Some Improvements of Closed Orbit Correction Methods Application to D.C.I.

On the occasion of DCI construction the question was advanced of possible improvements of usual methods concerning closed orbit correction. The calculations we expose here present two advantages : - The perturbations and corrections are not treated as pointlike dipoles, but inserted in lattice computation by their exactly corresponding transfer matrices. - The selection is not made among all possible correctors. A set of the statistically most efficient correctors is determined by a computational simulation.