Orbit Correction

The closed orbit is based on all the dipole fields experienced, and also quadrupole and
sextupole if off-center through these.

http://www.desy.de/~sahoo/WebPage/Orbit%20Correction%20Basics.htm

The corrector-to-BPM response matrix is an vital piece of information for both orbit control and optics analysis. The response matrix can either be calculated (betafunction theory or numerical 'tracking' solutions) or measured directly on the accelerator. The basic format of the response matrix equation is

x = R theta

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