METHOD AND APPARATUS FOR CONTROL OF COHERENT SYNCHROTRON RADIATION EFFECTS DURING RECIRCULATION WITH BUNCH COMPRESSION

摘要

A modulated-bending recirculating system that avoids CSR-driven breakdown in emittance compensation by redistributing the bending along the beamline. The modulated-bending recirculating system includes a) larger angles of bending in initial FODO cells, thereby enhancing the impact of CSR early on in the beam line while the bunch is long, and 2) a decreased bending angle in the final FODO cells, reducing the effect of CSR while the bunch is short. The invention describes a method for controlling the effects of CSR during recirculation and bunch compression including a) correcting chromatic aberrations, b) correcting lattice and CSR-induced curvature in the longitudinal phase space by compensating T566, and c) using lattice perturbations to compensate obvious linear correlations x-dp/p and x′-dp/p.

主权项

1. A modulated-bending recirculating system for a charged particle beam comprising:
a plurality of focusing and defocusing (FODO) cells arrayed in a recirculating arc including initial FODO cells and final FODO cells; each of said FODO cells including at least one dipole magnet and a quadrupole magnet; and said initial FODO cells include larger bend angles than the bend angles in said final FODO cells.