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In
order to Reduce radiation, a “notch” is made in the
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beam
early in the booster cycle.
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Currently,
the extraction time is based on the counted
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number
of revolutions (RF buckets) of the Booster.
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This
ensures that the notch is in the right place.
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The
actual time can vary by > 5 usec!
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This
is not a problem if booster sets the timing, but
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it’s
incompatible with multi-bunch running.
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We
must be able to fix this total time so we can
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synchronize
to the M.I. orbit.
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This
is called “beam cogging”.
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