Title :
Effects of imperfections on the dynamic aperture and closed orbit of the IPNS Upgrade synchrotron
Author :
Lessner, E. ; Chae, Y.-C. ; Kim, S.
Author_Institution :
Argonne Nat. Lab., IL, USA
Abstract :
Magnet imperfections and misalignments are analyzed in terms of their effects on the dynamic aperture and closed orbit of the IPNS Upgrade synchrotron. The dynamic aperture is limited primarily by the presence of chromaticity-correcting sextupoles. With the sextupoles energized to the values required to adjust the chromaticities to zero, further reductions of the dynamic aperture caused by dipole strength and roll errors, quadrupole strength and alignment errors, and higher-order multipole errors are studied by tracking. Design specifications for the dipole corrector magnets are obtained and the dynamic aperture is studied before and after correction of the closed orbit. The use of harmonic-correcting sextupoles to reduce the amplitude-dependent tune shifts driven by the chromaticity-correcting sextupoles is investigated
Keywords :
accelerator magnets; electromagnets; particle beam dynamics; proton accelerators; synchrotrons; IPNS Upgrade synchrotron; alignment errors; amplitude-dependent tune shifts; chromaticity-correcting sextupoles; closed orbit; dipole corrector magnets; dipole strength; dynamic aperture; harmonic-correcting sextupoles; higher-order multipole errors; imperfections effects; misalignments; quadrupole strength; roll errors; Acceleration; Apertures; Electromagnetic scattering; Laboratories; Lattices; Magnetic analysis; Mirrors; Particle scattering; Protons; Synchrotrons;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.505701
