The sextupole magnets in the Low Energy Ring (LER) of PEP-II are grouped in pairs with a phase advance of 180 degrees. Displacing the magnets or moving the orbit to displace the beam in the magnets in an antisymmetric way creates a dispersion wave around the ring. This can be used to correct the vertical dispersion in LER without changing the local coupling. Results from simulations are shown.
@article{arxiv.physics/0008216,
title = {New Method of Dispersion Correction in the Pep-II Low Energy Ring},
author = {I. Reichel and Y. Cai},
journal= {arXiv preprint arXiv:physics/0008216},
year = {2007}
}