Effects of sextupole time dependence on the LHC dynamic aperture

Author

Papaphilippou, Y. ; Schmidt, E. ; Zimmermann, E.

Author_Institution

CERN, Geneva, Switzerland

Volume

3

fYear

1999

fDate

1999

Firstpage

1560

Abstract

A primary concern regarding the LHC dynamic aperture is the time dependence of persistent-current sextupole fields in the superconducting magnets. Decaying slowly during injection, these fields are reinduced rapidly at the start of the acceleration (“snap-back”). If uncompensated, this snap-back would cause a chromaticity change by some 130 units. We investigate how this time dependence and the ramp rate affect the stability of particle motion and we evaluate the efficiency of different correction schemes

Keywords

accelerator magnets; colliding beam accelerators; particle beam dynamics; particle beam injection; particle beam stability; proton accelerators; superconducting magnets; synchrotrons; LHC dynamic aperture; chromaticity change; correction schemes; injection; particle motion stability; persistent-current sextupole fields; ramp rate; sextupole time dependence; superconducting magnets; time dependence; Acceleration; Apertures; Ear; Eddy currents; Large Hadron Collider; Magnetic fields; Particle tracking; Stability; Superconducting cables; Superconducting magnets;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.794173

Filename

794173