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

Volume

5

fYear

1995

fDate

1-5 May 1995

Firstpage

2811

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Conference_Location

Dallas, TX

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.505701

Filename

505701