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