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In order to Reduce radiation, a “notch” is made in
the beam
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early in the booster cycle.
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Currently, the extraction time is based on the
counted number
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of revolutions (RF buckets) of the Booster. This
ensures that
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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 it’s
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incompatible with multi-batch running (e.g.
Slipstacking or
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NuMI)
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We must be able to fix this total time so we can
synchronize to
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the M.I. orbit.
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This is called “beam cogging”.
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