwave cavity of Cs
beam standards is U shaped. Ie why does the Cs beam fly first
trough the first "sub"cavity, leaves it, flies a substantial
length trough free space, passes the second "sub"cavity and
then goes to the detector.
If the interaction time with the microwave field would be an
issue, i would expect the beam to pass trough a longer stretch
of the cavity, and not two time trough a short stretch that
are widely spaced.
Unfortunately, none of the papers i've read has shed any light
on this, and google isn't helpfull either.
Could anyone here enlighten me?
In combination with Tom's link to the Noble lecture, the U-shaped form
is really a bent transmission line such that the same source provides
the same signal. It's also important that the phase delay from the
source to both branches be very closely matched. Miss-align them and you
get a systematic frequency error as a result. Notice how the RF
interaction has the RF field being oriented orthogonally to the
direction of the beam.
Cheers,
Magnus
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