Speaker
Description
In order to steer beams through the center of focusing elements, the field center
with respect to adjacent Beam Position Monitors needs to be known precisely.
Often individual qudrupoles are varied to find the center, where the orbit does
not change, but this requires costly field control for each quadrupole. Here we
analyze beam-based Alignment(BBA) techniques that utilizes sextupoles that
are powered in smaller families. These methods usually involve altering the
strength of a sextupole to find the center, where the tunes do not change. How-
ever, these approaches do not hold up well for sextupoles powered in families,
as changing the strength of one sextupole in a family also changes the strength
of every other family member. To reduce the effects of other sextupoles in the
same family, a new method was developed and investigated that involves creat-
ing a closed three-kicker-bump around a sextupole and observing the effects of
the sextupole field on the kick settings. By changing the position at which the
beam enters the sextupole by controlling the bump amplitude, one can recon-
struct the sextupole center. Here, we explore the precision to which this method
can reconstruct the sextupole center and we derive an error equation used to
explain the degree of precision expected from this method.
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